Approach to Determine the Density-of-States Effective Mass with Carrier Concentration-Dependent Seebeck Coefficient
- Authors
- Lee, K.H.; Kim, S.-I.; Lim, J.-C.; Cho, J.Y.; Yang, H.; Kim, H.-S.
- Issue Date
- 15-Aug-2022
- Publisher
- John Wiley and Sons Inc
- Keywords
- carrier concentrations; density-of-states effective mass; Pisarenko plot; Seebeck coefficient; thermoelectric
- Citation
- Advanced Functional Materials, v.32, no.33
- Journal Title
- Advanced Functional Materials
- Volume
- 32
- Number
- 33
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/29496
- DOI
- 10.1002/adfm.202203852
- ISSN
- 1616-301X
- Abstract
- Band engineering is an effective strategy to improve the electronic transport properties of semiconductors. In thermoelectric materials research, density-of-states effective mass is an undoubted key factor in verifying the band engineering effect and establishing a strategy for enhancing thermoelectric performance. However, estimation of the effective mass is demanding or inaccurate depending on the methods taken. A simple equation is proposed, valid for all degeneracy: Log10 (md*T/300) = (2/3) Log10 (n) − (2/3) [20.3 − (0.00508 × |S|) + (1.58 × 0.967|S|)] that utilizes experimentally determined Seebeck coefficient (S) and carrier concentration (n) to determine the effective mass (md*) at a temperature (T). This straightforward equation, which gives an accurate analysis of the band modulation in terms of md*, is indispensable in designing thermoelectric materials of maximized performance. © 2022 Wiley-VCH GmbH.
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