High-Performance Electron Acceptor with Thienyl Side Chains for Organic Photovoltaics

作者：Yuze Lin, Fuwen Zhao, Qiao He, Lijun Huo, Yang Wu, Timothy C. Parker, Wei Ma, Yanming Sun, Chunru Wang, Daoben Zhu, Alan J. Heeger, Seth R. Marder, Xiaowei Zhan · 发表于：Journal of the American Chemical Society · 年份：2016 · DOI：10.1021/jacs.6b02004 · 被引用次数：976 · 研究领域：Organic Electronics and Photovoltaics、Conducting polymers and applications、Organic and Molecular Conductors Research

We develop an efficient fused-ring electron acceptor (ITIC-Th) based on indacenodithieno[3,2-b]thiophene core and thienyl side-chains for organic solar cells (OSCs). Relative to its counterpart with phenyl side-chains (ITIC), ITIC-Th shows lower energy levels (ITIC-Th: HOMO = -5.66 eV, LUMO = -3.93 eV; ITIC: HOMO = -5.48 eV, LUMO = -3.83 eV) due to the σ-inductive effect of thienyl side-chains, which can match with high-performance narrow-band-gap polymer donors and wide-band-gap polymer donors. ITIC-Th has higher electron mobility (6.1 × 10(-4) cm(2) V(-1) s(-1)) than ITIC (2.6 × 10(-4) cm(2) V(-1) s(-1)) due to enhanced intermolecular interaction induced by sulfur-sulfur interaction. We fabricate OSCs by blending ITIC-Th acceptor with two different low-band-gap and wide-band-gap polymer donors. In one case, a power conversion efficiency of 9.6% was observed, which rivals some of the highest efficiencies for single junction OSCs based on fullerene acceptors.