Moisture Uptake Relaxes Stress in Metal Halide Perovskites at the Expense of Stability DOI
Gabriel R. McAndrews, Boyu Guo, Samantha C. Kaczaral

et al.

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(8), P. 4153 - 4161

Published: July 30, 2024

Previous studies have shown that the degradation rate of metal halide perovskites in an ambient atmosphere increases with amount tensile stress, which primarily arises from coefficient thermal expansion mismatch substrate. In this work, we show first evidence stress relaxation perovskite films resulting moisture uptake. Indeed, for multiple compositions observe tension relaxes rapidly conditions, as compared to inert quartz crystal microbalance measurements showing a mass density increase on similar time scale indicative The uptake at free surfaces, including grain boundaries, can reduce constrained film, how adatom diffusion reduces residual following thin film formation. Unfortunately, catalyze other mechanisms such PbI2 formation or transition nonperovskite structural phase. Stress-induced is especially important problem all-inorganic because they are annealed much higher temperatures, causing high stress. It explains unusually poor stability these perovskites. Using diethyl ether antisolvent bath attach CsPbI2Br substrate lower temperature, reduced initial strain 0.43 ± 0.04% 0.12 0.05%, thus reducing driving force and improving its phase by over factor 15.

Language: Английский

Thermal stability test on flexible perovskite solar cell modules to estimate activation energy of degradation on temperature DOI Creative Commons
Abdurashid Mavlonov, Yoshihiro Hishikawa,

Yu Kawano

et al.

Solar Energy Materials and Solar Cells, Journal Year: 2024, Volume and Issue: 277, P. 113148 - 113148

Published: Sept. 2, 2024

The thermal stability of methylammonium lead iodide (MAPbI3)-based flexible perovskite solar cell (PSC) modules was studied. For this purpose, PSC modules, consisting 10 serially connected cells with an aperture area 9 cm2, were heated at 85 °C, 95 and 105 °C for 4000 h. parameters periodically measured by interrupting the tests. Evolution series resistance, short circuit current, fill factor showed monotonic reduction, whereas shunt resistance open voltage depicted three stage degradation: (i) initial rapid degradation; (ii) quasi stable range; (iii) gradual degradation stages, which are indication presence several mechanisms. Using Arrhenius model, activation energy (Ea) Ea 1.062 eV (102.5 kJ/mol) obtained maximum output total device. Device lifetime stability, is defined as point where efficiency has reduced to 80 % its value, also estimated module temperature 45 °C.

Language: Английский

Citations

10
In Situ Film Stress Measurements Capture Increased Photostability in Additive-Engineered Mixed-Halide Perovskites DOI
Muneeza Ahmad,

Erin Burgard,

M DODD

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

Mixed-halide perovskites segregate into iodide- and bromide-rich phases under light have limited long-term reliability. We report for the first time on mechanical instability originating from illumination, which is monitored through thin-film stress measurements, both ex situ in situ. show that low-cost polymer additives, namely, corn starch polyvinylpyrrolidone, not only induce a desirable compressive intrinsic thin film but also suppress photoactivated phenomenon. The additives no significant changes photoluminescence (PL) responses when perovskite films are illuminated ambient conditions. controlled real-time monitoring of relative quantifies durability 1 sun illumination cycles. therefore demonstrate facile route to photostable mixed-halide using scalable deposition technique with quench-free processing nontoxic additives.

Language: Английский

Citations

0
Moisture Uptake Relaxes Stress in Metal Halide Perovskites at the Expense of Stability DOI
Gabriel R. McAndrews, Boyu Guo, Samantha C. Kaczaral

et al.

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(8), P. 4153 - 4161

Published: July 30, 2024

Previous studies have shown that the degradation rate of metal halide perovskites in an ambient atmosphere increases with amount tensile stress, which primarily arises from coefficient thermal expansion mismatch substrate. In this work, we show first evidence stress relaxation perovskite films resulting moisture uptake. Indeed, for multiple compositions observe tension relaxes rapidly conditions, as compared to inert quartz crystal microbalance measurements showing a mass density increase on similar time scale indicative The uptake at free surfaces, including grain boundaries, can reduce constrained film, how adatom diffusion reduces residual following thin film formation. Unfortunately, catalyze other mechanisms such PbI2 formation or transition nonperovskite structural phase. Stress-induced is especially important problem all-inorganic because they are annealed much higher temperatures, causing high stress. It explains unusually poor stability these perovskites. Using diethyl ether antisolvent bath attach CsPbI2Br substrate lower temperature, reduced initial strain 0.43 ± 0.04% 0.12 0.05%, thus reducing driving force and improving its phase by over factor 15.

Language: Английский

Citations

3