Characterizing UV degradation in perovskites for space applications
Bas de Jong a, Lucio Cinà b, Annalisa Santucci a
a Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via A. Moro 2, 53100, Siena, Italy
b Cicci Research srl, via Giordania 227, 58100, Grosseto, Italy
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, Bas de Jong, presentation 009
Publication date: 8th June 2022

Perovskite devices are known to degrade when exposed to far UV radiation [1][2]. The spectrum of sunlight in space, AM0, contains more UV radiation than the typical AM1.5 spectrum used in the industry to characterize photovoltaic devices. Often, Xenon-based light sources are used to mimic the AM1.5 spectrum. Considering the low amount of UV radiation, LED based illumination has the potential to better mimic the AM0 spectrum. Multiple LEDs with different illumination peaks are used in conjunction and controlled independently. To estimate the match of the LED spectrum with AM0, the LEDs are placed behind a monochromator and an EQE is performed on a perovskite. From this EQE, the mismatch factor is obtained. This factor is used to correct the JV curve obtained with the same illumination. 

LED based light sources also allow for pure ultraviolet light to investigate the degradation effects of perovskites due to UV light. A sealed chamber allowing for an inert atmosphere was developed for stability measurements. Localized peltier elements and small area near-proximity high-power LEDs allow for very fast cycling in both temperature and irradiance, respectively. Additionally, in operando PL-EL can be performed during stability measurements to extract radiative recombination and, hence, the status of the active layer.

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