Singh, Komal and Anwar, Sharmistha and Dubey, Paritosh and Mishra, Suman K (2023) Enhanced thermoelectric performance of mechanically hard nano-crystalline-sputtered SnSe thin film compared to the bulk of SnSe. Journal of Materials Science-Materials in Electronics, 34 (13). Art No-1115. ISSN 0957-4522

PDF - Published Version Restricted to Registered users only Download (2706Kb) | Request a copy

Abstract

Thermoelectric thin-film architecture has the advantage over bulk by reducing further the thermal conductivity and increasing the figure of merit. The present work demonstrates the structural requirement to enhance the figure of merit and hardness of a SnSe thin film over bulk. The SnSe thin films were deposited over the glass substrate at different substrate temperatures (Ts) using the magnetron-sputtering technique. The bulk and the deposited films of SnSe were characterized by XRD, SEM, EDS, Raman spectroscopy, HRTEM, Nano-indentation, and thermoelectric properties (Seebeck coefficient, electrical, and thermal conductivities) measurement techniques. The structural, compositional, thermoelectrical, and mechanical analyses of films were used to establish the structure-property relationship for SnSe. The microstructure of the SnSe films was significantly affected by Ts. The well-evolved single-phase polycrystalline structure of the SnSe films was observed at high Ts (>= 400 degrees C). The planar orientations overlapping induced dislocations were observed at high Ts. The maximum ZT (0.83), power factor (similar to 2.43 mu Wcm(-1) K-2), and hardness (7.1 GPa) values were obtained for the SnSe film deposited at Ts = 500 degrees C. The structural modifications of SnSe thin film at high temperatures implemented by nano-crystallization, preferred orientation (111), grain boundaries, and competitive growth-induced dislocations were responsible for enhancing the figure of merit and hardness compared to bulk SnSe.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Director�s Secretariat
Depositing User:	Bidhan Chaudhuri
Date Deposited:	10 Oct 2023 07:22
Last Modified:	10 Oct 2023 07:22
URI:	http://cgcri.csircentral.net/id/eprint/5590

Actions (login required)

View Item