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Published on: July 27, 2018
Isomers of Dithienocyclopentapyrene-Based Non-Fullerene Electron Acceptors: Configuration Effect on Photoelectronic
Jianglin Wu1, Yao Chen1, Bin Hu1
1Key Laboratory of Green Chemistry and Technology, (Ministry of Education), College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China.
Abstract:
One pair of isomers, centrosymmetric anti-Py-1 and axisymmetric syn-Py-2, was designed and synthesized with an acceptor-donor-acceptor (A-D-A) structure by choosing dithienocyclopentapyrene with four 4-hexylphenyl side chains as the D unit, and 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene) malononitrile as the A unit. In-depth structure-property relationship studies revealed that the isomers have similar UV/Vis absorption, fluorescence emission, and energy levels but significant differences in molecular shape, polarity, and charge mobility. Solution-processed bulk-heterojunction (BHJ) small-molecule organic solar cells with Py-1 as the electron-acceptor material and PTB7-Th as the electron-donor material exhibit a power conversion efficiency (PCE) of 6.07 %, or 60 % higher than that of Py-2 (3.7 %), which could be mainly attributed to the higher and more balanced hole/electron mobilities and better phase separation of the Py-1-based active layer.
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