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Impact of Photoluminescence Reabsorption in Metal‐Halide Perovskite Solar Cells
Author(s) -
Wang Mingcong,
Wang Kai,
Gao Yajun,
Khan Jafar I.,
Yang Wenchao,
De Wolf Stefaan,
Laquai Frédéric
Publication year - 2021
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202100029
Subject(s) - photoluminescence , halide , perovskite (structure) , spectroscopy , chemistry , equivalent series resistance , metal , diode , analytical chemistry (journal) , materials science , optoelectronics , inorganic chemistry , crystallography , physics , organic chemistry , chromatography , quantum mechanics , voltage
The precise quantification of the impact of photoluminescence reabsorption (PLr) in metal‐halide perovskite solar cells (PSCs) remains challenging. Herein, the PLr effect is examined by combined time‐resolved photoluminescence (TRPL) spectroscopy and time‐resolved terahertz spectroscopy (TRTS) and a model is proposed that relates both, the PLr and nonradiative recombination rate ( k nr ) to the quasi‐Fermi‐level splitting (QFLS). PLr is shown to be beneficial for QFLS when the nonradiative recombination rate ( k nr ) is below a critical value of ≈7 × 10 5 s −1 ; at high k nr PLr is detrimental to QFLS. By incorporating PLr into a two‐diode model that allows extraction of the effective k nr , the series resistance ( r s ), and the shunt resistance ( r sh ) in PSCs, it is found that neglecting PLr overestimates the effective k nr , although it does not affect the value of r s and r sh . The findings herein provide insight into the impact of the PLr effect on metal‐halide PSCs.