Abstract
The transport properties of photogenerated carriers in semi-insulating ($\ensuremath{\rho}={10}^{8}\ensuremath{-}{10}^{9}$ \ensuremath{\Omega} cm) polycrystalline films of CdTe are investigated. Measurements of the spectral variation of the optical-absorption coefficient and photomagnetoelectric short-circuit current are employed to obtain excess carrier diffusion lengths in films prepared at substrate temperatures of 150, 250, and 350 \ifmmode^\circ\else\textdegree\fi{}C. Analysis of the data also yields values for an effective Hall mobility, which, with stated approximations, allows an estimate of the diffusion-length lifetime ${\ensuremath{\tau}}_{0}$. Excess carrier diffusion lengths and diffusion-length lifetimes are found to be extremely small and in general agreement with earlier predictions concerning the magnitude of these parameters in relaxation semiconductors.
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