Abstract
Spatial photocurrent distribution in screen‐printed solar cells has been investigated using the light‐beam‐induced current (LBIC) technique. Furthermore, losses in short‐circuit current density have been analyzed through measurements of illuminated current‐voltage characteristics, spectral responses, and reflectance spectra. The LBIC measurements revealed that the p‐n junction area of the cell extended beyond the edge of a carbon (C) electrode on a film, but that the active area corresponded to the junction area covered with the C electrode. The photocurrent distribution in the active area was nonuniform. Its fluctuation increased with the film thickness, without being affected appreciably by voltage and white‐light biases. These results indicate that the fluctuation originated mainly from inhomogeneities of the film. From the optical analysis of the , the improvement in film quality proved essential for the increase in .
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