Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University , Beijing 100871, China.
Department of Chemistry, Capital Normal University , Beijing 100048, China.
J Am Chem Soc. 2016 Apr 13;138(14):4955-61. doi: 10.1021/jacs.6b02004. Epub 2016 Apr 1.
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.
我们开发了一种基于茚并二噻吩[3,2-b]噻吩核心和噻吩侧链的高效稠环电子受体（ITIC-Th），用于有机太阳能电池（OSCs）。与具有苯基侧链的 ITIC 相比（ITIC），由于噻吩侧链的σ-诱导效应，ITIC-Th 的能级较低（ITIC-Th：HOMO = -5.66 eV，LUMO = -3.93 eV；ITIC：HOMO = -5.48 eV，LUMO = -3.83 eV），可以与高性能的窄带隙聚合物给体和宽带隙聚合物给体匹配。由于硫-硫相互作用引起的分子间相互作用增强，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)）。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给体共混来制备 OSCs。在一种情况下，观察到 9.6%的功率转换效率，这与基于富勒烯受体的单结 OSCs 的一些最高效率相当。
