Non-halogenated solvent-processed ternary-blend solar cells: Via alkyl-side-chain engineering of a non-fullerene acceptor and their application in large-area devices

Taeho Lee, Sora Oh, Shafket Rasool, Chang Eun Song, Dongwook Kim, Sang Kyu Lee, Won Suk Shin, Eunhee Lim

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Solution processability is one of the advantages of organic solar cells (OSCs). However, most high-efficiency OSCs are prepared using hazardous chlorinated solvents for the deposition of photoactive layers. The replacement of non-halogenated solvents with eco-friendly green solvents for photoactive materials is urgently required. Herein, we have developed a novel asymmetric T2-OEHRH, which is modified from the symmetric T2-ORH. The introduction of asymmetric alkyl side chains onto rhodanine end groups can effectively suppress excessive self-aggregation/crystallization and substantially improve solubility without sacrificing optoelectrical properties. Therefore, ternary-blend OSCs based on PTB7-Th:EH-IDTBR:T2-OEHRH processed using a non-halogenated solvent system exhibit a uniform and favorable morphology and give a high power conversion efficiency (PCE) of 12.10%. More importantly, we demonstrate an impressive PCE of 9.32% for large-area NFA-OSCs (substrate size = 100 cm2 and aperture size = 55.5 cm2) prepared via D-bar coating in air. To our knowledge, this PCE is the highest reported to date for NFA-based large-area OSC modules processed from a non-halogenated solvent. This asymmetric alkyl-chain engineering strategy can be exploited to develop high-performance large-area NFA-OSCs with eco-friendly solvent processing.

Original languageEnglish
Pages (from-to)10318-10330
Number of pages13
JournalJournal of Materials Chemistry A
Volume8
Issue number20
DOIs
StatePublished - 28 May 2020

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