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Synergistic Effects of Chlorination and Branched Alkyl Side Chain on the Photovoltaic Properties of Simple Non‐Fullerene Acceptors with Quinoxaline as the Core
Author(s) -
Ye Shounuan,
Chen Shuaishuai,
Li Shuixing,
Pan Youwen,
Xia Xinxin,
Fu Weifei,
Zuo Lijian,
Lu Xinhui,
Shi Minmin,
Chen Hongzheng
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202100689
Subject(s) - quinoxaline , alkyl , stacking , side chain , fullerene , conjugated system , intramolecular force , organic solar cell , electron acceptor , chemistry , materials science , photochemistry , polymer chemistry , organic chemistry , polymer
To date, the fused‐ring electron acceptors show the best photovoltaic performances, and the development of simple non‐fullerene acceptors via intramolecular noncovalent interactions can reduce synthetic costs. In this work, four simple non‐fullerene acceptors with an A‐D‐A’‐D‐A configuration (QCIC1, QCIC2, QCIC3, and QCIC4) were synthesized. They contained the same conjugated backbone (A’: quinoxaline; D: cyclopentadithiophene; A: dicyano‐indanone) but different halogen atoms and alkyl side chains. Due to the chlorination on the end‐groups and the most and/or longest branched alkyl side chains on the backbone, the blended film composed of QCIC3 and donor poly{[2,6′‐4,8‐di(5‐ethylhexylthienyl)benzo [1,2‐b : 4,5‐b′]dithiophene]‐ alt ‐[5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo[1′,2′‐c : 4′,5′‐c′]dithiophene‐4,8‐dione)]} (PBDB‐T) exhibited the strongest π‐π stacking and the most suitable phase‐separation domains among the four blended films. Therefore, the QCIC3‐based organic solar cells yielded the highest power conversion efficiency of 10.55 %. This work provides a pathway to optimize the molecular arrangements and enhance the photovoltaic property of simple electron acceptors through subtle chemical modifications.