SPLTRAK Abstract Submission
Planar and Nanowire InP Thin Solar Cells for Ultralight Space Power Applications
Sara Anjum, Pilar Espinet-Gonzalez, Harry A. Atwater
California Institute of Technology, Pasadena, CA, United States

Indium phosphide thin film solar cells have considerable potential for low-cost space photovoltaic applications due to their efficiency, ultralight weight form factor, favorable surface recombination properties, optimal bandgap, and innately high radiation resistnace compared to silicon and gallium arsenide. However, InP cells have received less attention than their GaAs and GaInP/GaAs counterparts for space photovoltaic application. However, future ultralight space photovoltaics with specific power > 1kW/kg will require innovative designs for flexible radiation-hard cells without conventional cover glass radiation shielding. We investigate here designs for ultralight InP space photovoltaics, including nanowire array cells, planar thin-film cells with TiO2/ITO optimized antireflection layers, and planar thin-film with pyramidally-textured TiO2 antireflection layers, and assess these designs with respect to efficiency, specific power, and scalable fabrication.