Improved Photovoltaic Performance of PEDOT:PSS/C-Si Hybrid Solar Cells with an Inverted Structure

In this study, n-type crystalline silicon and organic conjugated polymer PEDOT:PSS were combined to prepare backside Si/PEDOT:PSS hybrid heterojunction solar cells by a low-temperature solution method. This provides a novel approach to reduce the production cost of crystalline Si solar cells and improve device efficiency. To address the issue that the contact performance of PEDOT:PSS film deteriorates due to the pyramidal structure of the Si surface, the contact performance of PEDOT:PSS and Si interface was optimized by using high-speed dual spin-coating technology, and the power conversion efficiencies (PCE) reached 15.91%. To further improve the efficiency, perfluoropolymer Nafion was added to PEDOT:PSS films, and the synergistic effect of the sulfonate groups in Nafion and PSS optimized the passivation properties of the interface between PEDOT:PSS and Si. When the volume ratio of Nafion to PEDOT:PSS was 0.5:1, the PCE of the solar cell was further enhanced, reaching 17.96%.