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High efficiency ETM-free perovskite cell composed of CuSCN and increasing gradient CH3NH3PbI3
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To enhance device performance and reduce fabrication cost,a series of electron transporting material(ETM)-free perovskite solar cells(PSCs)is developed by TCAD Atlas.The accuracy of the physical mode of PSCs is verified,due to the simulations of PEDOT:PSS-CH3NH3PbI3-PCBM and CuSCN-CH3NH3PbI3-PCBM p-i-n PSCs showing a good agreement with experimental results.Different hole transporting materials(HTMs)are selected and directly combined with n-CH3NH3PbI3,and the CuSCN-CH3NH3PbI3 is the best in these ETM-free PSCs.To further study the CuSCN-CH3NH3PbI3 PSC,the influences of back electrode material,gradient band gap,thickness,doping concentration,and bulk defect density on the performance are investigated.Energy band and distribution of electric field are utilized to optimize the design.As a result,the efficiency of CuSCN-CH3NH3PbI3 PSC is achieved to be 26.64%.This study provides the guideline for designing and improving the performances of ETM-free PSCs. 相似文献
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