Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.223
Publication date: 18th December 2023
Perovskite solar cells (PSC) are highly promising candidates for future space photovoltaics due to their high specific power potential. Yet, for successful application, devices need to resist several sets of extremes in space. In this presentation we will discuss their extraordinary radiation tolerance [1]–[3] and then move on to extreme temperatures and temperature cycles, two extremes that perovskites are well suited to. Atomic oxygen (AtOx), on the other hand, corrodes unencapsulated PSCs swiftly, as we identify. And while we find that this can be avoided using ultrathin evaporated 0.7 µm silicon oxide (SiOx) barriers, we set out to understand the AtOx-induced degradation mechanisms of phenethylammonium iodide (PEAI)-2D passivated and non-passivated devices. Surprisingly, degradation is more severe in 2D passivated PSCs. To disentangle damage mechanisms between 2D passivated and non-passivated devices we apply injection-current-dependent electroluminescence (EL) and intensity-dependent photoluminescence quantum yield (IPLQY) measurements. These allow us to derive pseudo-JV curves that are independent of parasitic resistance effect from damaged transport layers. We quantify an implied FF, that remains high after degradation suggesting that the perovskite bulk is not severely degraded. On the other hand, GIWAX studies reveal a degraded surface that limits charge extraction, and thus leads to lower performance metrics. This surface degradation is severely accelerated for 2D passivations and proceeds to areas that are covered by copper contacts due to lateral diffusion of AtOx though the 2D surface owing to the large interplanar distance of 2D perovskites.
[1] F. Lang et al., “Efficient minority carrier detrapping mediating the radiation hardness of triple-cation perovskite solar cells under proton irradiation,” Energy Environ. Sci., vol. 12, no. 5, pp. 1634–1647, 2019, doi: 10.1039/C9EE00077A.
[2] F. Lang et al., “Proton‐Radiation Tolerant All‐Perovskite Multijunction Solar Cells,” Adv. Energy Mater., vol. 11, no. 41, p. 2102246, Nov. 2021, doi: 10.1002/aenm.202102246.
[3] F. Lang et al., “Radiation Hardness and Self-Healing of Perovskite Solar Cells,” Adv. Mater., vol. 28, no. 39, pp. 8726–8731, Oct. 2016, doi: 10.1002/adma.201603326.
F.L. thanks the Volkswagen Foundation for Funding via the Freigeist Program
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