【摘 要】
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The perovskite solar cells have been intensively investigated these years due to their premium electrical and optical properties as well as huge potential for application.In order to further increase the power conversion efficiency(PCE)of the thin film pe
【机 构】
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State Key Laboratory for Mesoscopic Physics and Department of Physics,Peking University,Beijing 1008
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The perovskite solar cells have been intensively investigated these years due to their premium electrical and optical properties as well as huge potential for application.In order to further increase the power conversion efficiency(PCE)of the thin film perovskite solar cells,light man-agement should be taken into consideration.Herein,we apply a lithography method to transfer randomly dis-tributed polystyrene(PS)nanospheres into the electron transporting SnO2 layer,by means of which,a nanoholes structure is formed.Finally,we get a nanostructured per-ovskite layer under low temperature(less than 150℃).The depth of SnO2 nanoholes is around 60 nm when the device is fabricated with 300-nm PS,and 150 nm in depth when 500-nm PS is used.The device gains PCE of 17.97％,which is 12.3％higher than that with planar electron-transporting SnO2 layer and 300-nm CH3NH3PbI3 layer.Our findings provide an applicable method to improve the light absorption,which can not only make the absorbing layer of lead-based perovskite solar cells thinner to help decrease the content of lead,but also increase the PCE of non-lead perovskite devices.
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