Title
Evaluation of active layer thickness influence in long-term stability and degradation mechanisms in csfapbibr perovskite solar cells
Author
López-González, M.C.
Del Pozo, G.
Martín-Martín, D.
Muñoz-Díaz, L.
Pérez-Martínez, J.C.
Hernández-Balaguera, E.
Arredondo, B.
Galagan, Y.
Najafi, M.
Romero B.,
Publication year
2021
Abstract
Perovskite solar cells (PSCs) have become very popular due to the high efficiencies achieved. Nevertheless, one of the main challenges for their commercialization is to solve their instability issues. A thorough understanding of the processes taking place in the device is key for the development of this technology. Herein, J-V measurements have been performed to characterize PSCs with different active layer thicknesses. The solar cells’ parameters in pristine devices show no significant dependence on the active layer thickness. However, the evolution of the solar cells’ efficiency under ISOS-L1 protocol reveals a dramatic burn-in degradation, more pronounced for thicker devices. Samples were also characterized using impedance spectroscopy (IS) at different degradation stages, and data were fitted to a three RC/RCPE circuit. The low frequency capacitance in the thickest samples suffers a strong increase with time, which suggests a significant growth in the mobile ion population. This increase in the ion density partially screens the electric field, which yields a reduction in the extracted current and, consequently, the efficiency. This paper has been validated with two-dimensional numerical simulations that corroborate (i) the decrease in the internal electric field in dark conditions in 650 nm devices, and (ii) the consequent reduction in the carrier drift and, therefore, of the effective current extraction and efficiency.
Subject
Degradation
Impedance spectroscopy
J-V measurements
Numerical simulations
Perovskite solar cells
To reference this document use:
http://resolver.tudelft.nl/uuid:4c8659ee-f663-4936-916f-fbbd3baa0312
DOI
https://doi.org/10.3390/app112411668
TNO identifier
962263
Publisher
MDPI
ISSN
2076-3417
Source
Applied Sciences, 11 (11)
Document type
article