The CFSN Seminar by Professor Chi-An Dai

2020.01.15 15:00

Self-Organization Strategy for Organic Photovoltaic Application
Professor Chi-An Dai

Department of Chemical Engineering , National Taiwan University

Organic photovoltaic devices based on π-conjugated polymers have attracted great interests recently. So far, the most popular devices have been made by using bulk heterojunction (BHJ) systems based on poly(3-hexylthiophene) (P3HT). In this presentation, we report on a novel approach to fabricate organic photovoltaic devices, wherein a self-assembling block copolymer containing P3HT was utilized to directly co-assemble PCBM, ZnO or TiO2 into a well-defined “double-channel” network (DCN) nanostructure for efficient charge transport, enhanced exciton separation, and prolonged thermal stability. As a consequence of the structural development, the photovoltaic devices with the DCN structure exhibit better power conversion efficiency than those from a conventional BHJ solar cell. These results show promise for the practical usage of all-conjugated block copolymers with different main chain moieties towards the fabrication of organic photovoltaic devices with improved stability and competitive optoelectronic properties.

[1] Yu-Ping Lee, Chi-Ju Chiang, Pin-Chia Jen, Bo-Ting Chou, Leeyih Wang, Yao-Yi Cheng, Yi-Huan Lee,* Yi-Fan Chen, Chih-Chen Hsieh, and Chi-An Dai* “Synergistic In Situ Hybrid Synthesis of Highly Crystalline P3HT/ZnO Nanowires at Elevated Pressures” ACS Appl. Energy. Mater. 2018, 1, 1930.
[2] Chi-Ju Chiang, Yi-Huan Lee, Yu-Ping Lee, Guan-Ting Lin, Ming-Hao Yang, Leeyih Wang, Chih-Chen Hsieh,* and Chi-An Dai* ”One-Step In Situ Hydrothermal Fabrication of D/A Poly(3-hexylthiophene)/TiO2 Hybrid Nanowires and Its Application in Photovoltaic Devices” J. Mater. Chem. A. 2016, 4, 908.
[3] Yi-Huan Lee, Wei-Chih Chen, Kuo-Chang Kau, Yu-Ping Lee, Wei-Shin Liou, Leeyih Wang,* and Chi-An Dai* “A New Strategy for Fabricating Organic Photovoltaic Devices with Stable D/A Double-Channel Network to Enhance Performance Using Self-Assembling All-Conjugated Diblock Copolymer” Nano Energy 2015, 13, 103.

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