Fully Printed High-efficiency All-inorganic Perovskite Solar Cells In The Atmosphere

All-inorganic perovskites have recently attracted enormous attention for thin-film solar cells due to its excellent thermal stability and optoelectronic properties.However,crystallization is highly inhibited,and crystals tend to degrade when processing allinorganic perovskites under ambient conditions.Therefore,fabrication of highperformance all-inorganic perovskite solar cells are mostly limited in inert condition,which makes it impossible for high-throughput mass production in ambient conditions in the future for all-inorganic perovskite solar cells and their commercial applications.Herein,to address the above critical issue,this thesis has done works as following:1.Air-flow assisted blade-coating technique was developed to fabricate high-quality CsPbI2Br perovskite films in ambient conditions.We found that air-flow accelerates solvent volatilization and reduces moisture interference in ambient conditions during the crystallization process,resulting in smooth,dense,and pinhole-free CsPbI2Br perovskite films.Power conversion efficiencies（PCEs）of solar cells based on ambient blade-coated CsPbI2Br perovskite film reaches 14.64%,which is comparable to devices prepared by the spin-coating technique in inert glove boxes.2.We demonstrate for the first time high-performance fully printable CsPbI3 solar cells under ambient conditions,which were realized via air-flow-assisted blade-coating and insitu passivation.We found that air-flow can help accelerate the crystallization of CsPbI3 and reduce the interference from moisture.A tiny amount of molecular additive Zn（C6F5）2 was further introduced to in-situ passivate defects formed during the rapid crystallization process and to effectively reduce the energy barrier at the perovskite/SnO2 interface.Therefore,we achieved an optimal PCE of 19.00%for fully-printable CsPbI3 solar cells,which is also among the highest values for this type of solar cells.