Singh, Palwinder and Kaur, Ramandeep and Sharma, Pankaj and Sharma, Vineet and Mishra, Monu and Gupta, Govind and Thakur, Anup (2017) Optical band gap tuning of Ag doped Ge2Sb2Te5 thin films. Journal of Materials Science: Materials in Electronics, 28. pp. 11300-11305. ISSN 0957-4522

PDF - Published Version Restricted to Registered users only Download (1400Kb) | Request a copy

Abstract

Thin films of (Ge2Sb2Te5)(100-x)Ag-x (x = 0, 1, 3, 5 and 10) were deposited using thermal evaporation technique. X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy was used to confirm the amorphous nature, uniformity and chemical compositions of deposited films respectively. Transmission spectra divulged the highly transparent nature of films in near infra red region. The average transmission in near infra red region and optical band gap (estimated by Tauc's plot) was increased with Ag doping upto x = 3 while it decreased for higher values of x. The increase in transmission and optical band gap was attributed to the reduction in density of localized states and vacancies. However, the decrease in the transmission and optical band gap is due to the increase in distortion of the host Ge2Sb2Te5 lattice because Ag is doped at the expense of Ge, Sb and Te. The increased optical band gap could be utilized to reduce threshold current which enhances switching speed in phase change materials.

Item Type:	Article
Additional Information:	copyright for this article belongs to M\S Springer Verlag.
Subjects:	Engineering > Electronics and Electrical Engineering Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	07 Dec 2018 07:33
Last Modified:	07 Dec 2018 07:33
URI:	http://npl.csircentral.net/id/eprint/2813

Actions (login required)

View Item