基于表面原位重构策略的高效全无机钙钛矿太阳能电池（英文）
作者单位：鲁东大学
会议名称：《第四届全国太阳能电池材料与器件大会》
会议日期：1000年
学科分类：08[工学] 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 PSCs surface in-situ reconstruction nonradiative recombination graded heterojunction Voc loss
摘 要：All-inorganic perovskites are emerging as excellent photovoltaic candidate for single junction or tandem solar cells. However, large energy loss due to nonradiative recombination is the main constraints for performance enhancement. Accordingly, we developed a surface in-situ reconstruction（SISR） strategy for inorganic perovskite by Cs F treatment, which can suppress nonradiative recombination and promote hole extraction simultaneously. Surface defects can be effectively passivated by the introduced fluorine and carrier lifetime was prolonged from 11.5 ns to 737.2 ns. In addition, a wider bandgap perovskite layer can be generated as graded heterojunction to facilitate hole extraction. The SISR reaction mechanism was also verified from both kinetic calculations and experiments. As a result, CsPbIBr solar cell with SISR achieved an efficiency of 21.02% with a high open circuit voltage of 1.27 V and fill factor of 85.3%. This work provides an effective approach to modulate inorganic perovskite surface for design efficient solar cells.