Publication date: 19th April 2024
There are several parameters to be considered when fabricating solar cells for space applications. Flexible space solar cells are usually packed before launching them into orbit where they unfold to harvest light. A flexible substrate widely used in space applications is Kapton, which that stands space radiation but is not suited for photovoltaics due to its low transparency. Additionally, thin-film lightweight flexible solar cells for space use expensive and fragile semiconductors [i.e. GaInP/GaAs/Ge (1.82/1.42/0.67 eV)]. Lately, investigation on perovskite solar cells for space applications is growing rapidly due to their radiation hardness and self-healing behaviour. In this work, we observed that it is possible to fabricate lightweight flexible perovskite solar cells with a mid-bandgap composition (FA0.7MA0.3PbI3 – 1.5 eV) via co-evaporation of the perovskite on polyether ether ketone (PEEK) substrates, which is very transparent in the UV-Vis range. Moreover, vacuum processing allows for more flexibility in the design of the device structure, so that bifacial and substrate (bottom metal – top illumination) configurations can be readily achieved. In this work, we observed that bifacial solar cells can withstand electron beam doses up to 1014 e-/cm2, although degradation is observed for higher doses of 1016 e-/cm2. Aiming to tackle such instability, we worked on substrate configuration cells using sublimed phosphonic acid containing molecules (MeO-2PACz) as hole transport layers, with promising thermal and illumination stability. Test under ionizing radiation being performed.
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