Improving photovoltaic parameters of all-polymer solar cells through integrating two polymeric donors

作者：An, Kang; Peng, Feng; Zhong, Wenkai; Deng, Wanyuan; Zhang, Difei; Ying, Lei^*; Wu, Hongbin; Huang, Fei; Cao, Yong

来源：Science China Chemistry, 2021, 64(11): 2010-2016.

DOI：10.1007/s11426-021-1078-5

• all-polymer solar cells
• ternary blend
• high performance
• large area device

The incorporation of an additional component into the bulk-heterojunction light-harvesting layer of polymer solar cells has been considered as an effective strategy to enhance photovoltaic performance. Here we demonstrated that the photovoltaic parameters of all-polymer solar cells could be enhanced upon replacing a certain ratio of electron-donating polymer PTzBI-oF with a widely used wide-bandgap polymer donor PM6. The photoluminescent characterizations confirmed the Forster resonance energy transfer from incorporated PM6 to PTzBI-oF. Moreover, the combination of Fourier-transform photocurrent spectroscopy and electroluminescence external quantum efficiencies measurements demonstrated reduced non-radiative recombination energy loss upon the incorporation of PM6, resulting in a slightly enhanced open-circuit voltage of 0.88 V of the ternary cell regarding the binary PTzBI-oF:PFA1 device. The optimized ternary blend devices comprising of PTzBI-oF:PM6:PFA1 presented an impressively high power conversion efficiency of 16.3%, and the efficiency remains 15% on a device with an enlarged effective area of 1 cm(2), demonstrating the great potential of these all-PSCs for potential applications.