Conversion Efficiency Of Strained Wurtzite ZnSnN₂/In_xGa_1-xN Cylindrical Quantum Dot Solar Cells And Effects Of Hydrostatic Pressure

Based on the detailed balance theory,the conversion efficiency of ZnSnN₂/In_xGa_1-xN cylindrical quantum dot solar cells was studied theoretically by using the effective mass approximation and the variational principle.Firstly,the conversion efficiency of wurtzite ZnSnN₂/In_xGa_1-xN cylindrical quantum dot solar cells was calculated considering the effect of multiple exciton generation.The numerical results show that the conversion efficiency of solar cells increase with the increase of radius,height and In component of quantum dot,and finally tends to be flat gradually.Moreover,the effect of radius of quantum dot on the conversion efficiency of solar cells are greater than that of height.In addition,the multiple exciton generation effect can significantly improve the conversion efficiency of solar cells when the size of quantum dot is large.Secondly,the conversion efficiency of strained wurtzite ZnSnN₂/In_xGa_1-xN cylindrical quantum dot solar cells under the influence of built-in electric field and hydrostatic pressure was studied,respectively.The results show that the built-in electric field can significantly reduce the conversion efficiency of solar cells,and the effect is obvious when the quantum dot size is large;Selecting the appropriate component group distribution ratio can also reduce the influence of built-in electric field,so as to further improve the conversion efficiency of solar cells.The conversion efficiency of solar cells will be significantly improved under hydrostatic pressure.The difference is that the increase of the height of quantum dot will make the conversion efficiency gap of solar cells under different pressures gradually increase,while the increase of the radius of quantum dot will make the conversion efficiency gap of solar cells under different pressures smaller and smaller.