NDLI: All-conjugated poly(3-alkylthiophene) diblock copolymer-based bulk heterojunction solar cells with controlled molecular organization and nanoscale morphology

Content Provider	Royal Society of Chemistry (RSC)
Author	He, Ming Han, Wei Lin, Zhiqun Yang, Yuliang Qiu, Feng Ge, Jing
Copyright Year	2011
Abstract	Control over the ratio of two blocks in a new class of all-conjugated diblock copolymers, poly(3-butylthiophene)-b-poly(3-hexylthiophene) (P3BHT), provides a facile approach to precisely tune the molecular organization and nanoscale morphology in polymer bulk heterojunction (BHJ) solar cells. In stark contrast to the power conversion efficiency, PCE, of 1.08% in poly(3-butylthiophene) (P3BT)/[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) and 3.54% in poly(3-hexylthiophene) (P3HT)/PC71BM solar cells, an attractive, high PCE of 4.02% was achieved in a P3BHT21/PC71BM BHJ device in which the molar ratio of P3BT : P3HT in P3BHT21 was 2 : 1. The ratio of P3BT and P3HT blocks was found to exert a noteworthy influence on the molecular organization of P3BHT, the film morphology of P3BHT/PC71BM blend, and the final performance of P3BHT/PC71BM photovoltaic devices. This enhanced performance reflected a synergy of finer phase separation of P3BHT21 and PC71BM and the formation of respective percolation networks of electron donor P3BHT and electron acceptor PC71BM. The P3HT block rendered the P3BHT chains with favorable chemical compatibility for the diffusion of PC71BM molecules, allowing for finer phase separation between P3BHT crystalline domains and PC71BM domains at the nanoscale and maximizing the interfacial area of P3BHT21/PC71BM for improved charge generation. The P3BT block facilitated the self-assembly of P3BHT chains into sufficient interpenetrating pathways for efficient charge transport and collection. Moreover, a small crystalline domain with a size of 10.4 nm formed in the active layer that is comparable to the exciton diffusion length of most conjugated polymers (∼10 nm).
Starting Page	2894
Ending Page	2902
Page Count	9
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	4
Issue Number	8
Journal	Energy & Environmental Science
DOI	10.1039/c1ee01509e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Polymer Heterojunction Acid Ester Polythiophene Concentration Solar cell Percolation Electron donor Electron acceptor Diffusion Self-assembly Exciton
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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