首页|Facile surface homojunction reconstruction in halide perovskite solar cells
Facile surface homojunction reconstruction in halide perovskite solar cells
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
Perovskite solar cells (PSCs) have attracted great attentions due to their excellent photovoltaic performance. Further improvement of device efficiency is limited by the recombination of the charge carriers even a heterojunction-based architecture is employed. Herein, we discovered that a simple surface modification of the perovskite film by incorporating isopropyl alcohol (IPA) post-treatment could convert the top surface to be more n-type, which spontaneously formed an n/n(+) homojunction between the bulk (weak n type (n)) and the surface (more n-type (n(+))) in a single perovskite film. A reconstruction toward a PbI2-rich top surface was induced by the remove of excess formamidinium iodide dissolved in a polar solvent IPA. This reconstructed n/n(+) homojunction lead to the enlarged built-in electric field for efficient charge separation and transport of the photogenerated carriers. The inverted PSCs with the reconstructed n/n+ homojunction contribute to improve efficiency and narrow their efficiency gap with conventional n-i-p type devices. Our result suggests that the homojunction structure is an effective approach to reduce carrier recombination loss and achieve highly efficient PSCs. (C) 2022 Elsevier B.V. All rights reserved.
Perovskite solar cellsHomojunctionPost-treatmentPbI2HIGH-EFFICIENCYPERFORMANCECH3NH3PBI3INTERFACEPHASELAYER
NSTL
Elsevier
