A New BDT-Based Conjugated Polymer with Donor-Donor Composition for Bulk Heterojunction Solar Cells

作者：Ha Yeon Hee; Lee Ji Eun; Hwang Moon Chan; Kim Yu Jin; Lee Joon Hwa; Park Chan Eon; Kim Yun Hi

来源：Macromolecular Research, 2016, 24(5): 457-462.

DOI：10.1007/s13233-016-4047-z

• organic solar cells
• polymer solar cells
• bulk heterojunction solar cells
• conjugated polymer

We present the synthesis and photovoltaic application of a conjugated polymer, PBDT-KTBDT, composed of two benzo[1,2-b:4,5-b']dithiophene (BDT)-based units. In detail, PBDT-KTBDT is composed of alkoxy-substitued BDT units as the electron donating groups and alkylcarbonythienyl-substitued BDT units as the electron withdrawing moieties. The proposed polymer exhibits good solubility, sufficient thermal stability, moderate UV-vis absorption wavelength and energy levels. Solution-processed organic solar cells were fabricated using PBDT-KTBDT as an electron donor and PC71BM as an electron acceptor, and a power conversion efficiency of 1.50% was obtained. Our results reveal that the copolymer with donor-donor composition is a viable candidate as a semiconductor in OPVs, and it is possible to further improve solar cells through more extensive research on these two BDT units-based materials.

• 出版日期2016-5