Prof. Fang-Chung Chen

We have explored the effect of gold nanoparticle (Au NP)-induced surface plasmons on the performance of organic photovoltaic devices (OPVs). The power conversion efficiency of these OPVs was improved after blending the Au NPs into the anodic buffer layer. The addition of Au NPs increased the rate of exciton generation and the probability of exciton dissociation, thereby enhancing the short-circuit current density and the fill factor. We attribute the improvement in device performance to the local enhancement in the electromagnetic field originating from the excitation of the localized surface plasmon resonance.

12 September 2011 in Chemical Communications

Journal Article

Increased open circuit voltage in fluorinated benzothiadiazole-based alternating conjugated polymers

Yong Zhang

Shang-Chieh Chien

Kung-Shih Chen

Hin-Lap Yip

Ying Sun

Alex K.-Y. Jen

Small band-gap conjugated polymers based on monofluoro- and difluoro-substituted benzothiadiazole were developed. Highly efficient polymer solar cells (PCE as high as 5.40%) could be achieved for devices made from these polymers.

11 October 2004 in Applied Physics Letters

Journal Article

Organic thin-film transistors with nanocomposite dielectric gate insulator

Fang-Chung Chen

Chih-Wei Chu

Jun He

Yang Yang

Jen-Lien Lin

High-performance organic thin-film transistors (OTFTs) with a nanoparticle composite dielectric layer have been demonstrated. The dielectric layer consists of cross-linked poly-4-vinylphenol (PVP) and high-dielectric titanium dioxide

({TiO}_{2})

nanoparticles. Because of the nanosize of

{TiO}_{2}

, it disperses well in the organic solvent, which makes it possible to use solution-processable methods to prepare the dielectric layer. OTFTs with pentacene as the semiconducting layers have been demonstrated; it was found that the OTFTs with the nanocomposite dielectric layer have higher field-induced current than that of conventional devices because the dielectric constant of the gate insulator is increased. This finding opens an interesting direction for the preparation of high-performance OTFTs without complicated sputtering of high-

κ

dielectric materials.

1 April 2002 in Applied Physics Letters

Journal Article

High-performance polymer light-emitting diodes doped with a red phosphorescent iridium complex

Fang-Chung Chen

Yang Yang

Mark Thompson

Junji Kido

High efficiency has been achieved in polymer light-emitting diodes (PLEDs) exhibiting red emission by doping a fluorescence host material, poly(vinylcarbazole) (PVK), with an iridium(III) complex,

bis {[2-(2}^{'} {-benzothienyl)-pyridinato-N,C}^{3^{'}}] iridium(acetylacetonate)

(BtpIr). The electroluminescence spectrum has a maximum wavelength of 614 nm. The highest external quantum efficiency is 3.3%. Due to its short triplet excited lifetime (∼5 μs), the quenching of the triplet exciton in BtpIr-doped PVK PLEDs has been shown to be suppressed compared to platinum(II)-2,8,12,17-tetraethyl- 3,7,13,18-tetramethylporphyrin-doped PVK PLEDs. 65% of the peak efficiency can be sustained at high-current density and at the very high brightness of 1350 cd/m². We suggest that both triplet–triplet annihilation and polaron–triplet annihilation involves exciton quenching.

About Me

Fang-Chung Chen is a Professor at the Department of Photonics, College of Electrical and Computer Engineering, National Yang-Ming Chiao Tung University. He received a B.S. and master's degree in Chemistry from the National Taiwan University, Taiwan, in 1996 and 1998, respectively, and a Ph.D. degree in Materials Science and Engineering from the University of California, Los Angeles (UCLA), USA, in 2003. He was a teaching assistant at the Department of Chemistry, National Taiwan University in 1998. He was a postdoctoral research associate at the Department of Materials Science and Engineering, UCLA, from Oct. to Dec. in 2003. He joined the Department of Photonics and Display Institute at National Chiao Tung University (NCTU) in Feb. 2004 as an assistant Professor. He became a full Professor in 2012. He was also the chairman of the Degree Program of Flat Panel Display Technology at NCTU. His research interests include polymer solar cells, organic photodetectors, organic memories, organic light-emitting diodes and organic thin-film transistors. He is a recipient of the Award for Junior Research Investigators of Academia Sinica 2008, which is one of the most important awards for junior research investigators in all research fields in Taiwan.

Prof. Fang-Chung Chen

Prof. Fang-Chung Chen

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