Contactless External Quantum Efficiency Evaluation of Perovskite Solar Cells

External quantum efficiency is an insightful parameter characterising solar cells, typically measured from the short circuit currents of the measured sample under excitation light of different wavelengths. A method to access this parameter in a contactless fashion would be highly relevant for optimising emerging solar cells throughout their fabrication, such as the bottom cell of a partially processed tandem device, for instance. This work reports on adapting and further developing an external quantum efficiency measurement method via contactless electroluminescence and evaluates its applicability to different solar cell technologies. After assessing the reliability of the technique on an industrial silicon solar cell, a proof-of-concept on a perovskite solar cell is presented. These initial results lay the groundwork for quick and effective analysis of the external quantum efficiency of fully and partially processed solar cells, without the need for electrical contact.