10-11-2021: Talk by Dr. F. Lang

Felix Lang

On November 10th, Felix Lang a Postdoc in the PotsdamPero group at the University of Potsdam (Germany) will present his talk on :
Perovskite-based Tandem Photovoltaics for Near-Earth, Moon, Mars and Deep Space Applications
From Radiation Tolerance to Open Challenges


Efficient perovskite-based multijunction solar cells with a high efficiency-to-mass ratio promise a next-generation of lightweight, flexible solutions to power private space exploration, low-cost space missions, as well as future habitats on the Moon and Mars.
This presentation will review the potential of perovskite-based multijunction solar cells – be it perovskite/silicon, perovskite/CIGS, or perovskite/perovskite – for space applications. I will show that current state-of-the-art systems already offer unparalleled power-to-weight ratios and then focus on radiation tolerance, a crucial prerequisite for any space application.
Monolithic perovskite/perovskite tandem PV especially exhibit an extraordinary resilience to the harsh radiation environment in space. I will present tests under 68 MeV proton irradiation that reveal negligible degradation (< 6%) at a dose of 1013 p+/cm2 where even III-V semiconductor-based space PV degrade >22%. Interestingly there are quite distinct degradation mechanisms between the two systems. High-spatial-resolution PL microscopy, for example, reveals defect clusters in GaAs being responsible for the degradation of current space-PV. On the contrary, there is negligible reduction in PL of the individual perovskite subcells. In fact, bare low-gap and high-gap perovskite absorbers exhibit identically high VOC, FF, and efficiency potentials after irradiation, rendering all-perovskite tandems highly interesting for thin, lightweight, large-area space PV modules & solar blankets.
Lastly, I will discuss open challenges regarding the many extremes in outer space, from UV-A, UV-B & VUV to extreme temperature cycles, Atomic-Oxygen, and LILT conditions.