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Comparison of surface-passivation ability of the BAI salt and its induced 2D perovskite for high-performance inverted perovskite solar cells

Organic–inorganic lead halide perovskite solar cells have shown a rapid increase in power conversion efficiency (PCE) in the past decade. However, their performance still suffers from trap-assisted decline due to defects at the surface and grain boundaries in the polycrystalline active layer. In thi...

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Detalles Bibliográficos
Autores principales: Zhang, Hanhong, Wang, Song, Hou, Youzheng, Zhang, Fan, Hao, Yuying, Song, Jun, Qu, Junle
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9036553/
https://www.ncbi.nlm.nih.gov/pubmed/35479816
http://dx.doi.org/10.1039/d1ra02260a
Descripción
Sumario:Organic–inorganic lead halide perovskite solar cells have shown a rapid increase in power conversion efficiency (PCE) in the past decade. However, their performance still suffers from trap-assisted decline due to defects at the surface and grain boundaries in the polycrystalline active layer. In this study, a thin BAI layer was formed on the CH(3)NH(3)PbI(3) surface, which was then transformed into either a two-dimensional (2D) perovskite layer (BA(2)PbI(4)) or the organic salt itself by controlling the post-annealing process. A variety of characterization results show that the 2D perovskites could effectively reduce the trap-assisted charge recombination and increase the device stability. Therefore, a remarkably enhanced PCE of 20.6% was achieved in the modified inverted perovskite solar cells.