Healing the Defective Surface for High-Efficiency and Stable All-Inorganic Perovskite Solar Cells
作者单位：Institute of New Energy TechnologyCollege of Information Science and TechnologyJinan University
会议名称：《第八届新型太阳能材料科学与技术学术研讨会》
会议日期：2021年
学科分类：08[工学] 080501[工学-材料物理与化学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
关 键 词：All-inorganic perovskite solar cell Strain release Charge extraction Long-term stability
摘 要：The importance of controlling interface energetics is gradually ascensive owing to the soft nature of perovskite lattice, which induces substantial defects and energy barrier for charge recombination within a PSC. With the aim to effectively heal the defective surface, we have conducted the interface engineering by incorporating 2 D materials into the allinorganic perovskite solar cells(PSCs). Arising from the fabrication of WS/CsPbBr van der Waals heterostructure(playing a role of lubricant between ETL and perovskite), the tensile strain in the perovskite film is released for a uniform perovskite with low defect density and high activation energy for ion migration, which significantly improves the device voltage up to 1.70 V for CsPbBr PSC. In addition, p-type charge transfer doped(NiCo) Fe O-GO is further employed as an excellent hole booster owing to the spontaneous electron transfer from edged oxygencontaining functional groups to(NiCo)FeO. As a result, the inorganic CsPbIBr2 PSC presents the highest efficiency of 10.95% in corresponding carbon-electrode based devices under one standard sun owing to the eliminated paradox between charge extraction and charge localization in GO surface.