Perovskites for space: Guidelines to performing relevant radiation-hardness experiments
Ahmad Kirmani a
a Center for Chemistry and Nanoscience, National Renewable Energy Laboratory, Golden, USA, Denver West Parkway, Golden, United States
Proceedings of New Generation Photovoltaics for Space (PVSPACE)
Online, Spain, 2022 June 21st - 22nd
Organizers: Narges Yaghoobi Nia, Aldo Di Carlo, Luigi Schirone and Mahmoud Zendehdel
Contributed talk, Ahmad Kirmani, presentation 008
Publication date: 8th June 2022

Perovskite solar cells are beginning to be explored as a space photovoltaic (PV) technology to power future missions into near-Earth and deep space orbits. This research field is, however, still in its infancy and requires a set of protocols that can allow proper assessment. In this talk, I will present guidelines to performing relevant radiation-tolerance experiments.[1] Putting recent reports into perspective, I will highlight three major pitfalls to avoid while testing radiation-tolerance of perovskite solar cells: cells with low initial power-conversion-efficiencies, use of suboptimal irradiation energies and fluences, and inadequate device architectures. Protons will be shown to be a radiation of choice for this assessment. The talk aims to drive home the point that perovskites are very different from the conventional III-V semiconductors – with significantly thinner absorber layers, and soft lattices – and protocols defined earlier for assessing III-V cells break down for perovskites. For perovskites, high-energy protons and electrons create local heating and can potentially self-heal the damaged lattices, masking the true extent of damage and making the tests less relevant. Low-energy protons (0.05- 0.15 MeV) will be suggested as the key to relevant testing and will be shown to create a uniform displacement damage profile within the device stack, mimicking the damage space radiation inflicts. I will close by presenting our recent strategies on improving radiation-hardness of perovskites.

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