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Letterpubs.acs.org/journal/apchd5SequentialDepositionofCHNHPbIonPlanarNiOFilmforEfficient333PlanarPerovskiteSolarCellsLongHu,†,‡JunPeng,§WeiweiWang,§ZheXia,†,‡JianyuYuan,§JialingLu,§XiaodongHuang,§WanliMa,*,§HuaibingSong,†,‡WeiChen,†Yi-BingCheng,†,∥andJiangTang*,†,‡†WuhanNationalLaboratoryforOptoelectronics(WNLO)and‡SchoolofOpticalandElectronicInformation,HuazhongUniversityofScienceandTechnology,Wuhan,Hubei430074,China§InstituteofFunctionalNano&SoftMaterials(FUNSOM),SoochowUniversity,Suzhou,Jiangsu215123,China∥DepartmentofMaterialsEngineering,MonashUniversity,WellintonRoad,Clayton,Victoria3800,AustraliaABSTRACT:Thenewemergingorganometaltrihalideperovskiteholdsgreatpotentialforhigh-efficiency,low-costsolarcellsbecauseofitshighsolartoelectricityconversationefficiency(>16%)achievedwithin4yea