物理化学学报2025，Vol.41Issue(3)：127-136,10.DOI:10.3866/PKU.WHXB202407025
NbSe2纳米片优化钙钛矿太阳能电池的埋底界面
NbSe2 Nanosheets lmproved the Buried lnterface for Perovskite Solar Cells
摘要
Abstract
Organic-inorganic metal halide perovskite solar cells(PSCs)are favorable candidates for next-generation solar cells,due to their excellent photovoltaic performance and promising low-cost fabrication process.Particularly,tin oxide(SnO2),with excellent charge mobility and extraction efficiency,is widely used as electron transport layers(ETLs),and the efficiency of the corresponding n-i-p-type perovskites has been certified as high as 26.21%in single-junction devices.The SnO2 layer serves as the substrate for the growth of perovskite films,determining the crystalline quality and the buried interface of perovskite films.However,due to the different thermal expansion coefficient of SnO2 and perovskite,the subsequent perovskite annealing process leads to the residual stress at the buried interfaces and lattice distortion in the perovskite films,which seriously affects their optoelectronic performance and stability.To release this interfacial stress,researchers have made some progress by applying different polymers and small molecules to the SnO2/perovskite interface as a buffer layer.Among these,two-dimensional(2D)nanosheets with high carrier mobility,a wide bandgap range,and excellent optical absorption properties are promising,especially 2D NbSe2 nanosheets showing the advantages of solution-processability,high intrinsic conductivity and clean smooth surface,namely without dangling bonded atoms.Herein,2D NbSe2 nanosheets have been introduced at the SnO2/perovskite interface to release the undesired residual tensile strain in perovskite films and to form a more matched interfacial energy level alignment.As a result,we have obtained a high-quality perovskite film and further an improved photovoltaic performance.The PCE has been increased from 21.81%to 24.05%.The unencapsulated cell maintained 91%of the initial efficiency after aging over 1000 h under atmospheric condition.关键词
钙钛矿太阳能电池/二维材料/应变释放/能级排列Key words
Perovskite solar cells/Two-dimensional material/Strain relief/Cascade energy alignment分类
化学化工引用本文复制引用
董鹏宇,刘俊明,高进伟,姜月,杨正池,刘立城,李固,文鑫洋,王祯,施信波,周国富..NbSe2纳米片优化钙钛矿太阳能电池的埋底界面[J].物理化学学报,2025,41(3):127-136,10.基金项目
The project was supported by National Natural Science Foundation of China(52472193,62105124),the Guangdong Basic and Applied Basic Research Foundation(2022A1515010264,2022B1515120006),the Science and Technology Programs of Guangzhou(202201000008),and the China Postdoctoral Science Foundation(2022M721215). 国家自然科学基金(52472193,62105124),广东省基础与应用基础研究基金(2022A1515010264,2022B1515120006),广州市科技计划(202201000008),中国博士后科学基金(2022M721215)资助项目 （52472193,62105124）
