The importance of temperature dependent energy gap in the understanding of high temperature thermoelectric properties
Year: 2016
Type: article
Abstract: In this work, we show the importance of temperature dependent energy band gap, E g (T), in understanding the high temperature thermoelectric (TE) properties of material by considering LaCoO 3 (LCO) and ZnV 2 O 4 (ZVO) compounds as a case study. For the fix value of band gap, E g , deviation in the values of α has been observed above 360 K and 400 K for LCO and ZVO compounds, respectively. These deviation can be overcomed by consideration of temperature dependent band gap. The change in used value of E g with respect to temperature is ∼4 times larger than that of In As. This large temperature dependence variation in E g can be attributed to decrement in the effective on-site Coulomb interaction due to lattice expansion. At 600 K, the value of ZT for n and p-doped , LCO is ∼0.35 which suggest that it can be used as a potential material for TE device. This work clearly suggest that one should consider the temperature dependent band gap in predicting the high temperature TE properties of insulating materials.
Source: Materials Research Express
Authors: Saurabh Singh, Sudhir K Pandey
Institution: Indian Institute of Technology Mandi
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2492037446