有机太阳能电池
轨道能级差
接受者
噻吩
侧链
化学
电子受体
带隙
光化学
分子间力
聚合物
材料科学
光电子学
有机化学
分子
物理
凝聚态物理
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
摘要
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.
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