Non-Fullerene Acceptor for Organic Solar Cells with Chlorination on Dithieno[3,2-b:2′,3′-d]pyrrol Fused-Ring

Renyong Geng, Xin Song, Haohao Feng, Jiangsheng Yu, Ming Zhang, Nicola Gasparini, Zhuohan Zhang, Feng Liu, Derya Baran, Weihua Tang

Research output: Contribution to journalArticlepeer-review

96 Scopus citations

Abstract

A narrow-band-gap molecular acceptor, IPIC-4Cl, featuring an indacenobis(dithieno[3,2-b:2′,3′-d]pyrrol) (INP) core with 2-butyl-1-octyl side chains and chlorinated (dicyanomethylidene)-indan-1-one (IC) as electron-accepting end group, has been rationally designed as nonfullerene acceptors (NFAs) for organic solar cells (OSCs). The impact of chlorination on the acceptor unit is revealed by a comparison study with two counterpart NFAs bearing a fluorinated or nonhalogenated IC unit. The synergetic photophysical and morphological analyses reveal that PBDB-T:IPIC-4Cl blend possesses efficient exciton dissociation and charge collection integrated with higher crystallinity and optimized phase separation. Consequently, the OSCs constructed by PBDB-T:IPIC-4Cl obtain a champion power conversion efficiency (PCE) of 13.4% with an extremely low energy loss of 0.51 eV. More encouragingly, we achieve a higher photovoltaic performance of 14.3% for ternary solar cells by combining an optimal amount of PC71BM with PBDB-T:IPIC-4Cl blend.
Original languageEnglish (US)
Pages (from-to)763-770
Number of pages8
JournalACS Energy Letters
Volume4
Issue number3
DOIs
StatePublished - Feb 22 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work is financially supported by the National Natural Science Foundation of China (Grant 51573077, 21875111), Jiangsu Province Natural Science Foundation (BK20180496, BK20130032), the 333 Project to Cultivate High Level Talents in Jiangsu Province, Six Talent Peaks Project in Jiangsu Province, and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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