Perovskite CH3NH3PbI3–XClx Solar Cells. Experimental Study of Initial Degradation Kinetics and Fill Factor Spectral Dependence
| Autor: | I. Kaulachs, Modris Roze, A. Flerov, Andrei Tokmakov, A. Holsts, Igors Mihailovs, Martins Rutkis, Anastasija Ivanova |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Degradation kinetics
Solid-state physics QC1-999 General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences 7. Clean energy NATURAL SCIENCES:Physics [Research Subject Categories] media_common.cataloged_instance European union fill factor spectral dependence Perovskite (structure) media_common Physics Horizon (archaeology) Energy conversion efficiency General Engineering 021001 nanoscience & nanotechnology Engineering physics 0104 chemical sciences power conversion efficiency degradation kinetics lead halide perovskite solar cells Fill factor 0210 nano-technology |
| Zdroj: | Latvian Journal of Physics and Technical Sciences, Vol 58, Iss 1, Pp 53-69 (2021) Latvian Journal of Physics and Technical Sciences |
| Popis: | The main drawback of the methylammonium lead halide perovskite solar cells is their degradation in ambient atmosphere. To investigate ambient-air-induced cell degradation, spec-tral dependencies of open-circuit voltage (VOC), fill factor (FF) and the power conversion effi-ciency (PCE) have been acquired (for the first time reported in literature). Our custom-made measurement system allowed us to perform measurements of the above-mentioned entities in situ directly in vacuum during and after thermal deposition of the elec-trode. We also studied how these parameters in vacuum changed after cell exposure to ambient air for 85 min (50 nm top electrode) and for 180 min (100 nm top Ag electrode). For fresh CH3NH3PbI3–xClx cell (never been in open air) with very high shunt resistance of 3·107 Ω·cm2 (with practically no shorts and therefore FF could be determined mainly by charge carrier recombination processes) we found that FF in vacuum increased along with an increase of the incident photon energy from 0.55 at 760 nm up to 0.82 at 400 nm. Hypothesis considering hot polaron participation in charge carrier photogeneration and recombination processes as well as another competing hypothesis were offered as possible explanations for the observed FF increase. The kinetics of short-circuit photocurrent EQE with a change in pressure was also inves-tigated. It was also shown that perovskite solar cell degradation could be noticeably reduced by increasing the top Ag electrode thickness to at least 100 nm, which could possibly facilitate the usual encapsulation process.---//---This work is licensed under a CC BY 4.0 license. Institute of Solid State Physics, University of Latvia as the Centre of Excellence has received funding from the European Union’s Horizon 2020 Framework Pro-gramme H2020-WIDESPREAD-01-2016-2017-Teaming Phase2 under grant agreement No. 739508, project CAMART² |
| Databáze: | OpenAIRE |
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