Nonfullerene acceptors based on extended fused rings flanked with benzothiadiazolylmethylenemalononitrile for polymer solar cells

Huitao Bai; Yao Wu; Yifan Wang; Yang Wu; Rong Li; Pei Cheng; Mingyu Zhang; Jiayu Wang; Wei Ma; Xiaowei Zhan

doi:10.1039/C5TA05901A

Nonfullerene acceptors based on extended fused rings flanked with benzothiadiazolylmethylenemalononitrile for polymer solar cells†

Huitao Bai,

‡^ab Yao Wu,‡^a Yifan Wang,^bd Yang Wu,^c Rong Li,^a Pei Cheng,^bd Mingyu Zhang,^a Jiayu Wang,^a Wei Ma^c and Xiaowei Zhan*^a

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* Corresponding authors

^a Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing, P. R. China
E-mail: xwzhan@pku.edu.cn

^b Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China

^c State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, P. R. China

^d University of Chinese Academy of Sciences, Beijing, P. R. China

Abstract

Two novel A–D–A type molecules IDT–2BM and IDTT–2BM with extended fused-ring indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) units as cores and strong electron-withdrawing unit 2-(benzo[c][1,2,5]thiadiazol-4-ylmethylene)malononitrile (BM) as the end-capping group were synthesized and investigated as electron acceptors in solution-processed polymer solar cells (PSCs). IDT–2BM and IDTT–2BM exhibited strong and broad absorption from 300 to 800 nm, and appropriate LUMO (−3.8 eV) and HOMO (−5.5 to −5.6 eV) levels matching with the classical polymer donor PBDTTT-C-T. IDT–2BM and IDTT–2BM films exhibited intrinsic electron mobilities of about 3.7 × 10⁻⁶ and 1.0 × 10⁻⁵ cm² V⁻¹ s⁻¹, respectively. Fullerene-free PSCs employing PBDTTT-C-T as the donor and IDT–2BM or IDTT–2BM as the acceptor afforded power conversion efficiencies of 4.26% and 4.81%, respectively.

Journal of Materials Chemistry A

Nonfullerene acceptors based on extended fused rings flanked with benzothiadiazolylmethylenemalononitrile for polymer solar cells†

Abstract

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Nonfullerene acceptors based on extended fused rings flanked with benzothiadiazolylmethylenemalononitrile for polymer solar cells

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