《Table 1.Performance comparison of PSCs without or with different interlayers.》

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《Solution processed nano-ZnMgO interfacial layer for highly efficient inverted perovskite solar cells》

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The concentration of ZnMgO solution was carefully optimized and device champion efficiencies have been summarized in Table S1.All devices were measured under AM 1.5 simulated sunlight irradiation and the device with ZnMgO layer deposited in 5 mg mL–1exhibited a best champion efficiency，with a Vocof 0.91 V，a Jscof22.71 mA cm–2，a FF of 0.75，and a PCE of 15.61%.It is remarkable that the Voccan keep stable with the increased concentration of Zn Mg O.However，the improvements in FF are obvious and the enhancements in Jscare slight when the concentration of ZnMgO increased from 0 mg mL–1to 5 mg mL–1，leading to the PCE increased hugely in that range.With the concentration excess 5 mg mL–1of ZnMgO，a relative stable FF and a slight reduced Jsccaused the decrease in PCE.The slight decrease in Jscmay be caused by the hinder electron transport with too thick ZnMgO layer，which is relation to the higher conduction band of ZnMgO layer（–3.2 eV）than the lowest unoccupied molecular orbital（LUMO）of PC61BM（–3.9 eV）.