In this section, you can access to the latest technical information related to the FUTURE project topic.

Isomers of Dithienocyclopentapyrene?Based Non?fullerene Electron Acceptors: Configuration Effect on Photoelectronic Properties

One pair of isomers, centrosymmetric anti?Py?1 and axisymmetric syn?Py?2, were designed and synthesized with an acceptor?donor?acceptor (A?D?A) structure by choosing dithienocyclopentapyrene with four 4?hexylphenyl side chains as D unit, and 2?(5,6?difluoro?3?oxo?2,3?dihydro?1H?inden?1?ylidene) malononitrile as 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 electron acceptor materials and PTB7?Th as electron donor materials exhibit a power conversion efficiency (PCE) of 6.07%, 60% higher than that of Py?2 (3.7%), which could be mainly attributed to the higher and more balanced hole/electron mobility and better phase separation of Py?1–based active layer.

» Author: Jianglin Wu, Yao Chen, Bin Hu, Zhenguo Pang, Zhiyun Lu, Yan Huang

» Reference: doi:10.1002/chem.201900296

» Publication Date: 04/03/2019

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