Article

Exciton quantum confinement in nanocones formed on a surface of CdZnTe solid solution by laser radiation.

Nanoscale Research Letters (Impact Factor: 2.48). 09/2012; 7(1):514. DOI: 10.1186/1556-276X-7-514
Source: PubMed

ABSTRACT The investigation of surface morphology using atomic force microscope has shown self-organizing of the nanocones on the surface of CdZnTe crystal after irradiation by strongly absorbed Nd:YAG laser irradiation at an intensity of 12.0 MW/cm2. The formation of nanocones is explained by the presence of a thermogradient effect in the semiconductor. The appearance of a new exciton band has been observed after irradiation by the laser which is explained by the exciton quantum confinement effect in nanocones.

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    ABSTRACT: The resistivity of CdZnTe crystals significantly increases after irradiation with λ=1064 nm Nd:YAG laser. This effect is explained by the compensation of Cd vacancies with In interstitial atoms caused by the increased In solubility due to a laser-induced temperature gradient field around the Te inclusions in the bulk of the crystal. The temperature gradient is caused by the selective absorption of the laser radiation by the Te inclusions. Evidence supporting our explanation is both the increase of the optical transparency of the crystal in IR spectra as well as the decrease of A°X band and the increase of D°X band intensity in photoluminescence spectra after irradiation by the laser.
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