Jiang, YanYang, Shih-ChiJeangros, QuentinPisoni, StefanoMoser, ThierryBuecheler, StephanTiwari, Ayodhya N.Fu, Fan2021-06-192021-06-192021-06-192020-05-2010.1016/j.joule.2020.03.017https://infoscience.epfl.ch/handle/20.500.14299/179027WOS:000535806100013y High specific power, high stowed packing efficiency, low processing cost, and high tolerance against environmental threats (high energy and charged particle radiation) make perovskite solar cell (PSC) a promising candidate for power generation in space. However, vacuum, as encountered in space, causes perovskite outgassing, raising concern for its long-term stability. In this work, we find that PSCs (ITO/SnO2/perovskite/Spiro-MeOTAD/Au) degrade ten times faster upon reducing the pressure from 9 x 10(4) to 5 x 10(3) Pa during operation, due to acceleration of the perovskite transformation and ion migration. Gas permeability of the layers atop perovskite and mobile ion-induced chemical reactions at charge transporting layers and related interfaces are two critical factors. We develop a PSC structure (ITO/PTAA/perovskite/PCBM/ZnO/AZO/[Ni/Al grid]) that effectively mitigates vacuum and illumination-induced degradation pathways, enabling PSCs to realize a low PCE loss rate of 0.007%/h over 1,037 h at the maximum power point under 100 mW cm(-2) illumination at 5 x 10(3) Pa.Chemistry, PhysicalEnergy & FuelsMaterials Science, MultidisciplinaryChemistryMaterials Scienceformamidiniumtolerancestabilitymigrationtemperatureinterfacesdesigngoldtext::journal::journal article::research article