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Published on: September 8, 2017
Highly efficient low-bandgap polymer solar cells with solution-processed and annealing-free phosphomolybdic acid as
Xu Jia1, Liang Shen, Mengnan Yao
1State Key Laboratory on Integrated Optoelectronics, ‡College of Electronic Science and Engineering, and §Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University , Changchun 130012, People's Republic of China.
Abstract:
We demonstrate a novel solution-processed method to fabricate a stable anode buffer layer without any annealing process. As we know, buffer layers in polymer solar cells (PSCs) are always prepared by the traditional high-vacuum thermal evaporation or annealing-treated spin-coating methods, but the fabricating processes are complicated and time-consuming. Here, a solution method without any annealing to fabricate phosphomolybdic acid (PMA) as anode buffers is presented, which brings an obvious improvement of power conversion efficiency (PCE) from 1.75% to 6.57% by optimizing the PMA concentrations and interface pretreatment with device structure shown as ITO/TiO2/PCDTBT:PC70BM/PMA/Ag. The improvement is ascribed to the fine energy-level matching and perfect surface modification. This annealing-free method greatly simplifies the device fabrication process and supplies a wide way to achieve a large area fabrication for PSCs.
