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

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• 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
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：138
• 期：14
• 页码：4955-4961
• 全文大小：497K
• 年卷期：0
• ISSN：1520-5126

文摘

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 cm² V^–1 s^–1) than ITIC (2.6 × 10^–4 cm² 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.