Back to Search
Start Over
Facile surface homojunction reconstruction in halide perovskite solar cells.
- Source :
-
Journal of Alloys & Compounds . Sep2022, Vol. 916, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- 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 PbI 2 -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. [Display omitted] • A facile surface homojunction reconstruction is achieved by solvent treatment. • A PbI 2 -rich perovskite surface is induced by the remove of excess FAI. • The reconstructed n/n+ homojunction brings about the enlarged built-in electric field. • The reconstructed n/n+ homojunction contributes to improved photovoltaic efficiency. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 916
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 157119911
- Full Text :
- https://doi.org/10.1016/j.jallcom.2022.165442