Studies on sulfur doping and figure of merit in vapor grown Sb2Te3 platelet crystals
- Title
- Studies on sulfur doping and figure of merit in vapor grown Sb2Te3 platelet crystals
- Creator
- Thankamma G.; Kunjomana A.G.
- Description
- A series of p-type Sb2Te3-xSx(x=0, 0.1, 0.2, 0.3 and 0.4) samples for each sulfur composition was vapor deposited to explore the crystal growth mechanism of platelet morphology and to understand their potential use for thermoelectric devices. Structural characterization performed by X-ray diffraction exhibited consistent rhombohedral unit cell parameters for all the antimony telluride crystals with D3d5 space group symmetry. Scanning electron microscopy (SEM) and energy dispersive analysis by X-rays (EDAX) were employed for morphological and compositional studies. The Seebeck coefficient S (?c) of Sb2Te3-xSx crystals for sulfur composition, x=0.3 was remarkably improved, yielding a figure of merit (ZT)=0.54, which is ?2.5 fold rise compared to the melt grown Sb2Te3 crystals. The atomic force microscopic (AFM) imprints revealed that, with increasing content of dopant, distribution of etch pits and microhardness increased in sulfur doped crystals. By optimizing sulfur doping, the antisite (AS) defect formation can be suppressed for enhancing ZT and the results obtained enable to design novel thermoelectric materials for application in power generation and refrigeration. 2015 Elsevier B.V. All rights reserved.
- Source
- Journal of Crystal Growth, Vol-415, pp. 65-71.
- Date
- 2015-01-01
- Publisher
- Elsevier
- Subject
- A1. Characterization; A1. Doping; A2. Growth from vapor; B2. Semiconducting materials
- Coverage
- Thankamma G., Crystal Research Centre, Department of Physics, Christ University, Bangalore, 560029, India; Kunjomana A.G., Crystal Research Centre, Department of Physics, Christ University, Bangalore, 560029, India
- Rights
- Restricted Access
- Relation
- ISSN: 220248; CODEN: JCRGA
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Thankamma G.; Kunjomana A.G., “Studies on sulfur doping and figure of merit in vapor grown Sb2Te3 platelet crystals,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 24, 2025, https://archives.christuniversity.in/items/show/17250.