Research On Performance Enhancements Of Organic/Silicon Hybrid Photovoltaic Solar Cells

Following the development goals of high efficiency and low cost around the photovoltaic energy field,increasingly diverse solar cells have emerged and continue to break through higher power conversion efficiencies(PCE).Organic/silicon hybrid solar cells have become one of the research hotspots in recent years due to the advantages of organic materials and crystalline silicon materials.However,the current PCE of organic/silicon hybrid solar cells is far less than that of crystalline silicon solar cells.In this work,we focus on the contradiction between charge extraction and light absorption of the most promising PEDOT:PSS/Si hybrid solar cell in organic/silicon hybrid solar cells.We conducted research from three parts:PEDOT:PSS film performance improvement,surface grid electrode design,and the effect of the silicon surface light trapping structure on solar cell light absorption and electrical parameters,so that the performance of solar cells has been significantly enhanced.The specific research content includes the following three aspects:Firstly,by embarking on the two aspects of conductivity optimization and optical matching of PEDOT:PSS film simultaneously,the film conductivity was increased to more than 1200 S/cm by adding 5 wt%DMSO,and the square resistance of PEDOT:PSS film was reduced to 100 ?/sq,which reduces the series resistance and improves the fill factor of the solar cells effectively and also ensures a very reasonable film thickness,so that the solar cells has a good optical response.Subsequently,based on the optimization of conductivity and film thickness,the optical and electrical losses caused by the grid electrode on the surface of the hybrid solar cell were analyzed,and a detailed grid electrode loss model was established.The model was used to calculate and optimize the traditional Layout size parameters and design a new type of grid electrode,the experimental results prove the reliability of the theoretical model,the optimal new layout of the grid electrode PEDOT:PSS/Si hybrid solar cell has the lowest series resistance and the short-circuit current density achieves an energy conversion efficiency of 10.0%,which is a nearly 15%relative increase compared to the optimal traditional layout electrode.Finally,the surface light trapping structure prepared by wet etching is used to effectively increase the absorption of c-Si to incident light.The results show that PEDOT:PSS has a better conformal contact with the periodic curved surface structure than with the random pyramid structure,thus the periodic curved surface structure has a more excellent performance improvement.At last,the PEDOT:PSS/Si hybrid solar cell using the periodic curved surface structure achieves an PCE of 13.0%.