Oh Sora, Kim Da Hun, Ahn Taek, Lee Sang Kyu
J Nanosci Nanotechnol. 2018 Oct 1;18(10):7221-7224. doi: 10.1166/jnn.2018.15498.
A novel series of benzodithiophene-4,8-dione (BDD)-based copolymers, poly[(4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro-s-indacenodithiophene-2,7-diyl)-alt-(1,3-bis(2-ethylhexyl)-5,7-di(thiophene2-yl)benzodithiophene-4,8-dione)] (P1) and poly[(5,5,11,11-tetrakis(4-hexylphenyl)dithieno[2,3-d: 2',3'-d']-s-indacenodithiophene-3,9-diyl)-alt-(1,3-bis(2-ethylhexyl)-5,7-di(thiophene-2-yl)benzodithiophene-4,8-dione)] (P2), which have the same acceptor moiety but different donor segments, have been designed and synthesized for use as donor materials in solution-processable polymer solar cells (PSCs). The optical and photovoltaic properties of the copolymers were investigated. The band gaps of the copolymers were in the range 1.91-1.92 eV. Under optimized conditions, the BDD-based polymers showed power conversion efficiencies (PCEs) for the PSCs in the range 2.52-2.92% under AM 1.5 illumination (100 mW/cm2). Among the copolymers, P1, which contained an indacenodithiophene donor unit, showed a power conversion efficiency of 2.92% with a short circuit current of 7.30 mA/cm2, open circuit voltage of 0.92 V, and a fill factor of 0.43, under AM 1.5 illumination (100 mW/cm2).
设计并合成了一系列新型的基于苯并二噻吩-4,8-二酮（BDD）的共聚物，聚[(4,4,9,9-四(4-己基苯基)-4,9-二氢-s-茚并二噻吩-2,7-二基)-alt-(1,3-双(2-乙基己基)-5,7-二(噻吩-2-基)苯并二噻吩-4,8-二酮)]（P1）和聚[(5,5,11,11-四(4-己基苯基)二噻吩并[2,3-d:2',3'-d']-s-茚并二噻吩-3,9-二基)-alt-(1,3-双(2-乙基己基)-5,7-二(噻吩-2-基)苯并二噻吩-4,8-二酮)]（P2），它们具有相同的受体部分但供体链段不同，用作溶液可加工聚合物太阳能电池（PSC）中的供体材料。研究了这些共聚物的光学和光伏性能。共聚物的带隙在1.91 - 1.92 eV范围内。在优化条件下，基于BDD的聚合物在AM 1.5光照（100 mW/cm²）下，PSC的功率转换效率（PCE）在2.52 - 2.92%范围内。在这些共聚物中，含有茚并二噻吩供体单元的P1在AM 1.5光照（100 mW/cm²）下，功率转换效率为2.92%，短路电流为7.30 mA/cm²，开路电压为0.92 V，填充因子为0.43。
