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Benedetta M. Squeo
Istituto di Scienze e Tecnologie Chimiche (SCITEC), Consiglio Nazionale delle Ricerche, via Corti 12, 20133 Milano, Italy

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Short Biography

Benedetta Maria Squeo received her PhD in 2018 at the Chemistry and Biological Department of the University of Wuppertal (DE). She is a permanent reseacher of the Institute of Chemical Sciences and Technologies (SCITEC) in Milan. Her research activity is focused on the design and synthesis of conjugated organic materials for intelligent applications (organic/hybrid solar cells, OLEDs, sensors and bio-imaging) and in particular NIR-emitting and absorbing materials and conjugated polyelectrolytes soluble in water and alcohol.

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Journal article
Published: 02 February 2021 in Molecules
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Conjugated polymers with ionic pendant groups (CPEs) are receiving increasing attention as solution-processed interfacial materials for organic solar cells (OSCs). Various anionic CPEs have been successfully used, on top of ITO (Indium Tin Oxide) electrodes, as solution-processed anode interlayers (AILs) for conventional devices with direct geometry. However, the development of CPE AILs for OSC devices with inverted geometry is an important topic that still needs to be addressed. Here, we have designed three anionic CPEs bearing alkyl-potassium-sulfonate side chains. Their functional behavior as anode interlayers has been investigated in P3HT:PC61BM (poly(3-hexylthiophene): [6,6]-phenyl C61 butyric acid methyl ester) devices with an inverted geometry, using a hole collecting silver electrode evaporated on top. Our results reveal that to obtain effective anode modification, the CPEs’ conjugated backbone has to be tailored to grant self-doping and to have a good energy-level match with the photoactive layer. Furthermore, the sulfonate moieties not only ensure the solubility in polar orthogonal solvents, induce self-doping via a right choice of the conjugated backbone, but also play a role in the gaining of hole selectivity of the top silver electrode.

ACS Style

Elisa Lassi; Benedetta Squeo; Roberto Sorrentino; Guido Scavia; Simona Mrakic-Sposta; Maristella Gussoni; Barbara Vercelli; Francesco Galeotti; Mariacecilia Pasini; Silvia Luzzati. Sulfonate-Conjugated Polyelectrolytes as Anode Interfacial Layers in Inverted Organic Solar Cells. Molecules 2021, 26, 763 .

AMA Style

Elisa Lassi, Benedetta Squeo, Roberto Sorrentino, Guido Scavia, Simona Mrakic-Sposta, Maristella Gussoni, Barbara Vercelli, Francesco Galeotti, Mariacecilia Pasini, Silvia Luzzati. Sulfonate-Conjugated Polyelectrolytes as Anode Interfacial Layers in Inverted Organic Solar Cells. Molecules. 2021; 26 (3):763.

Chicago/Turabian Style

Elisa Lassi; Benedetta Squeo; Roberto Sorrentino; Guido Scavia; Simona Mrakic-Sposta; Maristella Gussoni; Barbara Vercelli; Francesco Galeotti; Mariacecilia Pasini; Silvia Luzzati. 2021. "Sulfonate-Conjugated Polyelectrolytes as Anode Interfacial Layers in Inverted Organic Solar Cells." Molecules 26, no. 3: 763.

Journal article
Published: 18 January 2021 in Electronic Materials
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A new organic material with three 4,4-difluoro-4-borata-3a-azonia-4a-aza-s-indacene dyes (BODIPYs) at the periphery of the central core is successfully synthesized (3BDP3T) and its corresponding aqueous nanoparticles are prepared via the encapsulation approach and characterized in detail both experimentally and theoretically with the aid of the Density Functional Theory (DFT). The linear and non-linear optical properties of the synthesized material are also studied. Until now, the development of organic materials with three BODIPYs as substituents is limited and their properties are not fully resolved. The obtained 3BDP3T-based nanoparticles exhibit far-red and near infrared (NIR) emission with photoluminescence quantum yields of 0.021, which is promising as a new fluorescent contrast agent in the far-red and NIR spectral regions.

ACS Style

Benedetta M. Squeo; Aggelos Avramopoulos; Alkmini D. Nega; Aristea Pavlou; Michael G. Siskos; Panagiota Koralli; Andriana Schiza; Antonia Dimitrakopoulou-Strauss; Vasilis G. Gregoriou; Christos L. Chochos. Far-Red to Near Infrared Emissive Aqueous Nanoparticles Based on a New Organic Material with Three BODIPY Dyes at the Periphery of the Core: A Combined Experimental and Theoretical Study. Electronic Materials 2021, 2, 24 -38.

AMA Style

Benedetta M. Squeo, Aggelos Avramopoulos, Alkmini D. Nega, Aristea Pavlou, Michael G. Siskos, Panagiota Koralli, Andriana Schiza, Antonia Dimitrakopoulou-Strauss, Vasilis G. Gregoriou, Christos L. Chochos. Far-Red to Near Infrared Emissive Aqueous Nanoparticles Based on a New Organic Material with Three BODIPY Dyes at the Periphery of the Core: A Combined Experimental and Theoretical Study. Electronic Materials. 2021; 2 (1):24-38.

Chicago/Turabian Style

Benedetta M. Squeo; Aggelos Avramopoulos; Alkmini D. Nega; Aristea Pavlou; Michael G. Siskos; Panagiota Koralli; Andriana Schiza; Antonia Dimitrakopoulou-Strauss; Vasilis G. Gregoriou; Christos L. Chochos. 2021. "Far-Red to Near Infrared Emissive Aqueous Nanoparticles Based on a New Organic Material with Three BODIPY Dyes at the Periphery of the Core: A Combined Experimental and Theoretical Study." Electronic Materials 2, no. 1: 24-38.

Review
Published: 31 December 2020 in Molecules
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The 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)-based molecules have emerged as interesting material for optoelectronic applications. The facile structural modification of BODIPY core provides an opportunity to fine-tune its photophysical and optoelectronic properties thanks to the presence of eight reactive sites which allows for the developing of a large number of functionalized derivatives for various applications. This review will focus on BODIPY application as solid-state active material in solar cells and in photonic devices. It has been divided into two sections dedicated to the two different applications. This review provides a concise and precise description of the experimental results, their interpretation as well as the conclusions that can be drawn. The main current research outcomes are summarized to guide the readers towards the full exploitation of the use of this material in optoelectronic applications.

ACS Style

Benedetta Maria Squeo; Lucia Ganzer; Tersilla Virgili; Mariacecilia Pasini. BODIPY-Based Molecules, A Platform for Photonic and Solar Cells. Molecules 2020, 26, 153 .

AMA Style

Benedetta Maria Squeo, Lucia Ganzer, Tersilla Virgili, Mariacecilia Pasini. BODIPY-Based Molecules, A Platform for Photonic and Solar Cells. Molecules. 2020; 26 (1):153.

Chicago/Turabian Style

Benedetta Maria Squeo; Lucia Ganzer; Tersilla Virgili; Mariacecilia Pasini. 2020. "BODIPY-Based Molecules, A Platform for Photonic and Solar Cells." Molecules 26, no. 1: 153.

Conference paper
Published: 14 November 2020 in Chemistry Proceedings
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In the last years, interfacial engineering has played a critical role in promoting the performance of optoelectronic devices as organic solar cells (OSC) and organic light-emitting diodes (OLEDs) since interfacial layers help to form an ohmic contact between the electrodes and the active layers, which is of great importance for charge collection/injection. Conjugated polyelectrolytes (CPEs), which are conjugated polymers bearing side-chain ionic functionalities such as anionic, cationic, or zwitterionic groups, have emerged as a new class of interfacial materials in thin film-based electronic devices thanks to their ability to reduce the barrier between electrode and active layer. In view of this, we designed and synthesized two novel low bandgap anionic copolymers with different anionic pendant groups and different conjugated backbones to obtain hole-transporting layer (HTL) materials as an alternative to commonly used poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate). The functional behavior of these copolymers as anode modifiers is herein preliminarily investigated in an OLED prototype.

ACS Style

Benedetta Maria Squeo; Wojciech Mróz; Umberto Giovanella; Mariacecilia Pasini. Anionic Low Band Gap-Conjugated Polyelectrolytes as Hole-Transporting Layer in Optoelectronics Devices. Chemistry Proceedings 2020, 3, 18 .

AMA Style

Benedetta Maria Squeo, Wojciech Mróz, Umberto Giovanella, Mariacecilia Pasini. Anionic Low Band Gap-Conjugated Polyelectrolytes as Hole-Transporting Layer in Optoelectronics Devices. Chemistry Proceedings. 2020; 3 (1):18.

Chicago/Turabian Style

Benedetta Maria Squeo; Wojciech Mróz; Umberto Giovanella; Mariacecilia Pasini. 2020. "Anionic Low Band Gap-Conjugated Polyelectrolytes as Hole-Transporting Layer in Optoelectronics Devices." Chemistry Proceedings 3, no. 1: 18.

Full paper
Published: 05 June 2019 in Macromolecular Chemistry and Physics
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Two branched oligophenylenethynylenes with phenylene or biphenylene moieties as inter‐nodal fragments are synthesized by the Sonogashira reaction for optoelectronic applications. The branching of polyphenylenethynylenes influences the electro‐optical properties, but cannot be precisely controlled, while its determination is often hardly addressed. The optical investigation, supported by nuclear magnetic resonance (NMR) studies, of oligophenylenethynylenes and the properly synthesized model compounds is performed to get insights on the branching and related effect on the material performance. The proposed branched oligophenylenethynylenes are good ultraviolet emitters in solution, while in solid‐state aggregation phenomena strongly affect emission properties. However, the interactions between π‐electrons on phenylene and ethynylene of neighboring molecules in films enhance intermolecular charge transport (hole mobility = 3.2 × 10−3 cm2 V−1s−1) making them optimal candidates as hole transport materials in optoelectronic devices. The insertion of the oligophenylenethynylene film as a hole transporting layer in multilayered solution processes blue, green, and red electroluminescent diodes, enhances OLEDs electro‐optical properties.

ACS Style

Wojciech Mroz; Aleksey I. Kovalev; Marina A. Babushkina‐Lebedeva; Natalia S. Kushakova; Barbara Vercelli; Benedetta Maria Squeo; Chiara Botta; Mariacecilia Pasini; Silvia Destri; Umberto Giovanella; Irina A. Khotina. Branched Oligophenylenes with Phenylene–Ethynylene Fragments as Anode Interfacial Layer for Solution Processed Optoelectronics. Macromolecular Chemistry and Physics 2019, 1 .

AMA Style

Wojciech Mroz, Aleksey I. Kovalev, Marina A. Babushkina‐Lebedeva, Natalia S. Kushakova, Barbara Vercelli, Benedetta Maria Squeo, Chiara Botta, Mariacecilia Pasini, Silvia Destri, Umberto Giovanella, Irina A. Khotina. Branched Oligophenylenes with Phenylene–Ethynylene Fragments as Anode Interfacial Layer for Solution Processed Optoelectronics. Macromolecular Chemistry and Physics. 2019; ():1.

Chicago/Turabian Style

Wojciech Mroz; Aleksey I. Kovalev; Marina A. Babushkina‐Lebedeva; Natalia S. Kushakova; Barbara Vercelli; Benedetta Maria Squeo; Chiara Botta; Mariacecilia Pasini; Silvia Destri; Umberto Giovanella; Irina A. Khotina. 2019. "Branched Oligophenylenes with Phenylene–Ethynylene Fragments as Anode Interfacial Layer for Solution Processed Optoelectronics." Macromolecular Chemistry and Physics , no. : 1.

Journal article
Published: 02 February 2019 in Pure and Applied Chemistry
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Polar semiconducting polymers based on a conjugated polymer backbone endowed with chemically anchored polar groups on the side chains have proved to be particularly interesting as optimization layer at organic/cathode interface in optoelectronic devices. In particular, the pendant phosphonate groups impart water-alcohol solubility allowing easy solution processing, and improve electron injection thanks to both a favorable interfacial dipole of phosphonate groups and an intense coordination interaction between the phosphonate groups and Al cathode. In this work we synthesize alternating fluorene-benzothiadiazole copolymers by proposing a post-polymerization reaction to insert the phosphonate groups. Thanks to this approach it is possible to use standard Suzuki coupling conditions, simplifying the process of synthesis, purification and characterization. The polymer Poly[9,9-bis(6′-diethoxylphosphorylhexyl)-alt-benzothiadiazole] (P2), is tested in conventional organic solar cells as cathode interfacial layers showing, with respect to the control device, an increasing of all the photovoltaic parameters, with a final power conversion efficiency that reaches 5.35% starting from 4.6%. The same trend is observed for multilayered polymer light-emitting diodes with an external quantum efficiency of the P2-based PLED enhanced of 1.5 times with respect to the basic devices with bare Al cathode, and negligible roll-off efficiency. The synergic effects of energy gap modulation and of polar phosphonated pendant functionalities of P2 are compared with the corresponding fluorene-based polar homopolymer. Our results show that, not only a proper selection of side functionalities, but also the tailoring of the energy gap of cathode interfacial materials (CIMs) is a possible effective strategy to engineer cathode of different optoelectronic devices and enhance their performance.

ACS Style

Benedetta Maria Squeo; Francesco Carulli; Elisa Lassi; Francesco Galeotti; Umberto Giovanella; Silvia Luzzati; Mariacecilia Pasini. Benzothiadiazole-based conjugated polyelectrolytes for interfacial engineering in optoelectronic devices. Pure and Applied Chemistry 2019, 91, 477 -488.

AMA Style

Benedetta Maria Squeo, Francesco Carulli, Elisa Lassi, Francesco Galeotti, Umberto Giovanella, Silvia Luzzati, Mariacecilia Pasini. Benzothiadiazole-based conjugated polyelectrolytes for interfacial engineering in optoelectronic devices. Pure and Applied Chemistry. 2019; 91 (3):477-488.

Chicago/Turabian Style

Benedetta Maria Squeo; Francesco Carulli; Elisa Lassi; Francesco Galeotti; Umberto Giovanella; Silvia Luzzati; Mariacecilia Pasini. 2019. "Benzothiadiazole-based conjugated polyelectrolytes for interfacial engineering in optoelectronic devices." Pure and Applied Chemistry 91, no. 3: 477-488.

Full paper
Published: 26 November 2018 in Macromolecular Chemistry and Physics
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A series of donor‐acceptor (D‐A) π‐conjugated polymers, based on indacenodithienothiophene (IDTT) as an electron‐donating unit and quinoxaline as an electron‐deficient moiety, are synthesized via a Pd‐catalyzed Stille cross‐coupling polymerization. Molecular characteristics, photovoltaic parameters, and optoelectronic properties are examined through structural differences corresponding to thienyl versus phenyl side group substitutions on the IDTT and the non‐fluorinated versus the monofluoro quinoxaline derivatives. One of the most important outcome is that the power conversion efficiency (PCE) in the studied polymers is more device architecture dependent (conventional vs inverted) rather than chemical structure dependent. From single junction solar cells based on bulk heterojunction polymer:[6,6]‐phenyl‐C71‐butyric acid methyl ester (PC71BM) systems as the active layer, a maximum PCE of 5.33% has been achieved from the polymer containing the thienyl substituent on the IDTT and one fluorine atom on the quinoxaline. This demonstrates that finding the optimum molecular weight of ThIDTT‐QF or introducing the monofluoro‐quinoxaline in a regioregular motif in the polymer backbone significantly higher PCE can be expected versus the fully optimized high performance PhIDTT‐Q conjugated polymer.

ACS Style

Elisavet Tatsi; Michael Spanos; Athanasios Katsouras; Benedetta M. Squeo; Olzhas A. Ibraikulov; Nicolas Zimmermann; Thomas Heiser; Patrick Lévêque; Vasilis G. Gregoriou; Apostolos Avgeropoulos; Nicolas Leclerc; Christos L. Chochos. Effect of Aryl Substituents and Fluorine Addition on the Optoelectronic Properties and Organic Solar Cell Performance of a High Efficiency Indacenodithienothiophene-alt -Quinoxaline π-Conjugated Polymer. Macromolecular Chemistry and Physics 2018, 220, 1 .

AMA Style

Elisavet Tatsi, Michael Spanos, Athanasios Katsouras, Benedetta M. Squeo, Olzhas A. Ibraikulov, Nicolas Zimmermann, Thomas Heiser, Patrick Lévêque, Vasilis G. Gregoriou, Apostolos Avgeropoulos, Nicolas Leclerc, Christos L. Chochos. Effect of Aryl Substituents and Fluorine Addition on the Optoelectronic Properties and Organic Solar Cell Performance of a High Efficiency Indacenodithienothiophene-alt -Quinoxaline π-Conjugated Polymer. Macromolecular Chemistry and Physics. 2018; 220 (2):1.

Chicago/Turabian Style

Elisavet Tatsi; Michael Spanos; Athanasios Katsouras; Benedetta M. Squeo; Olzhas A. Ibraikulov; Nicolas Zimmermann; Thomas Heiser; Patrick Lévêque; Vasilis G. Gregoriou; Apostolos Avgeropoulos; Nicolas Leclerc; Christos L. Chochos. 2018. "Effect of Aryl Substituents and Fluorine Addition on the Optoelectronic Properties and Organic Solar Cell Performance of a High Efficiency Indacenodithienothiophene-alt -Quinoxaline π-Conjugated Polymer." Macromolecular Chemistry and Physics 220, no. 2: 1.

Original article
Published: 04 April 2018 in Chemical Papers
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Interfacial engineering provides an important tool for optimizing the performances of optoelectronic devices. We show that poly[(2,7-(9,9′-dioctyl)fluorene)-alt-(2,7-(9,9′-bis(5″-trimethylammonium bromide)pentyl)fluorene)])], an alcohol-soluble π-conjugated polymer based on polyfluorene backbone and ammonium groups on the alkyl side chains, is capable of modifying the interface between the organic layer and the metal cathode in both organic solar cells and light-emitting diodes based on commercial materials and conventional architectures, improving their performances. The introduction of the cathode interlayer enhances the efficiency of a red-emitting phosphorescent OLED by 15% and decreases its turn-on voltage. The same polymer improves the power conversion efficiency of a PTB7/PC71BM solar cell by 55% and shows a beneficial effect in terms of device stability.

ACS Style

Francesco Carulli; Wojciech Mroz; Elisa Lassi; Cristina Sandionigi; Benedetta Maria Squeo; Lorenzo Meazza; Guido Scavia; Silvia Luzzati; Mariacecilia Pasini; Umberto Giovanella; Francesco Galeotti. Effect of the introduction of an alcohol-soluble conjugated polyelectrolyte as cathode interlayer in solution-processed organic light-emitting diodes and photovoltaic devices. Chemical Papers 2018, 72, 1753 -1759.

AMA Style

Francesco Carulli, Wojciech Mroz, Elisa Lassi, Cristina Sandionigi, Benedetta Maria Squeo, Lorenzo Meazza, Guido Scavia, Silvia Luzzati, Mariacecilia Pasini, Umberto Giovanella, Francesco Galeotti. Effect of the introduction of an alcohol-soluble conjugated polyelectrolyte as cathode interlayer in solution-processed organic light-emitting diodes and photovoltaic devices. Chemical Papers. 2018; 72 (7):1753-1759.

Chicago/Turabian Style

Francesco Carulli; Wojciech Mroz; Elisa Lassi; Cristina Sandionigi; Benedetta Maria Squeo; Lorenzo Meazza; Guido Scavia; Silvia Luzzati; Mariacecilia Pasini; Umberto Giovanella; Francesco Galeotti. 2018. "Effect of the introduction of an alcohol-soluble conjugated polyelectrolyte as cathode interlayer in solution-processed organic light-emitting diodes and photovoltaic devices." Chemical Papers 72, no. 7: 1753-1759.

Journals
Published: 27 February 2018 in Journal of Materials Chemistry C
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Development of new ultra low bandgap (Eoptg < 1 eV) π-conjugated D–A polymers consisting of α,β-unsubstituted meso-positioning thienyl BODIPY.

ACS Style

Benedetta M. Squeo; Vasilis G. Gregoriou; Yang Han; Alex Palma-Cando; Sybille Allard; Efthymis Serpetzoglou; Ioannis Konidakis; Emmanuel Stratakis; Apostolos Avgeropoulos; Thomas D. Anthopoulos; Martin Heeney; Ullrich Scherf; Christos L. Chochos. α,β-Unsubstituted meso-positioning thienyl BODIPY: a promising electron deficient building block for the development of near infrared (NIR) p-type donor–acceptor (D–A) conjugated polymers. Journal of Materials Chemistry C 2018, 6, 4030 -4040.

AMA Style

Benedetta M. Squeo, Vasilis G. Gregoriou, Yang Han, Alex Palma-Cando, Sybille Allard, Efthymis Serpetzoglou, Ioannis Konidakis, Emmanuel Stratakis, Apostolos Avgeropoulos, Thomas D. Anthopoulos, Martin Heeney, Ullrich Scherf, Christos L. Chochos. α,β-Unsubstituted meso-positioning thienyl BODIPY: a promising electron deficient building block for the development of near infrared (NIR) p-type donor–acceptor (D–A) conjugated polymers. Journal of Materials Chemistry C. 2018; 6 (15):4030-4040.

Chicago/Turabian Style

Benedetta M. Squeo; Vasilis G. Gregoriou; Yang Han; Alex Palma-Cando; Sybille Allard; Efthymis Serpetzoglou; Ioannis Konidakis; Emmanuel Stratakis; Apostolos Avgeropoulos; Thomas D. Anthopoulos; Martin Heeney; Ullrich Scherf; Christos L. Chochos. 2018. "α,β-Unsubstituted meso-positioning thienyl BODIPY: a promising electron deficient building block for the development of near infrared (NIR) p-type donor–acceptor (D–A) conjugated polymers." Journal of Materials Chemistry C 6, no. 15: 4030-4040.

Article
Published: 06 November 2017 in Journal of Polymer Science Part A: Polymer Chemistry
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The systematic optimization of the chemical structure of low-bandgap (LBG) donor-acceptor polymeric semiconductors is a challenging task for which accurate guidelines are yet to be determined. Several different structural and molecular parameters are crucial ingredients for obtaining LBG polymers that simultaneously possess high power conversion efficiencies, good processability in common organic solvents, and enhanced stability in organic photovoltaic devices. In this work, we present an extensive structure–optoelectronic properties–solar cell performance study on the emerging class of diketopyrrolopyrrole-based LBG polymers. In particular, we investigate alkyl side chain positioning by introducing linear alkyl side chains into two different positions (α- and β-), and the distance of the electron rich and electron deficient monomers within the repeat units of the polymer chain. We demonstrate that anchoring linear alkyl side chains to the α-positions and introducing fused moieties into the polymer backbone, can be beneficial toward maintaining photocurrents similar to the unsubstituted derivative, and concurrently exhibit better processabiliy in common organic solvents. These results can provide a design rationale towards further optimization of semiconducting polymers. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 138–146

ACS Style

Christos L. Chochos; Athanasios Katsouras; Sofia Drakopoulou; Christina Miskaki; Miron Krassas; Pavlos Tzourmpakis; George Kakavelakis; Christian Sprau; Alexander Colsmann; Benedetta M. Squeo; Vasilis G. Gregoriou; Emmanuel Kymakis; Apostolos Avgeropoulos. Effects of alkyl side chains positioning and presence of fused aromatic units in the backbone of low-bandgap diketopyrrolopyrrole copolymers on the optoelectronic properties of organic solar cells. Journal of Polymer Science Part A: Polymer Chemistry 2017, 56, 138 -146.

AMA Style

Christos L. Chochos, Athanasios Katsouras, Sofia Drakopoulou, Christina Miskaki, Miron Krassas, Pavlos Tzourmpakis, George Kakavelakis, Christian Sprau, Alexander Colsmann, Benedetta M. Squeo, Vasilis G. Gregoriou, Emmanuel Kymakis, Apostolos Avgeropoulos. Effects of alkyl side chains positioning and presence of fused aromatic units in the backbone of low-bandgap diketopyrrolopyrrole copolymers on the optoelectronic properties of organic solar cells. Journal of Polymer Science Part A: Polymer Chemistry. 2017; 56 (1):138-146.

Chicago/Turabian Style

Christos L. Chochos; Athanasios Katsouras; Sofia Drakopoulou; Christina Miskaki; Miron Krassas; Pavlos Tzourmpakis; George Kakavelakis; Christian Sprau; Alexander Colsmann; Benedetta M. Squeo; Vasilis G. Gregoriou; Emmanuel Kymakis; Apostolos Avgeropoulos. 2017. "Effects of alkyl side chains positioning and presence of fused aromatic units in the backbone of low-bandgap diketopyrrolopyrrole copolymers on the optoelectronic properties of organic solar cells." Journal of Polymer Science Part A: Polymer Chemistry 56, no. 1: 138-146.

Journal article
Published: 01 August 2017 in Progress in Polymer Science
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ACS Style

Benedetta M. Squeo; Vasilis G. Gregoriou; Apostolos Avgeropoulos; Sebnem Baysec; Sybille Allard; Ullrich Scherf; Christos L. Chochos. BODIPY-based polymeric dyes as emerging horizon materials for biological sensing and organic electronic applications. Progress in Polymer Science 2017, 71, 26 -52.

AMA Style

Benedetta M. Squeo, Vasilis G. Gregoriou, Apostolos Avgeropoulos, Sebnem Baysec, Sybille Allard, Ullrich Scherf, Christos L. Chochos. BODIPY-based polymeric dyes as emerging horizon materials for biological sensing and organic electronic applications. Progress in Polymer Science. 2017; 71 ():26-52.

Chicago/Turabian Style

Benedetta M. Squeo; Vasilis G. Gregoriou; Apostolos Avgeropoulos; Sebnem Baysec; Sybille Allard; Ullrich Scherf; Christos L. Chochos. 2017. "BODIPY-based polymeric dyes as emerging horizon materials for biological sensing and organic electronic applications." Progress in Polymer Science 71, no. : 26-52.

Journal article
Published: 09 May 2017 in Scientific Reports
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We take advantage of a recent breakthrough in the synthesis of α,β-unfunctionalised 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) moieties, which we symmetrically conjugate with oligothienyls in an unexpectedly stable form, and produce a “metal-free” A-D-A (acceptor-donor-acceptor) oligomer emitting in the near-infrared (NIR) thanks to delocalisation of the BODIPY low-lying lowest unoccupied molecular orbital (LUMO) over the oligothienyl moieties, as confirmed by density functional theory (DFT). We are able to retain a PL efficiency of 20% in the solid state (vs. 30% in dilute solutions) by incorporating such a dye in a wider gap polyfluorene matrix and demonstrate organic light-emitting diodes (OLEDs) emitting at 720 nm. We achieve external quantum efficiencies (EQEs) up to 1.1%, the highest value achieved so far by a “metal-free” NIR-OLED not intentionally benefitting from triplet-triplet annihilation. Our work demonstrates for the first time the promise of A-D-A type dyes for NIR OLEDs applications thereby paving the way for further optimisation.

ACS Style

Andrea Zampetti; Alessandro Minotto; Benedetta Maria Squeo; Vasilis G. Gregoriou; Sybille Allard; Ullrich Scherf; Christos L. Chochos; Franco Cacialli. Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties. Scientific Reports 2017, 7, 1 -7.

AMA Style

Andrea Zampetti, Alessandro Minotto, Benedetta Maria Squeo, Vasilis G. Gregoriou, Sybille Allard, Ullrich Scherf, Christos L. Chochos, Franco Cacialli. Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties. Scientific Reports. 2017; 7 (1):1-7.

Chicago/Turabian Style

Andrea Zampetti; Alessandro Minotto; Benedetta Maria Squeo; Vasilis G. Gregoriou; Sybille Allard; Ullrich Scherf; Christos L. Chochos; Franco Cacialli. 2017. "Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties." Scientific Reports 7, no. 1: 1-7.

Article
Published: 13 February 2017 in Macromolecular Rapid Communications
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ACS Style

Christos L. Chochos; Sofia Drakopoulou; Athanasios Katsouras; Benedetta M. Squeo; Christian Sprau; Alexander Colsmann; Vasilis G. Gregoriou; Alex-Palma Cando; Sybille Allard; Ullrich Scherf; Nicola Gasparini; Negar Kazerouni; Tayebeh Ameri; Christoph J. Brabec; Apostolos Avgeropoulos. Beyond Donor-Acceptor (D-A) Approach: Structure-Optoelectronic Properties-Organic Photovoltaic Performance Correlation in New D-A1-D-A2Low-Bandgap Conjugated Polymers. Macromolecular Rapid Communications 2017, 38, 1 .

AMA Style

Christos L. Chochos, Sofia Drakopoulou, Athanasios Katsouras, Benedetta M. Squeo, Christian Sprau, Alexander Colsmann, Vasilis G. Gregoriou, Alex-Palma Cando, Sybille Allard, Ullrich Scherf, Nicola Gasparini, Negar Kazerouni, Tayebeh Ameri, Christoph J. Brabec, Apostolos Avgeropoulos. Beyond Donor-Acceptor (D-A) Approach: Structure-Optoelectronic Properties-Organic Photovoltaic Performance Correlation in New D-A1-D-A2Low-Bandgap Conjugated Polymers. Macromolecular Rapid Communications. 2017; 38 (7):1.

Chicago/Turabian Style

Christos L. Chochos; Sofia Drakopoulou; Athanasios Katsouras; Benedetta M. Squeo; Christian Sprau; Alexander Colsmann; Vasilis G. Gregoriou; Alex-Palma Cando; Sybille Allard; Ullrich Scherf; Nicola Gasparini; Negar Kazerouni; Tayebeh Ameri; Christoph J. Brabec; Apostolos Avgeropoulos. 2017. "Beyond Donor-Acceptor (D-A) Approach: Structure-Optoelectronic Properties-Organic Photovoltaic Performance Correlation in New D-A1-D-A2Low-Bandgap Conjugated Polymers." Macromolecular Rapid Communications 38, no. 7: 1.

Journals
Published: 13 July 2015 in Journal of Materials Chemistry A
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NIR absorbing copolymers based on α,β-unsubstituted BODIPY dyes suitable for NIR organic photovoltaics.

ACS Style

Benedetta M. Squeo; Nicola Gasparini; Tayebeh Ameri; Alex Palma-Cando; Sybille Allard; Vasilis G. Gregoriou; Christoph J. Brabec; Ullrich Scherf; Christos L. Chochos. Ultra low band gap α,β-unsubstituted BODIPY-based copolymer synthesized by palladium catalyzed cross-coupling polymerization for near infrared organic photovoltaics. Journal of Materials Chemistry A 2015, 3, 16279 -16286.

AMA Style

Benedetta M. Squeo, Nicola Gasparini, Tayebeh Ameri, Alex Palma-Cando, Sybille Allard, Vasilis G. Gregoriou, Christoph J. Brabec, Ullrich Scherf, Christos L. Chochos. Ultra low band gap α,β-unsubstituted BODIPY-based copolymer synthesized by palladium catalyzed cross-coupling polymerization for near infrared organic photovoltaics. Journal of Materials Chemistry A. 2015; 3 (31):16279-16286.

Chicago/Turabian Style

Benedetta M. Squeo; Nicola Gasparini; Tayebeh Ameri; Alex Palma-Cando; Sybille Allard; Vasilis G. Gregoriou; Christoph J. Brabec; Ullrich Scherf; Christos L. Chochos. 2015. "Ultra low band gap α,β-unsubstituted BODIPY-based copolymer synthesized by palladium catalyzed cross-coupling polymerization for near infrared organic photovoltaics." Journal of Materials Chemistry A 3, no. 31: 16279-16286.