Unveiling the effect of potassium treatment on the mesoporous TiO.sub.2./sub./ perovskite interface in perovskite solar cells

0549982 - FZÚ 2022 RIV US eng J - Journal Article
Amalathas, A.P. - Landová, Lucie - Ridzoňová, Katarína - Horák, L. - Bauerová, P. - Holovský, Jakub
Unveiling the effect of potassium treatment on the mesoporous TiO₂/ perovskite interface in perovskite solar cells.
ACS Applied Energy Materials. Roč. 4, č. 10 (2021), s. 11488-11495. ISSN 2574-0962
Institutional support: RVO:68378271
Keywords : perovskite solar cells * mesoporous TiO₂ * interface passivation * sub-band-gap absorption * nonradiative recombination
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6.959, year: 2021
Method of publishing: Limited access
https://doi.org/10.1021/acsaem.1c02229

A method for improving mesoporous TiO2/perovskite interfacial characteristics in perovskite solar cells (PSCs) is demonstrated by modifying mesoporous TiO2 with potassium (K) treatment. It is found that the modification of mesoporous TiO2 with K treatment enhances the perovskite crystallization process, producing a perovskite film with higher crystallinity and larger grains. K treatment passivates trap sites in mesoporous TiO2 and reduces sub-band-gap deep defect states at the interface of the perovskite, thereby suppressing the nonradiative recombination and improving Voc of PSCs. Stronger photoluminescence quenching and shorter carrier lifetime are also observed for the perovskite on K-treated mesoporous TiO2, indicating more efficient charge collection across the interface. As a result of these advancements, PSC based on K-treated mesoporous TiO2 shows a high power conversion efficiency of 20.60% compared to PSC without K treatment and improves the environmental stability in air.
Permanent Link: http://hdl.handle.net/11104/0325866