Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 27, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201702194
Keywords
fullerene-free polymer solar cells; selenophene; side groups; small molecular acceptors; thiophene
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Funding
- National Natural Science Foundation of China (NSFC) [21572171, 91433201, 61377029, 61675017]
- National Basic Research Program of China (973 Program) [2013CB834805]
- Innovative Research Group of Hubei Province [2015CFA014]
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Side group of ITIC-like small molecular acceptor (SMA) plays a critical role in crystallization property. In this article, two new SMAs with n-hexylthienyl and n-hexylselenophenyl as side chain, namely ITCPTC-Th and ITCPTC-Se, are designed and synthesized by employing newly developed thiophene-fused ending group (CPTCN). And thiophene and selenophene side group substituted effects of SMA-based fullerene-free polymer solar cells (PSCs) are investigated. A stronger s-inductive effect between selenophene side group and electron-donating backbone endows ITCPTC-Se with better optical absorption and higher LUMO level, ITCPTC-Th-based PSCs deliver a higher power conversion efficiency of 10.61%. Charge transport and collection, recombination loss mechanism, and morphology of blend films are intensively studied. These results confirm that side group substituted effects of SMAs are multiple and thiophene is a superior option to selenophene as aromatic side group of ITIC-like SMAs.
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