An Assessment of Perovskite Solar Cells for Low-Intensity-Low-Temperature (LILT) Space Missions
Collin R. Brown1, Giles E. Eperon2,3, Vincent R. Whiteside1, Ian R. Sellers1
1Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, United States
/2Cavendish Laboratory, Cambridge, United Kingdom
/3Department of Chemistry, University of Washington, Seattle, WA, United States

Perovskite solar cells have the potential to be utilized in space solar arrays due to potential cost and weight savings, and the considerable radiation hardness demonstrated by these systems. Here, the potential of using high stability mixed cation perovskite solar cells for deep space high radiation missions is investigated. The suitability of these systems for space applications is evidenced by the absence of any structural phase transition between 4.2 K and 300 K, which demonstrates the excellent stability of these mixed cation perovskites. Temperature and intensity dependent current density-voltage (J-V) measurements are used to probe the solar cells under conditions consistent with the environments around the outer planetary systems of Mars, Jupiter, and Saturn. At low temperature, a barrier impeding current flow is observed in the structure and results in a largely decreased fill factor under 1-Sun AM0 conditions. However, under low intensity and low temperature (LILT) conditions, the fill factor and the power conversion efficiency are recovered. At low temperature, thermionic emission is the limiting factor for carrier extraction over the barrier and as such the small photocurrent generated at LILT conditions provide the conditions for efficient carrier extraction, even in situations where sample degradation may have occurred in transit.