# Fileset

[Poster-JPVS-2025-DEEP-NIMS.pdf](https://mdr.nims.go.jp/filesets/dd24699a-aae4-428f-a822-a4f0e8a730d5/download)

## Creator

SINGH Deep, [KHADKA Dhruba Bahadur](https://orcid.org/0000-0001-9134-3890), [YANAGIDA Masatoshi](https://orcid.org/0000-0002-8065-7875), Sudhanshu Mallick, [SHIRAI Yasuhiro](https://orcid.org/0000-0003-2164-5468)

## Rights

[In Copyright](http://rightsstatements.org/vocab/InC/1.0/)

## Other metadata

[Investigation Of Degradation of Perovskite Solar Cell Using Analytical Drift Diffusion Model](https://mdr.nims.go.jp/datasets/4fdf7ecb-a8a8-4830-be4f-6191ed82d609)

## Fulltext

Investigation of Degradation of Perovskite Solar Cell using Analytical Drift Diffusion ModelSingh D., Khadka B. D.,* Yanagida M., Mallick S., and  Shirai Y. National Institute for Materials Science, Tsukuba, Japan; Indian Institute of Technology Bombay, Mumbai, IndiaThe Power conversion efficiency (PCE) of a Perovskite solar cell (PSC) declines during operation with time. The cause of the deterioration of perovskite solar cells is the instability of the perovskite crystal, induced by external factors, such as humidity, heat, light, and electric field. To understand the degradation, a simulation based on an analytical and numerical model is performed. • In analytical model-based simulation, degradation is considered a function of surface recombination velocity. • In numerical simulation based on the drift diffusion model, the degradation is considered as a function of ion density.IntroductionDevice Structure and Ageing References1. D. B. Khadka, et al. ACS Appl Energy Mater, 2021, 4, 11121–11132.2. C. C. Boyd, et al. Chem Rev, 2019, 119, 3418–3451.3. X. Sun, et al. 2015, 5, 1389–1394.4. A. Matsushita, et al. Solar Energy Materials and Solar Cells, 2021, 220, 110854.5. W. Clarke, et al. J Comput Electron, 2023, 22, 364–3826. D. B. Khadka, et al. Solar Energy Materials and Solar Cells, 2022, 246, 111899.7. M. Diethelm, et al. Energy Environ Sci, 2025, 18, 1385–1397.8. D. B. Khadka et al. J. Mater. Chem. C, 6, 162, 2018.Conclusion• Surface recombination leads to charge carrier loss, accelerating cell degradation over time and with temperature.• Impedance spectra show that higher-frequency components play a larger role in degraded solar cells.• Low ion density minimizes low-frequency contributions in impedance spectra.• Impedance changes reveal how ion density impacts charge transport and recombination in PSCs.Results and DiscussionThis research was conducted under the International Cooperative Graduate Program (ICGP) of the National Institute for Materials Science (NIMS), Japan, and the authors acknowledge the support of the Hitachi Foundation, Kurata grant.E-mail： * KHADKA.B.Dhruba@nims.go.jp  Devices using PTAA as the HTL achieved a higher initial efficiency compared to NiOX, but PTAA device degraded significantly more with increasing temperatureDrift diffusion simulation>> Impedance spectra showing the effect of the Effective valence band DoS in HTL. The negative hook indicates strong ionic interactions with the surface. Drift diffusion simulationJV characteristics/ corresponding impedance spectra. >>A reduction in recombination velocity and an increase in carrier lifetimes suggest improved charge carrier dynamics RV= 20 cm/sτn = 3 × 10-9 sτp = 3 × 10-8 sRV= 15 cm/sτn = 3 × 10-6 sτp = 3 × 10-5 sNiOX  device PCE =15.74%PTAA device PCE =18.76% Operational stability of PSCs with PTAA >>Analysis of aged J-V curves using an analytical model>>>Higher surface recombination velocities with aging>>> faster degradation under heat and light stress STEM cross-sectional images of fresh (a, b) and aged (light and thermal stress Slide 1