Oxygen heterocycle-fused indacenodithiophenebithiophene enables an efficient non-fullerene molecular acceptor

Autor: Lingling Shui, Shanshan Chen, Haijun Fan, Qihui Yue, Hao Wu, Xiaozhang Zhu, Chaochao Xia
Rok vydání: 2019
Předmět:
Zdroj: Journal of Materials Chemistry C. 7:15344-15349
ISSN: 2050-7534
2050-7526
DOI: 10.1039/c9tc05041h
Popis: To improve the power conversion efficiency (PCE) of solar cells based on non-fullerene acceptors (NFAs), designing low bandgap NFAs of enhanced light-harvesting capability is desirable. Herein, a new set of NFAs based on an oxygen heterocycle-fused indacenodithiophenebithiophene core, were designed and synthesized, all of which achieved low bandgaps around 1.3 eV. An optimal power conversion efficiency of ∼8.4% was realized by systematic sidechain engineering. Detailed comparison based on the designed NFAs clarifies that the optimal molecule, IDTODT-3, contributes to a moderate phase separation with balanced charge transport and reduced recombination in the blend, and thus performs best. This work verifies the effectiveness of oxygen heterocycle-fusion on realizing LBG, which provides guidelines for designing efficient NFAs via molecule-engineering.
Databáze: OpenAIRE