Interfacial Voids Trigger Carbon-Based, All-Inorganic Cs Pb IBr2 Perovskite Solar Cells with Photovoltage Exceeding 1.33 V

查看全文 作　　者：Weidong [1]Zhu;Zeyang [1]Zhang;Dandan [2]Chen;Wenming [1]Chai;Dazheng [1]Chen;Jincheng [1]Zhang;Chunfu [1]Zhang;Yue [1]Hao

机构地区：[1]State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology and Shaanxi Joint Key Laboratory of Graphene,School of Microelectronics,Xidian University,Xi’an 710071,People’s Republic of China;[2]College of Science,Xi’an Shiyou University,Xi’an 710065,Shaanxi,People’s Republic of China

出　　处：《Nano-Micro Letters》索引2020年第12卷第7期,共14页

基　　金：financial support from the National Natural Science Foundation of China(Nos.61804113,61874083);Initiative Postdocs Supporting Program(BX20190261);the National Natural Science Foundation of Shaanxi Province(2018ZDCXL-GY-08-02-02 and 2017JM6049);the Fundamental Research Funds for the Central Universities(JB181107 and JBX171103). 摘　　要：A novel interface design is proposed for carbon-based,all-inorganic CsPbIBr2 perovskite solar cells(PSCs)by introducing interfacial voids between TiO2 electron transport layer and CsPbIBr2 absorber.Compared with the general interfacial engineering strategies,this design exempts any extra modification layer in final PSC.More importantly,the interfacial voids produced by thermal decomposition of 2-phenylethylammonium iodide trigger three beneficial e ects.First,they promote the light scattering in CsPbIBr2 film and thereby boost absorption ability of the resulting CsPbIBr2 PSCs.Second,they suppress recombination of charge carriers and thus reduce dark saturation current density(J0)of the PSCs.Third,interfacial voids enlarge built-in potential(Vbi)of the PSCs,awarding increased driving force for dissociating photo-generated charge carriers.Consequently,the PSC yields the optimized e ciency of 10.20%coupled with an open-circuit voltage(Voc)of 1.338 V.The Voc achieved herein represents the best value among CsPbIBr2 PSCs reported earlier.Meanwhile,the non-encapsulated PSCs exhibit an excellent stability against light,thermal,and humidity stresses,since it remains^97%or^94%of its initial e ciency after being heated at 85℃for 12 h or stored in ambient atmosphere with relative humidity of 30–40%for 60 days,respectively. 关键词：All-inorganic PEROVSKITE solar cells Cs PB IBr2 PHOTOVOLTAGE INTERFACIAL engineering Stability

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Interfacial Voids Trigger Carbon-Based, All-Inorganic Cs Pb IBr2 Perovskite Solar Cells with Photovoltage Exceeding 1.33 V

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