Research And Application Of Numerical Simulation Microcrystalline Silicon Heterojunction Solar Cells

Solar energy is an inexhaustible clear energy. How to convert solar energyinto any other inexhaustible new energies to solve the energy crisis of humanbeing? Solar cell becomes the key technology. The crystalline silicon solar cellis used much more today. the battery market competitiveness of which is notstrong, however, due to increased costs and low conversion efficiency. Althoughthin-film battery can solve those problems well, it also could not make the solarwidely used, because of light-induced degradation. Heterojunction solar cell hasa good structure and possesses the advantages of the two kinds of cellsmentioned above. Microcrystalline silicon has continuously tunable band gapand a wide range of spectral response. Hence it is very suitable forheterojunction solar cells. Therefore, it is necessary to use numerical siulation tostudy the application of microcrystalline silicon in heterojunction solar cellls.This article selects afors-het software to simulate the effect of uc-si backsurface field on the solar cell at different operation temperatures. The resultsshow that the open circult voltage and conversion efficiency increase in differentdegrees when the band gap of the battery back surface field increases. The opencircult voltage of battery, fill factor and conversion efficiency improveconstantly with the increasing of doping concentration of back field. And thecell performance declines with the growing of back field thickness. Thecorresponding doping concentration and material thickness change a little whenthe temperature rises. The corresponding band gap trends toward right obviouslywhen the battery operation temperature rises. Using the same software simulatesthe effect of uc-si window layer on cell performance under different operationtemperatures. The results show that the transformation efficiency first increasesand then decreases and the open circult voltage increases with the growth ofmicrocrystallline silicon band gap of window layer. The battery performanceincreases at first and then declines when the doping concentration increases. Thebattery performance overall trends downward when the thickness increases. Thecorresponding thickness and doping concentration of microcrystalline silicon window layer trends to move left significantly with the increasing of thebattery operation temperature. However, the corresponding optimal band gapincreases obviously.