This page has only limited features, please log in for full access.

Unclaimed
Killian Lobato
Instituto Dom Luiz (IDL), Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1600-276 Lisboa, Portugal

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 13 July 2020 in Applied Sciences
Reads 0
Downloads 0

The 2030 Agenda for Sustainable Development set 17 Sustainable Development Goals (SDGs). These include ensuring access to affordable, reliable, sustainable and modern energy for all (SGD7) and making cities and human settlements inclusive, safe, resilient and sustainable (SGD11). Thus, across the globe, major cities are moving in the smart city direction, by, for example, incorporating photovoltaics (PV), electric buses and sensors to improve public transportation. We study the concept of integrated PV bus stop shelters for the city of Lisbon. We identified the suitable locations for these, with respect to solar exposure, by using a Geographic Information System (GIS) solar radiation map. Then, using proxies to describe tourist and commuter demand, we determined that 54% of all current city bus stop shelters have the potential to receive PV-based solutions. Promoting innovative solutions such as this one will support smart mobility and urban sustainability while increasing quality of life, the ultimate goal of the Smart Cities movement.

ACS Style

Teresa Santos; Killian Lobato; Jorge Rocha; José Tenedório. Modeling Photovoltaic Potential for Bus Shelters on a City-Scale: A Case Study in Lisbon. Applied Sciences 2020, 10, 4801 .

AMA Style

Teresa Santos, Killian Lobato, Jorge Rocha, José Tenedório. Modeling Photovoltaic Potential for Bus Shelters on a City-Scale: A Case Study in Lisbon. Applied Sciences. 2020; 10 (14):4801.

Chicago/Turabian Style

Teresa Santos; Killian Lobato; Jorge Rocha; José Tenedório. 2020. "Modeling Photovoltaic Potential for Bus Shelters on a City-Scale: A Case Study in Lisbon." Applied Sciences 10, no. 14: 4801.

Review article
Published: 29 May 2019 in Chemical Engineering Journal
Reads 0
Downloads 0

The growing field of supercapacitors has already gained enough maturity and complexity to be the object of highly specific reviews. This review aims to provide a comprehensive outline of the topic, by presenting the state-of-the-art electrolytes and electrode materials used in supercapacitors as well as the relationship between their intrinsic features and their key performance indicators. This analysis is complemented by numerous examples of recent literature-reported performances of hybrid supercapacitors. To aid comparison, these are listed in tables and shown in plots, organized by type of electrode material and by type of electrolyte. Finally, performance differences between lab scale and commercial scale devices are put in perspective, by exploring, on one hand, the obstacles to the transition from promising lab scale to industrial scale devices and by explaining, on the other hand, the reasons why the same type of electrode material and electrolyte combination often perform more poorly in real-world devices. With this approach, the authors expect to give a useful insight (and a comprehensive snapshot) into the challenges that need to be surpassed to bridge the gap between lab scale and industrial scale devices.

ACS Style

Joana Monteiro Baptista; Jagdeep S. Sagu; Upul Wijayantha Kg; Killian Lobato. State-of-the-art materials for high power and high energy supercapacitors: Performance metrics and obstacles for the transition from lab to industrial scale – A critical approach. Chemical Engineering Journal 2019, 374, 1153 -1179.

AMA Style

Joana Monteiro Baptista, Jagdeep S. Sagu, Upul Wijayantha Kg, Killian Lobato. State-of-the-art materials for high power and high energy supercapacitors: Performance metrics and obstacles for the transition from lab to industrial scale – A critical approach. Chemical Engineering Journal. 2019; 374 ():1153-1179.

Chicago/Turabian Style

Joana Monteiro Baptista; Jagdeep S. Sagu; Upul Wijayantha Kg; Killian Lobato. 2019. "State-of-the-art materials for high power and high energy supercapacitors: Performance metrics and obstacles for the transition from lab to industrial scale – A critical approach." Chemical Engineering Journal 374, no. : 1153-1179.

Chapter
Published: 08 February 2019 in Perspectives on Fluorescence
Reads 0
Downloads 0

This chapter reviews the applications of luminescence-based techniques in the photovoltaic industry, with special focus on crystalline silicon-based devices – the dominant technology in the market. Section 1 introduces the principles of the photovoltaic effect and describes the light capture and conversion in the device. A brief description of the state-of-the-art device manufacture is then given along with a description of how power conversion efficiency of photovoltaic devices is determined. Section 2 describes the origin of luminescence in photovoltaic devices and also describes the luminescence-based characterization of photovoltaic cells and modules. Section 3 describes in detail how luminescence (photo- and electroluminescence) measurements are applied in the complete value chain of the PV industry, from ingot, to wafer, to device, to module, to complete infield systems. Section 4 briefly describes how luminescence is also relevant for emerging thin-film photovoltaic technologies. Section 5 describes a recently developed technique, reverse bias electroluminescence, where the photovoltaic devices are inversely polarized. The emitted photons here are a result of charge carrier acceleration and consequent scattering and/or recombination in a high electric field. Section 6 concludes this chapter with an outlook on how luminescence imaging is expected to develop in the near future, namely, how currently under development lab techniques will likely be transferred to the industrial environment.

ACS Style

José Almeida Silva; Joao Serra; António Manuel Vallêra; Killian Lobato. Luminescence in Photovoltaics. Perspectives on Fluorescence 2019, 173 -211.

AMA Style

José Almeida Silva, Joao Serra, António Manuel Vallêra, Killian Lobato. Luminescence in Photovoltaics. Perspectives on Fluorescence. 2019; ():173-211.

Chicago/Turabian Style

José Almeida Silva; Joao Serra; António Manuel Vallêra; Killian Lobato. 2019. "Luminescence in Photovoltaics." Perspectives on Fluorescence , no. : 173-211.

Original paper
Published: 12 May 2018 in Journal of Solid State Electrochemistry
Reads 0
Downloads 0

Water plays an important role in N719 sensitization of ZnO films for application as photoanodes in DSC devices. The role of water content in ethanolic N719 sensitization solutions was examined resorting to N719-solvent interaction studies based on Kamlet-Taft solvatochromic parameters. Results show that as the water content increases, solvent’s HBA ability decreases, hindering dye aggregation in solution and increasing the fraction of dye carboxylic groups available for anchorage onto the charged ZnO surface. The impact of dye-dye-solvent equilibria in solution on ZnO nanorod films sensitization and device behavior was evaluated. Devices assembled with films sensitized in N719 solutions containing equal parts of ethanol and water showed a twofold increase in short-circuit current densities when compared to those sensitized in ethanol only, despite exhibiting significantly less stained films. Data indicate that the presence of water in the sensitization solution reduces the amount of dye aggregates in solution and on the ZnO surface.

ACS Style

Daniel Siopa; Ricardo Nunes; Filomena Martins; Maria Santos; Killian Lobato; Anabela Gomes. The role of ethanol-water solvent mixtures in N719 sensitization of electrodeposited ZnO nanorods. Journal of Solid State Electrochemistry 2018, 22, 2779 -2787.

AMA Style

Daniel Siopa, Ricardo Nunes, Filomena Martins, Maria Santos, Killian Lobato, Anabela Gomes. The role of ethanol-water solvent mixtures in N719 sensitization of electrodeposited ZnO nanorods. Journal of Solid State Electrochemistry. 2018; 22 (9):2779-2787.

Chicago/Turabian Style

Daniel Siopa; Ricardo Nunes; Filomena Martins; Maria Santos; Killian Lobato; Anabela Gomes. 2018. "The role of ethanol-water solvent mixtures in N719 sensitization of electrodeposited ZnO nanorods." Journal of Solid State Electrochemistry 22, no. 9: 2779-2787.

Journal article
Published: 01 March 2017 in Measurement
Reads 0
Downloads 0
ACS Style

M. Frazão; José Silva; Killian Lobato; Joao Serra. Electroluminescence of silicon solar cells using a consumer grade digital camera. Measurement 2017, 99, 7 -12.

AMA Style

M. Frazão, José Silva, Killian Lobato, Joao Serra. Electroluminescence of silicon solar cells using a consumer grade digital camera. Measurement. 2017; 99 ():7-12.

Chicago/Turabian Style

M. Frazão; José Silva; Killian Lobato; Joao Serra. 2017. "Electroluminescence of silicon solar cells using a consumer grade digital camera." Measurement 99, no. : 7-12.

Journal article
Published: 01 November 2016 in Materials & Design
Reads 0
Downloads 0

Highlights•First report on the use of a TiO2 intermediate layer for the growth n-type ZnO nanorod arrays by pulsed electrodeposition.•Importantly, films are compared to those grown without a TiO2 intermediate layer but with the same ZnO seed layer.•In this case results show that nanorod density increases 3-fold to ~ 165μm− 2 and nanorod diameter decreases by 50% to ~ 40nm.•Results also show that green intra-bandgap photoluminescence emission is suppressed indicating enhanced crystalline quality. AbstractZinc oxide nanorod (ZnO NR) films for photocatalytic and energy conversion applications were synthesized by pulsed electrodeposition. The films were prepared on modified fluorine-doped tin oxide (FTO) glass coated with thin layers of ZnO seeds and porous anatase titanium dioxide (TiO2). The ZnO seed layers were prepared electrochemically, whilst the TiO2 layers by spin-coating. Morphological and structural analysis of the films reveal the effect of the TiO2 intermediate layers on ZnO NRs was to improve vertical alignment, increase spatial density and decrease diameter.Room temperature photoluminescence (PL) results show that the ZnO NRs exhibit near band edge recombination and deep level emission in the green and red spectral regions. The green emission was almost suppressed for ZnO NRs grown using the TiO2 intermediate layer followed by two step electrodeposition of ZnO.The prepared films demonstrated photoelectrochemical behaviour in aqueous electrolytes. Additionally, the ZnO NRs prepared with a TiO2 intermediate layer demonstrated increased stability to photo-dissolution. Graphical abstract

ACS Style

Tania Frade; Killian Lobato; José F.C. Carreira; Joana Rodrigues; Teresa Monteiro; Anabela Gomes. TiO2 anatase intermediary layer acting as template for ZnO pulsed electrodeposition. Materials & Design 2016, 110, 18 -26.

AMA Style

Tania Frade, Killian Lobato, José F.C. Carreira, Joana Rodrigues, Teresa Monteiro, Anabela Gomes. TiO2 anatase intermediary layer acting as template for ZnO pulsed electrodeposition. Materials & Design. 2016; 110 ():18-26.

Chicago/Turabian Style

Tania Frade; Killian Lobato; José F.C. Carreira; Joana Rodrigues; Teresa Monteiro; Anabela Gomes. 2016. "TiO2 anatase intermediary layer acting as template for ZnO pulsed electrodeposition." Materials & Design 110, no. : 18-26.

Journal article
Published: 01 September 2015 in Journal of Photochemistry and Photobiology A: Chemistry
Reads 0
Downloads 0
ACS Style

Érica Torres; Sara Sequeira; Pedro Parreira; Paulo Mendes; Tiago Silva; Killian Lobato; Maria Brites. Coumarin dye with ethynyl group as π-spacer unit for dye sensitized solar cells. Journal of Photochemistry and Photobiology A: Chemistry 2015, 310, 1 -8.

AMA Style

Érica Torres, Sara Sequeira, Pedro Parreira, Paulo Mendes, Tiago Silva, Killian Lobato, Maria Brites. Coumarin dye with ethynyl group as π-spacer unit for dye sensitized solar cells. Journal of Photochemistry and Photobiology A: Chemistry. 2015; 310 ():1-8.

Chicago/Turabian Style

Érica Torres; Sara Sequeira; Pedro Parreira; Paulo Mendes; Tiago Silva; Killian Lobato; Maria Brites. 2015. "Coumarin dye with ethynyl group as π-spacer unit for dye sensitized solar cells." Journal of Photochemistry and Photobiology A: Chemistry 310, no. : 1-8.

Journal article
Published: 01 September 2014 in Renewable and Sustainable Energy Reviews
Reads 0
Downloads 0
ACS Style

Miguel Centeno Brito; Killian Lobato; Pedro Nunes; Filipe Serra. Sustainable energy systems in an imaginary island. Renewable and Sustainable Energy Reviews 2014, 37, 229 -242.

AMA Style

Miguel Centeno Brito, Killian Lobato, Pedro Nunes, Filipe Serra. Sustainable energy systems in an imaginary island. Renewable and Sustainable Energy Reviews. 2014; 37 ():229-242.

Chicago/Turabian Style

Miguel Centeno Brito; Killian Lobato; Pedro Nunes; Filipe Serra. 2014. "Sustainable energy systems in an imaginary island." Renewable and Sustainable Energy Reviews 37, no. : 229-242.

Conference paper
Published: 01 June 2013 in 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC)
Reads 0
Downloads 0

The decrease in wafer thickness seen as a route to cost reductions has raised a growing interest in techniques that allow the preparation of thin wafers without kerf loss. The Slim-cut process [1] is one of these new techniques and comprises mainly three stages: a stress layer deposition step on the top of a monocrystalline silicon sample, a heating step necessary to induce the stress on the silicon sample and detach a thin silicon layer, and a third step to clean the stress-inducing layer to obtain a silicon foil adapted to the fabrication of solar cells. One of the major problems of this technology consists in finding a stress layer that induces a sufficiently high contraction in order to achieve a rupture of the silicon without contamination of the foil. In this work we present a comparison between thin foils obtained by Slim-cut, using three different stress layers: i) a double screen printed Silver/Aluminum layer, ii) a dispensed epoxy paste, iii) an electrodeposited Nickel metallization. Results on lifetime measurements indicate that some of the stress layers, although capable of inducing large stress, severely degrade lifetime of the foil.

ACS Style

Joao Serra; P. Bellanger; K. Lobato; R. Martini; Maarten Debucquoy; J. Poortmans. Comparative study of stress inducing layers to produce kerfless thin wafers by the Slim-cut technique. 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC) 2013, 0177 -0180.

AMA Style

Joao Serra, P. Bellanger, K. Lobato, R. Martini, Maarten Debucquoy, J. Poortmans. Comparative study of stress inducing layers to produce kerfless thin wafers by the Slim-cut technique. 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC). 2013; ():0177-0180.

Chicago/Turabian Style

Joao Serra; P. Bellanger; K. Lobato; R. Martini; Maarten Debucquoy; J. Poortmans. 2013. "Comparative study of stress inducing layers to produce kerfless thin wafers by the Slim-cut technique." 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC) , no. : 0177-0180.

Journal article
Published: 01 January 2013 in ECS Electrochemistry Letters
Reads 0
Downloads 0

Semiconducting ZnO nanostructured films on fluorine doped tin oxide coated glass with good crystallographic properties were prepared via electrodeposition at room temperature in a zinc nitrate electroplating bath for three current densities, i, (50 < i< 160 μAcm−2). The morphology and crystallography of the films depended on the electroplating current density. The morphology of the films ranged from flower to fuzzy-spherical structures and the overall diameter of these was of the micron scale. The as grown films demonstrated preferential growth of the (002) plane.

ACS Style

M. Wadowska; Tania Frade; Daniel Siopa; Killian Lobato; Anabela Gomes. ZnO Nanostructured Films Electrodeposited at Room Temperature. ECS Electrochemistry Letters 2013, 2, D40 -D42.

AMA Style

M. Wadowska, Tania Frade, Daniel Siopa, Killian Lobato, Anabela Gomes. ZnO Nanostructured Films Electrodeposited at Room Temperature. ECS Electrochemistry Letters. 2013; 2 (7):D40-D42.

Chicago/Turabian Style

M. Wadowska; Tania Frade; Daniel Siopa; Killian Lobato; Anabela Gomes. 2013. "ZnO Nanostructured Films Electrodeposited at Room Temperature." ECS Electrochemistry Letters 2, no. 7: D40-D42.

Original paper
Published: 16 December 2011 in Journal of Solid State Electrochemistry
Reads 0
Downloads 0

Ti/Zn-TiO2 electrodes were successfully prepared by the co-deposition method, on a titanium substrate, using an acidic zinc sulphate solution with TiO2 nanoparticles in suspension. After electrodeposition, samples were heated in air at 450 °C for 6 h. The X-ray diffraction analysis of the deposits point to the metal matrix modification from Zn to ZnO. In addition, the scanning electron microscopy results indicate that the films have a high surface area with a rich morphology, due to the appearance of ZnO needle-shaped grains. The voltammograms recorded, in Na2SO4 solution, for these electrodes under illumination at λ = 365 nm confirmed the films photoactivity. Photoelectrochemical degradation of Ibuprofen (Ibu) was achieved with the Zn-TiO2 electrodes after thermal treatment. UV–Vis spectrometry, high-performance liquid chromatography (HPLC), chemical oxygen demand (COD) and total organic carbon (TOC) measurements were performed and data demonstrated that Ibuprofen was efficiently degraded. Absorbance at 220 nm, COD and TOC removals of 35%, 34% and 23%, respectively, were obtained after a 3 h period.

ACS Style

A. Gomes; Tania Frade; Killian Lobato; Maria Melo Jorge; Maria Isabel Da Silva Pereira; Lurdes Ciríaco; Ana Lopes. Annealed Ti/Zn-TiO2 nanocomposites tested as photoanodes for the degradation of Ibuprofen. Journal of Solid State Electrochemistry 2011, 16, 2061 -2069.

AMA Style

A. Gomes, Tania Frade, Killian Lobato, Maria Melo Jorge, Maria Isabel Da Silva Pereira, Lurdes Ciríaco, Ana Lopes. Annealed Ti/Zn-TiO2 nanocomposites tested as photoanodes for the degradation of Ibuprofen. Journal of Solid State Electrochemistry. 2011; 16 (6):2061-2069.

Chicago/Turabian Style

A. Gomes; Tania Frade; Killian Lobato; Maria Melo Jorge; Maria Isabel Da Silva Pereira; Lurdes Ciríaco; Ana Lopes. 2011. "Annealed Ti/Zn-TiO2 nanocomposites tested as photoanodes for the degradation of Ibuprofen." Journal of Solid State Electrochemistry 16, no. 6: 2061-2069.

Journal article
Published: 19 December 2007 in CHIMIA International Journal for Chemistry
Reads 0
Downloads 0

The time varying photocurrent response of dye-sensitized solar cells to switching on illumination and then switching the illumination off after steady state has been reached has been measured and modeled with a multiscale Monte Carlo and continuum approaches within the multiple trapping picture, where electrons in the porous TiO2 electrodes undergo successive trapping and detrapping events. These models are more detailed than the more common formalism employing an effective diffusion coefficient as they take into account the large variation in conduction electron density with distance and time near the extracting electrodes. Agreement between the three sets of results using a trap concentration and trap energy distribution width from a separate set of measurements using charge extraction shows that the multiple trapping formalism holds.

ACS Style

Alison B. Walker; L. M. Peter; D. Martínez; Killian Lobato. Transient Photocurrents in Dye-Sensitized Nanocrystalline Solar Cells. CHIMIA International Journal for Chemistry 2007, 61, 792 -795.

AMA Style

Alison B. Walker, L. M. Peter, D. Martínez, Killian Lobato. Transient Photocurrents in Dye-Sensitized Nanocrystalline Solar Cells. CHIMIA International Journal for Chemistry. 2007; 61 (12):792-795.

Chicago/Turabian Style

Alison B. Walker; L. M. Peter; D. Martínez; Killian Lobato. 2007. "Transient Photocurrents in Dye-Sensitized Nanocrystalline Solar Cells." CHIMIA International Journal for Chemistry 61, no. 12: 792-795.

Research article
Published: 21 October 2006 in The Journal of Physical Chemistry B
Reads 0
Downloads 0

It is shown that application of the so-called quasi-static approximation greatly simplifies the theoretical treatment of the open circuit photovoltage decay of dye-sensitized nanostructured solar cells (DSCs), since it removes the need to treat the kinetics of trapping and detrapping explicitly and leads to a straightforward analytical solution in the case of an exponential trap distribution. To identify the conditions under which the quasi-static approach is valid, transients calculated using the quasi-static approximation are compared with the results of numerical calculations that treat trapping and detrapping of electrons explicitly. The application of the quasi-static approach to derive the rate constant for the back-reaction of electrons from experimental photovoltage decay data is illustrated for an optimized DSC.

ACS Style

Alison B. Walker; Laurence Peter; Killian Lobato; P.J. Cameron. Analysis of Photovoltage Decay Transients in Dye-Sensitized Solar Cells†. The Journal of Physical Chemistry B 2006, 110, 25504 -25507.

AMA Style

Alison B. Walker, Laurence Peter, Killian Lobato, P.J. Cameron. Analysis of Photovoltage Decay Transients in Dye-Sensitized Solar Cells†. The Journal of Physical Chemistry B. 2006; 110 (50):25504-25507.

Chicago/Turabian Style

Alison B. Walker; Laurence Peter; Killian Lobato; P.J. Cameron. 2006. "Analysis of Photovoltage Decay Transients in Dye-Sensitized Solar Cells†." The Journal of Physical Chemistry B 110, no. 50: 25504-25507.

Research article
Published: 07 October 2006 in The Journal of Physical Chemistry B
Reads 0
Downloads 0

A novel type of dye-sensitized cell (DSC) with a passivated titanium sensor electrode located on top of the nanocrystalline titanium dioxide layer has been used to study the temperature dependence of the electron quasi-Fermi level relative to the I3-/I- redox-Fermi level under short circuit conditions. The results show that the Fermi level decreases with increasing temperature (−1.76 meV K-1) as predicted for diffusive electron transport at short circuit. A smaller temperature dependence (−0.25 meV K-1) of the position of the TiO2 conduction band relative to the I3-/I- redox-Fermi level was deduced from the shifts in the trap distribution. An expression for the temperature dependence of the open circuit voltage, Uphoto, has been derived. The experimentally observed temperature dependence of Uphoto gave values of the activation energy (0.25 eV) and preexponential factor (108 s-1) for the transfer of electrons from the conduction band of the nanocrystalline TiO2 to triiodide ions.

ACS Style

K. Lobato; Laurence Peter. Direct Measurement of the Temperature Coefficient of the Electron Quasi-Fermi Level in Dye-Sensitized Nanocrystalline Solar Cells Using a Titanium Sensor Electrode. The Journal of Physical Chemistry B 2006, 110, 21920 -21923.

AMA Style

K. Lobato, Laurence Peter. Direct Measurement of the Temperature Coefficient of the Electron Quasi-Fermi Level in Dye-Sensitized Nanocrystalline Solar Cells Using a Titanium Sensor Electrode. The Journal of Physical Chemistry B. 2006; 110 (43):21920-21923.

Chicago/Turabian Style

K. Lobato; Laurence Peter. 2006. "Direct Measurement of the Temperature Coefficient of the Electron Quasi-Fermi Level in Dye-Sensitized Nanocrystalline Solar Cells Using a Titanium Sensor Electrode." The Journal of Physical Chemistry B 110, no. 43: 21920-21923.

Rapid communication
Published: 03 August 2006 in The Journal of Physical Chemistry B
Reads 0
Downloads 0

The spatial dependence of the electron quasi-Fermi level (QFL) in the interior of dye sensitized nanocrystalline solar cells (DSC) under short circuit conditions can be inferred from calculations based on a diffusive electron transport model. The calculations predict that the difference in the QFL between the electrolyte and contact sides of the TiO2 layer under short circuit conditions at 1 sun could be as much as 0.5−0.7 eV. The predicted QFL profiles depend on assumptions made about energy positions, electron mobility, and the conduction band density of states. In this work, the position of the QFL at the electrolyte side of the dye sensitized TiO2 film in a DSC has been measured using a thin passivated titanium contact deposited on top of the nanocrystalline TiO2 by evaporation. The method allows changes in the electron QFL at all points on the IV characteristic of the cell to be monitored under dark and photostationary conditions. In addition, cells incorporating the titanium electrode can give information about the behavior of the QFL under dynamic conditions.

ACS Style

K. Lobato; Laurence Peter; Uli Würfel. Direct Measurement of the Internal Electron Quasi-Fermi Level in Dye Sensitized Solar Cells Using a Titanium Secondary Electrode. The Journal of Physical Chemistry B 2006, 110, 16201 -16204.

AMA Style

K. Lobato, Laurence Peter, Uli Würfel. Direct Measurement of the Internal Electron Quasi-Fermi Level in Dye Sensitized Solar Cells Using a Titanium Secondary Electrode. The Journal of Physical Chemistry B. 2006; 110 (33):16201-16204.

Chicago/Turabian Style

K. Lobato; Laurence Peter; Uli Würfel. 2006. "Direct Measurement of the Internal Electron Quasi-Fermi Level in Dye Sensitized Solar Cells Using a Titanium Secondary Electrode." The Journal of Physical Chemistry B 110, no. 33: 16201-16204.

Research article
Published: 21 July 2005 in The Journal of Physical Chemistry B
Reads 0
Downloads 0

Electron transport and recombination in dye-sensitized nanocrystalline solar cells (DSCs) are strongly influenced by the presence of trapping states in the titanium dioxide particles, and collection of photoinjected electrons at the contact can require times ranging from milliseconds to seconds, depending on the illumination intensity. A direct method of determining the density and energetic distribution of the trapping states responsible for slowing electron transport has been developed. It involves extraction of trapped electrons by switching the cell from an open circuit to a short circuit after a period of illumination. An advantage of this charge extraction method is that it is less sensitive than other methods to shunting of the DSC by electron transfer at the conducting glass substrate. Results derived from charge extraction measurements on DSCs (with and without compact TiO2 blocking layers) are compared with those obtained by analysis of the open circuit photovoltage decay.

ACS Style

M. Bailes; P.J. Cameron; K. Lobato; Laurence Peter. Determination of the Density and Energetic Distribution of Electron Traps in Dye-Sensitized Nanocrystalline Solar Cells. The Journal of Physical Chemistry B 2005, 109, 15429 -15435.

AMA Style

M. Bailes, P.J. Cameron, K. Lobato, Laurence Peter. Determination of the Density and Energetic Distribution of Electron Traps in Dye-Sensitized Nanocrystalline Solar Cells. The Journal of Physical Chemistry B. 2005; 109 (32):15429-15435.

Chicago/Turabian Style

M. Bailes; P.J. Cameron; K. Lobato; Laurence Peter. 2005. "Determination of the Density and Energetic Distribution of Electron Traps in Dye-Sensitized Nanocrystalline Solar Cells." The Journal of Physical Chemistry B 109, no. 32: 15429-15435.

Text
Published: 01 January 2003 in Review of Scientific Instruments
Reads 0
Downloads 0

A comparative technique based on photothermalradiometry has been developed to measurethermal diffusivity of semi-infinite targets with arbitrary geometry. The technique exploits the principle that the frequency response of the temperature modulation induced by a periodic modulated heating source (in this case a laser spot) scales with thermal diffusivity. To demonstrate this technique, a photothermalradiometer has been developed, which detects modulated thermal radiance at a wavelength of 2 μm due to a small temperature modulation induced on the target surface by a modulated erbium fiber laser of power 1 W. Two frequency responses were measured for platinum and oxidized Inconel 600 targets (the frequency response is a scan of the amplitude of the modulated thermal radiance over laser modulation frequency). Scaling the two responses with respect to frequency gives a ratio of thermal diffusivities D platinum /D Inconel of 4.45(33) which compares with a literature value of 4.46(50). The aim is to combine this technique with laser absorption radiation thermometry to produce multithermal property instrument for measuring “industrial” targets.

ACS Style

Andrew Levick; Killian Lobato; Gordon Edwards. Development of the laser absorption radiation thermometry technique to measure thermal diffusivity in addition to temperature. Review of Scientific Instruments 2003, 74, 612 -614.

AMA Style

Andrew Levick, Killian Lobato, Gordon Edwards. Development of the laser absorption radiation thermometry technique to measure thermal diffusivity in addition to temperature. Review of Scientific Instruments. 2003; 74 (1):612-614.

Chicago/Turabian Style

Andrew Levick; Killian Lobato; Gordon Edwards. 2003. "Development of the laser absorption radiation thermometry technique to measure thermal diffusivity in addition to temperature." Review of Scientific Instruments 74, no. 1: 612-614.