Research progress in improving the performance of PEDOT:PSS/Micro- and Nano-textured Si heterojunction for hybrid solar cells

Silicon-based hybrid solar cells (HSCs), especially PEDOT:PSS/Si HSC, have attracted the interest of researchers because they combine the advantages of organic and inorganic materials. A high quality PEDOT:PSS/Si heterojunction is the key to the good performance of PEDOT:PSS/Si HSC. However, as generally requisite to enhance light absorption for HSCs, Si Micro/Nano structures will reduce the interface contact quality between PEDOT:PSS and Si surface. The inferior interface contact quality will limit the separation efficiency of the photogenerated carriers. In this paper, we summarize the research progress in improving the interface contact between Si Micro/Nano structures and PEDOT:PSS film from three aspects: the optimization of Si Micro/Nano structures aimed to improve the fluid properties of PEDOT:PSS solution, the material modification of PEDOT:PSS and interface modification with the purpose to enlarge the heterojunction area and improve the electrical contact, and the specific deposition process of PEDOT:PSS solution developed to achieve the high filling rate of PEDOT:PSS on Si Micro/Nano structures. The insight of this paper is helpful for the preparation of high-quality heterojunction, which is vitally important for the development of high efficiency PEDOT:PSS/Si HSCs.