Bias-Dependent Stability of Perovskite Solar Cells: Degradation Mechanisms Reconsidered
Iris Visoly-Fisher a d, Mark V. Khenkin a, K.M. Anoop a, Yulia Galagan b, Stav Rahmany c, Lioz Etgar c, Eugene A. Katz a d
a Dept. of Solar Energy and Environmental Physics, Swiss Inst. for Dryland Environmental and Energy Research, J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion, Israel, Midreshet Ben-Gurion, Israel
b Holst Centre – Solliance, High Tech Campus, Eindhoven, the Netherlands
c The Hebrew University of Jerusalem, The Institute of Chemistry, Casali Center of Applied Chemistry, Edmond J. Safra Campus Givat Ram, Jerusalem, Israel
d Ilse Katz Institute for Nanoscale Science & Technology, Ben Gurion University of the Negev
nanoGe Perovskite Conferences
Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
International Conference on Perovskite Thin Film Photovoltaics
Jerusalem, Israel, 2019 February 24th - 27th
Organizers: Lioz Etgar and Kai Zhu
Oral, Iris Visoly-Fisher, presentation 002
DOI: https://doi.org/10.29363/nanoge.nipho.2019.002
Publication date: 21st November 2018

Sunlight concentration allows accelerated stability studies and separating the effect of light on material and cell stability from other factors. Our experimental methodology allows independent control of sunlight intensity, the sample temperature and environment during the exposure. Stress testing of perovskite solar cells (PSCs) showed that faster degradation was found for cells held at short circuit (SC) under concentrated sunlight and on the initial stage of outdoor exposure. However, cells kept at SC showed better long-term stability compared to cells kept at open circuit (OC) upon real operational conditions. We also found that (sun)light intensity was more important than illumination dose for cells degradation at SC conditions, while dose was the determining factor at OC. This indicates that different degradation mechanisms are dominant at different degradation stages and under different bias conditions, and that nano-scale understanding of degradation mechanisms is required to suggest ways to increase the device life-time.[1] Such bias-dependent degradation has been previously observed also in other types of solar cell technologies. Yet, the stability of these solar cells was greatly improved by rationale design. Bias-dependent atomic-scale degradation mechanisms in different photovoltaic technologies are compared to those of PSCs, towards identifying lessons that can be learned to improve PSC stability.[2]

 

[1] Manuscript in preparation

[2] Mark V. Khenkin, Anoop K.M., Eugene A. Katz, Iris Visoly-Fisher, Bias-Dependent Degradation of Various Solar Cells: Lessons for Stability of Perovskite Photovoltaics, Submitted

 

[1] Manuscript in preparation

[2] Mark V. Khenkin, Anoop K.M., Eugene A. Katz, Iris Visoly-Fisher, Bias-Dependent Degradation of Various Solar Cells: Lessons for Stability of Perovskite Photovoltaics, Submitted

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