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.
|Journal||Advanced Functional Materials|
|Publication status||Published - 2022 Aug 15|
Bibliographical noteFunding Information:
K.H.L., S.‐i.K., and J.‐C.L. contributed equally to this work. This research was supported by Nano·Material Technology Development Program through National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2022M3H4A1A04076667).
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics