Bulk-heterojunction polymer solar cells (PSCs) have attracted great attention in recent years, because of their advantages of low cost fabrication, light weight and flexibility. The key issues in the studies of PSCs are the design and synthesis of high efficiency conjugated polymer donor and fullerene derivative acceptor photovoltaic materials[1]. In this presentation, I will talk about our recent progress on the studies of side chain effect on the photovoltaic performance of the two-dimension (2D)-conjugated copolymer donor materials PBDTTTs based on benzo[1,2-b:4,5-b']dithiophene (BDT) and thieno[3,4-b]thiophene (TT). The 2D-conjugated PBDTTTs with bithienyl conjugated side chains on BDT unit show significantly improved photovoltaic performance than that of the corresponding polymers with alkoxyl side chains on BDT unit.[2,3] The power conversion efficiency (PCE) of the PSC based on the 2D-conjugated PBDTTT-C-T reached 7.59%[2]We further synthesized solution-processable 2D-conjugated organic molecules based on the BDT unit with the bithienyl conjugated side chains, the molecules also demonstrated high photovoltaic performance in the bulk-heterojunction organic solar cells with the molecules as donor.[4] Based on the success of the 2D-conjugated PBDTTTs, we further studied the effect of substituent of the thiophene conjugated side chains on the photovoltaic properties of the 2D-conjugated polymer donors. With appropriate substituent on the thiophene conjugated side chains, the photovoltaic performance of the polymers can be further improved. References: [1] Y. F. Li, Acc. Chem. Res. 2012 , 45, 723.[2] L. J. Huo, S. Q. Zhang, X. Guo, F. Xu,Y. F. Li, J. H. Hou, Angew. Chem. Int. Ed., 2011 , 50, 9697.[3] Y. Huang, X. Guo, F. Liu, L. J. Huo, Y. N. Chen, T. P. Russell, C. C. Han, Y. F. Li, J. H. Hou, Adv. Mater., 2012 , 24, 3383.[4] S. L. Shen, P. Jiang, C. He, J. Zhang, P. Shen, Y. P. Yi, Z. J. Zhang, Z. B. Li, Y. F. Li, Chem. Mater. 2013 , 25, 2274.

Side chain effect on the photovoltaic properties of 2D-conjugated PBDTTTs

247th National Meeting (2014)

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