Thin-film Silicon Solar Cells: Numerical Simulation,efficiency Improvement Experiment And Technical Economy Research

Thin film silicon solar cells have become increasingly popular because of their low cost,flexibility,light weight,and convenience to integrate.Since the atomic structure of the thin film silicon material is more complex than that of the crystalline silicon,and the thin film silicon cells require conductive thin film layers and have a shorter development time than that of crystalline silicon cells.All the factors increase the difficulty of simulating,optimizing thin film silicon cells,and analyzing their technical economics.We utilized the advanced interface-friendly semiconductor device simulation software SILAVCO to carry out equipment simulation.The efficiency of single-junction amorphous silicon,microcrystalline silicon and double-junction silicon cell were simulated.And optimizing the different parameters for different cells and found that:for the amorphous silicon cell,the dangling bond density has an important impact:As the dangling bond density increases,the overall performance of the battery decreases significantly.Since the bandgap of the microcrystalline silicon material changes with the change of the crystallization rate of the material.The amorphous silicon/microcrystalline junction silicon cell model was constructed,and the simulation results show that the semi-reflective layer must be added between the two single junctions to obtain sound J-V curve and cell performance.To further optimize the cells,we carry out experimental research to investigate the back reflector.The efficiency of thin-film silicon cells depends on a variety of factors.A simple and effective way is to make the interface between the TCO and the silicon absorber layer rough,so that it can let light scattering to increase the optical path and improve absorption.Our experiments mainly studied the performance improvement of thin film solar cells with aluminum oxide thin film with ozone-treated sputtered silver layer material as TCO.We found that the appropriate time of hydrochloric acid etching and ozone treatment are effective ways to improve the light scattering properties of the silver back reflective layer.Among them,40s is the optimum chemical etch time,and the ozone treatment 30s is the best time to deal with sputtering silver.These treatments result in the formation of dense Ag₂O particles on the surface of the silver back reflector,increase the roughness of the silver back reflector,thus achieving high haze values.These increases have also been supported by EQE measurements;demonstrating that solar cells have increased the utilization efficiency of solar spectrum.To realize reduction of traditional energy by utilization of the thin film silicon cells and to harness the technology economically,we formed technological,scientific and systematic energy-saving and technical economics analysis for thin film silicon cells.The comprehensive analysis system of thin-film silicon cell technology is based on the analysis of the technology itself.Focusing on China's national conditions,the economic effect,social effect and environmental effect of the technology in the application of the technology have potential research,development and application value.We used the ten major indicators and 27sub indicators to analyze thin-film silicon solar cell technology,and ultimately the technology score of 3.67?total score of 5 points?,which indicates that the technology has a good comprehensive benefit.Thin-film silicon cell technology is worth doing further research and promotion.