Ambipolar diffusion length in cugase2 thin films for solar cell applications measuredby steady-state photocarrier grating technique

Abstract

The steady-state photocarrier grating technique is used to measure the transport properties of polycrystalline CuGaSe2 thin films. The influence of composition and growth temperature is analysed in bilayers grown exactly the same way asabsorbers for solar cells. The photocurrent losses in solar cells in ‘substrate’ and ‘superstrate’ configuration are relatedto the measured diffusion lengths. © 1993 The Japan Society of Applied Physics.