標題: Improved thin film morphology and bulk-heterojunction solar cell performance through systematic tuning of the surface energy of conjugated polymers
作者: Sun, Ying
Chien, Shang-Chieh
Yip, Hin-Lap
Chen, Kung-Shih
Zhang, Yong
Davies, Joshua A.
Chen, Fang-Chung
Lin, Baoping
Jen, Alex K. -Y.
光電工程學系
顯示科技研究所
Department of Photonics
Institute of Display
公開日期: 2012
摘要: A detailed model study has shown that thin film morphology and bulk-heterojunction solar cell performance can be significantly improved by systematic tuning of the surface energy of the conjugated donor polymer through side-chain functionalization. Thiophene-flanked diketopyrrolopyrrole (DPP) moieties with different contents of cyanohexane side chains were incorporated into three low band-gap conjugated copolymers (PIDTDPP1, PIDTDPP2 and PIDTDPP3) consisting of indacenodithiophene (IDT) donors and DPP acceptors. The resulting polymers possessed good solubility in common organic solvents and showed similar energy levels, bandgaps, and hole mobilities. However, the introduction of cyano groups onto the terminal of side-chains significantly changed their surface energy. Topographical images obtained from atomic force microscopy (AFM) proved that a better matched surface energy between polymer and PC71BM had led to enhanced miscibility, which resulted in better BHJ film morphology. Consistent with the surface energy enhancement, the performance of BHJ photovoltaic devices increased from 0.97% for PIDTDPP1, to 2.16% for PIDTDPP2 then to 3.67% for PIDTDPP3. These results clearly reveal that tuning surface energy is an effective way to improve the morphology of the BHJ active layer and efficiency of the photovoltaic device.
URI: http://hdl.handle.net/11536/15691
http://dx.doi.org/10.1039/c2jm15517f
ISSN: 0959-9428
DOI: 10.1039/c2jm15517f
期刊: JOURNAL OF MATERIALS CHEMISTRY
Volume: 22
Issue: 12
起始頁: 5587
結束頁: 5595
顯示於類別:期刊論文


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  1. 000300838100046.pdf