Employing the increase in the number of laser pulses to improve the optical properties of SnTe nanoparticle thin films

Document Type : Research Paper


Department of Physics, Science collage, Mustansiryah University, Baghdad, Iraq


The pulsed laser deposition technique has been used to synthesize tin SnTe NPs thin films on substrate temperature about 300oC using a Nd-YAG laser with a wavelength of 1064 nm, a frequency of 5 Hz and a laser fluency of 16.56 J/cm2 at different laser pulses (200, 300, 400 and 500). The X-ray diffraction (XRD) patterns, UV-Visible spectrum, and photoluminescence (PL) measurements were used to investigate their structure and optical properties. The cubic structure of the tin telluride nanocrystal can be seen in the XRD pattern by increasing the number of laser pulses, and it is most evident at 500 pulse, which corresponds to a film thickness of 30 nm and a crystallite size of 12 nm. The UV-Visible spectrum shows the optical energy gap values of (3.2, 2.7, 2.6, and 2.29) eV decrease with increasing pulses for SnTe NPs at (200, 300, 400, and 500) pulses, respectively. The near band edge values are (1.8, 1.79, 1.75, and 1.75) eV decrease with increasing pulses of the (SnTe) NPs at (200, 300, 400, and 500) pulses, respectively.