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Enhanced intermolecular interactions to improve twisted polymer photovoltaic performance.
- Source :
- SCIENCE CHINA Chemistry; Mar2019, Vol. 62 Issue 3, p370-377, 8p
- Publication Year :
- 2019
-
Abstract
- In polymer solar cells (PSCs), twisted polymer donors usually have low photovoltaic efficiencies due to their poor photoactive layer morphologies. Herein, we successfully improved twisted polymer (PBDT-3T) photovoltaic efficiency by employing C=O groups (PBDT-3TCO) to enhance intermolecular interactions. The maximum power conversion efficiency (PCE) of PBDT-3T is only 1.05%, while the PCE of PBDT-3TCO reaches 11.77% in non-fullerene (NF) PSCs. Both polymers-based PSCs show very similar open-circuit voltages but remarkable differences in their short-circuit currents and fill factors. The single crystals of both functionalized terthiophenes with methyl substituents demonstrate that the terthiophene with C=O units changes molecular pattern by forming intra/inter molecular S⋯O and O⋯H interactions but its molecular planarity does not significantly improve. Our comparative studies show that PBDT-3TCO with C=O units possesses a strong aggregation property and optimal photoactive layer morphology in NF PSCs. This study provides important insight into the design of high-performance twisted polymer donors for NF PSCs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16747291
- Volume :
- 62
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- SCIENCE CHINA Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 135326960
- Full Text :
- https://doi.org/10.1007/s11426-018-9408-7