Multijunction solar cells with pronounced optical coupling: Single wavelength laser biasing approach at quantum efficiency measurements

Abstract

In this work, a new approach to find absolute values of the external quantum efficiency of multijunction solar cells with strong optical coupling between individual subcells is proposed. A distinctive feature of the approach is a single wavelength light biasing – blue laser – for providing required conditions for recording the narrowband subcell spectral characteristics. To find the true photoresponse values (without the negative influence of the optical coupling) a two-dimensional current plane describing photocurrents of subcells and their impact on each other is performed.