Effect of laser annealing on the structural, electrical and optical properties of CdTe thin films

Abstract

CdTe films of 0.7 μm thickness were deposited by a resistive heating onto glass and KBr substrates kept at 200°C. The films were irradiated with laser pulses of various energy densities. A pulsed lase (Nd: YAG) capable of producing 20 ns pulses of wavelength 1.06 μm with varying energy densities (2–50 mJ/cm²) was employed. The films were examined by TEM and X-ray diffraction and found to be polycrystalline. DC conductivity and Hall coefficient measurements were made on the films in the temperature range 77–400 K. The optical energy gap has been calculated using the optical transmission spectra.