Synthesis and Characterization of Se₃₅Te_65−xGe_x Nanoparticle Films and Their Optical Properties

Abstract

Thin films of () nanoparticles were synthesized using thermal evaporation method. They were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and absorption and transmission spectra. XRD results show that these films are of amorphous nature, while SEM images show nanoparticles with average particle size around 30 nm. No significant changes are observed in morphology of the deposited films by changing concentrations of Te and Ge. The optical behaviors of these films have been studied using the absorption and transmission spectra in the spectral region 400–1100 nm. The absorption, extinction coefficients and refractive index were obtained and investigated in more detail. The optical band gap () values were also determined and are found to decrease from 0.83 to 0.69 eV by increasing the concentration of Ge from 0 to 12. The transmission spectra for the thin films of nanoparticles show strong absorption at wavelength less than 500 nm and become highly transparent at wavelength above 800 nm. No significant changes in the transmission spectra are observed by increasing concentration of Ge. These results might be useful for development of optical disks and other semiconducting devices based on these nanochalcogenides.

Luminescence characteristics of C 5+ ions and 60 Co irradiated Li 2 BaP 2 O 7 :Dy 3+ phosphor

“…radiation dosimetry. Recently, in this context many well known materials have been investigated using C 6+ , Li 3+ and Ag 12+ ions and found to possess promising properties for dosimetry of heavy charged particles [15][16][17][18][19][20][21][22][23]. In the same context, the present work, describes the carbon and 60 Co induced thermoluminescence properties of Li 2 BaP 2 O 7 :Dy samples.…”

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“…The produced charge carriers are subsequently delivered to their appropriate electrodes via the solar cell's transporting layers. Finally, they are removed and used to generate current in an external circuit [26][27][28][29][30][31][32] .…”

A DFT study of SenTenclusters

“…Nano structured films obtained by assembling atomic clusters are of strategic importance for a wide variety of applications [1,2]. Recently, nano-structured thin films are prepared and studied for their structural, optical and electrical properties [19][20][21][22][23]. Formation of small clusters has been noticed [23] in Se − T e thin films.…”