Waterborne Acrylic Resin-Modified PEDOT:PSS as a Hole-Transporting Layer for Silicon/Organic Solar Cells with Improved Efficiency and Stability
Lang Jiang, Zheng Zhou, Guijun Zhang, Chenggang Li, Qisong Feng, Qianwen Wei, Jiayang Li, Haixia Wu, Yang Shi, Juan Wang, Yu Yang
Abstract
Si/PEDOT:PSS heterojunction solar cells (HSCs) are of great interest to researchers due to their low cost and simple process, but the hygroscopicity of polymer poly(3,4- ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) leads to poor stability of such devices, limiting the possibility of their further commercialization. In this research, the stability and power conversion efficiency (PCE) of Si/PEDOT:PSS HSCs were improved by doping waterborne acrylic resin (WA) in PEDOT:PSS. The experimental results show that the surface of WA-doped PEDOT:PSS films has successfully changed from hydrophilic to hydrophobic, and the stability of solar cells prepared from these films in the air has been significantly improved. The WA-doped device retains more than 80% of its initial PCE after 200 h of storage in air, whereas the corresponding undoped device has failed. Unlike general research reports, this work also provides stability data of devices at −12, 80, 120 °C, and ultraviolet (UV) illumination, respectively. The results show that the device achieved an optimal PCE of 13.37% when the WA doping concentration was 0.3 wt %; devices with high stability and high PCE are achieved.