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.

中文翻译：

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用于有机光伏的具有噻吩基侧链的高性能电子受体

我们为有机太阳能电池 (OSC) 开发了一种基于茚二噻吩并 [3,2-b] 噻吩核和噻吩基侧链的高效稠环电子受体 (ITIC-Th)。相对于其带有苯基侧链的对应物 (ITIC)，ITIC-Th 显示出较低的能级（ITIC-Th：HOMO = -5.66 eV，LUMO = -3.93 eV；ITIC：HOMO = -5.48 eV，LUMO = -3.83 eV ) 由于噻吩基侧链的 σ 诱导作用，可与高性能窄带隙聚合物供体和宽带隙聚合物供体相匹配。ITIC-Th 的电子迁移率 (6.1 × 10(-4) cm(2) V(-1) s(-1)) 高于 ITIC (2.6 × 10(-4) cm(2) V(-1) s (-1)) 由于硫-硫相互作用引起的分子间相互作用增强。我们通过将 ITIC-Th 受体与两种不同的低带隙和宽带隙聚合物供体混合来制造 OSC。在一种情况下，电源转换效率为 9。