Lead halide residue as a source of light-induced reversible defects in hybrid perovskite layers and solar cells

0520317 - FZÚ 2020 RIV US eng J - Journal Article
Holovský, Jakub - Amalathas, A.P. - Landová, Lucie - Dzurňák, B. - Conrad, B. - Ledinský, Martin - Hájková, Zdeňka - Pop-Georgievski, Ognen - Svoboda, Jan - Yang, T.C.J. - Jeangros, Q.
Lead halide residue as a source of light-induced reversible defects in hybrid perovskite layers and solar cells.
ACS ENERGY LETTERS. Roč. 4, č. 12 (2019), s. 3011-3017. ISSN 2380-8195. E-ISSN 2380-8195
R&D Projects: GA ČR GJ17-26041Y
Grant - others:OPPK(XE) CZ.2.16/3.1.00/21545
Program: OPPK
Institutional support: RVO:68378271 ; RVO:61389013
Keywords : perovskite * X ray photoelectron spectroscopy * perovskite solar cells
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Polymer science (UMCH-V)
Impact factor: 19.003, year: 2019
Method of publishing: Limited access
https://doi.org/10.1021/acsenergylett.9b02080

Advanced characterization methods avoiding transient effects in combination with solar cell performance monitoring reveal details of reversible light-induced perovskite degradation under vacuum. A clear signature of related deep defects in at least the 1 ppm range is observed by low absorptance photocurrent spectroscopy. An efficiency drop, together with deep defects, appears after minutes-long blue illumination and disappears after 1 h or more in the dark. Systematic comparison of perovskite materials prepared by different methods indicates that this behavior is caused by the lead halide residual phase inherently present in material prepared by the two-step method. X-ray photoelectron spectroscopy confirms that lead halide when illuminated decomposes into metallic lead and mobile iodine, which diffuses into the perovskite phase, likely producing interstitial defects. Single-step preparation, as well as preventing lead halide illumination, eliminates this effect.

Permanent Link: http://hdl.handle.net/11104/0305003