Kim Ki-Won, Na Hyungjun, So Won-Wook, Yoon Sung Cheol, Shin Won Suk
Energy Materials Research Center, Korea Research Institute of Chemistry Technology, Sinseongno 19, Yuseong-Gu, Daejeon 305-600, Korea.
J Nanosci Nanotechnol. 2012 May;12(5):4279-83. doi: 10.1166/jnn.2012.5895.
A series of photoactive conjugated low band-gap copolymer (CPSB) and terpolyemrs (TPSBCz-n, n = 1 to 4) based on N-alkyl carbazole, 4,4'-dialkyl dithienosilole, and bezothiadiazole were synthesized. The copolymer and terpolymers were built with the fraction of the carbazole unit varied for 0, 2.5, 5, 10 and 25 mol%. Among the mixtures, the composition of 25 wt% of terpolymer bearing 10 mol.% of the carbazole unit, TPSBCz-3, and 75 wt% of C71-PCBM found a power conversion efficiency of 0.86% with a open-circuit voltage of 0.59 V, the short-circuit current of 4.85 mA and fill factor of 0.30 under AM 1.5 spectral illumination. Our findings suggest that terpolymer bearing low concentration of carbazole lead to a high power conversion efficiency with improved the short-circuit current due to hole mobility enhancement effect of carbazole unit.
合成了一系列基于N-烷基咔唑、4,4'-二烷基二噻吩并硅氧烷和苯并噻二唑的光活性共轭低带隙共聚物（CPSB）和三元共聚物（TPSBCz-n，n = 1至4）。共聚物和三元共聚物中咔唑单元的比例分别为0、2.5、5、10和25摩尔%。在这些混合物中，含有10摩尔%咔唑单元的三元共聚物TPSBCz-3占25重量%，C71-PCBM占75重量%，在AM 1.5光谱照射下，其功率转换效率为0.86%，开路电压为0.59 V，短路电流为4.85 mA，填充因子为0.30。我们的研究结果表明，咔唑浓度低的三元共聚物由于咔唑单元的空穴迁移率增强效应，导致短路电流提高，从而具有高功率转换效率。
