Z-Shaped Fused-Chrysene Electron Acceptors for Organic Photovoltaics

Bing Lu; Yiqun Xiao; Tengfei Li; Kuan Liu; Xinhui Lu; Jiarong Lian; Pengju Zeng; Junle Qu; Xiaowei Zhan

doi:10.1021/acsami.9b10834

Z-Shaped Fused-Chrysene Electron Acceptors for Organic Photovoltaics

ACS Appl Mater Interfaces. 2019 Sep 11;11(36):33006-33011. doi: 10.1021/acsami.9b10834. Epub 2019 Aug 28.

Authors

Bing Lu^{1

2}, Yiqun Xiao³, Tengfei Li², Kuan Liu², Xinhui Lu³, Jiarong Lian¹, Pengju Zeng¹, Junle Qu¹, Xiaowei Zhan²

Affiliations

¹ Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering , Shenzhen University , Shenzhen 518060 , China.
² Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education , Peking University , Beijing 100871 , China.
³ Department of Physics , The Chinese University of Hong Kong , New Territories 999077 , Hong Kong , China.

PMID: 31414589
DOI: 10.1021/acsami.9b10834

Abstract

A new fused-chrysene electron-donating core is synthesized, where chrysene is condensed with two thiophenes via two dihydrobenzene rings. Based on this building block coupled with two electron-accepting end groups of 1,1-dicyanomethylene-3-indanone, a new Z-shaped fused-ring electron acceptor, FCIC, is designed and synthesized. FCIC shows intense absorption in the 500-850 nm region, with a maximum molar absorptivity of 1.5 × 10⁵ M^-1 cm^-1, a bandgap of 1.50 eV, and a charge mobility of 2.5 × 10^-4 cm² V^-1 s^-1. The ternary organic photovoltaic cells based on PTB7-Th/F8IC/FCIC yield an efficiency of 12.6%, higher than that of the binary cells of PTB7-Th/F8IC (10.7%) and PTB7-Th/FCIC (7.21%). Relative to the PTB7-Th/F8IC binary blend, the addition of FCIC leads to improvement in the open-circuit voltage, short-circuit current, and fill factor.

Keywords: Z-shaped; chrysene; fused-ring electron acceptor; nonfullerene acceptor; organic photovoltaic.