Enhancing Performance of Nonfullerene Acceptors via Side‐Chain Conjugation Strategy

Wang, Jiayu; Wang, Wei; Wang, Xiaohui; Wu, Yang; Zhang, Qianqian; Yan, Cenqi; Ma, Wei; You, Wei; Zhan, Xiaowei

doi:10.1002/adma.201702125

Title: Enhancing Performance of Nonfullerene Acceptors via Side‐Chain Conjugation Strategy

Journal Article · Mon Jul 17 00:00:00 EDT 2017 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201702125· OSTI ID:1390637

Wang, Jiayu ^[1]; Wang, Wei ^[1]; Wang, Xiaohui ^[2]; Wu, Yang ^[2]; Zhang, Qianqian ^[3]; Yan, Cenqi ^[1]; Ma, Wei ^[2]; You, Wei ^[3]; Zhan, Xiaowei ^[1]

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
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
Department of Chemistry University of North Carolina at Chapel Hill Chapel Hill NC 27599‐3290 USA

A side‐chain conjugation strategy in the design of nonfullerene electron acceptors is proposed, with the design and synthesis of a side‐chain‐conjugated acceptor (ITIC2) based on a 4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐ b :4,5‐ b′ ]di(cyclopenta‐dithiophene) electron‐donating core and 1,1‐dicyanomethylene‐3‐indanone electron‐withdrawing end groups. ITIC2 with the conjugated side chains exhibits an absorption peak at 714 nm, which redshifts 12 nm relative to ITIC1. The absorption extinction coefficient of ITIC2 is 2.7 × 10 ⁵ m ⁻¹ cm ⁻¹ , higher than that of ITIC1 (1.5 × 10 ⁵ m ⁻¹ cm ⁻¹ ). ITIC2 exhibits slightly higher highest occupied molecular orbital (HOMO) (−5.43 eV) and lowest unoccupied molecular orbital (LUMO) (−3.80 eV) energy levels relative to ITIC1 (HOMO: −5.48 eV; LUMO: −3.84 eV), and higher electron mobility (1.3 × 10 ⁻³ cm ² V ⁻¹ s ⁻¹ ) than that of ITIC1 (9.6 × 10 ⁻⁴ cm ² V ⁻¹ s ⁻¹ ). The power conversion efficiency of ITIC2‐based organic solar cells is 11.0%, much higher than that of ITIC1‐based control devices (8.54%). Our results demonstrate that side‐chain conjugation can tune energy levels, enhance absorption, and electron mobility, and finally enhance photovoltaic performance of nonfullerene acceptors.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐AC02‐05CH11231

OSTI ID:: 1390637

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Vol. 29 Journal Issue: 35; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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