Abstract
The changes in morphology, composition and absorption spectra of thin evaporated CdTe films were studied during the treatment in air by a pulsed UV laser. The low-energy laser beam of 3.8 μJ cm −2 produces a photostimulated oxidation of CdTe perhaps to CdTeO 3, as revealed from the electron diffraction patterns. The high energy 1.07 mJ cm −2 beam causes a complete melting of the CdTe film and a formation of nearly quantum-confined CdTe particles 10 nm in size. The observed induced darkening of samples after the high-energy laser-beam action is described owing to the light absorption at the nanometer-sized CdTe particles.
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