Approach to Determine the Density-of-States Effective Mass with Carrier Concentration-Dependent Seebeck Coefficient

Kyu Hyoung Lee; Sang il Kim; Jong Chan Lim; Jung Young Cho; Heesun Yang; Hyun Sik Kim

doi:10.1002/adfm.202203852

Approach to Determine the Density-of-States Effective Mass with Carrier Concentration-Dependent Seebeck Coefficient

Kyu Hyoung Lee, Sang il Kim, Jong Chan Lim, Jung Young Cho, Heesun Yang, Hyun Sik Kim

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

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 (m_d*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 (m_d*) at a temperature (T). This straightforward equation, which gives an accurate analysis of the band modulation in terms of m_d*, is indispensable in designing thermoelectric materials of maximized performance.

Original language	English
Article number	2203852
Journal	Advanced Functional Materials
Volume	32
Issue number	33
DOIs	https://doi.org/10.1002/adfm.202203852
Publication status	Published - 2022 Aug 15

Bibliographical note

Funding 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).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1002/adfm.202203852

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title = "Approach to Determine the Density-of-States Effective Mass with Carrier Concentration-Dependent Seebeck Coefficient",

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.",

author = "Lee, {Kyu Hyoung} and Kim, {Sang il} and Lim, {Jong Chan} and Cho, {Jung Young} and Heesun Yang and Kim, {Hyun Sik}",

note = "Funding 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). Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",

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AU - Cho, Jung Young

AU - Yang, Heesun

AU - Kim, Hyun Sik

N1 - Funding 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). Publisher Copyright: © 2022 Wiley-VCH GmbH.

PY - 2022/8/15

Y1 - 2022/8/15

N2 - 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.

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Approach to Determine the Density-of-States Effective Mass with Carrier Concentration-Dependent Seebeck Coefficient

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