立方体AgMnSbTe3 熱電性能の高い半導体
Yubo Luo1, Tian Xu1, Zheng Ma1
1State Key Laboratory of Materials Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
Journal of the American Chemical Society
|August 19, 2021
まとめ
新しい半導体であるAgMnSbTe3はMnTeとAgSbTe2から合成された. この材料は,高いパワーファクターと1.46のピークZTを含む優れた熱電特性を持ち,エネルギーアプリケーションに有望です.
科学分野:
- 材料科学
- 固体化学
- 熱電機
背景:
- 熱電気材料は廃棄熱の回収と固体冷却に不可欠です.
- 高性能 (ZT) の新材料の開発は,効率的な熱電気装置にとって不可欠です.
研究 の 目的:
- AgSbTe2とMnTeを反応させることで,新しい半導体AgMnSbTe3を合成し,特徴づけること.
- AgMnSbTe3の構造的,電子的,熱電気的性質を調査する.
主な方法:
- MnTeとAgSbTe2の等分反応について
- 構造的特徴化のためのX線微分とペア分布関数解析.
- 光学バンドギャップ測定
- 密度関数理論 (DFT) の計算
- 熱電特性測定 (電力因数,熱伝導性,ZT)
主要な成果:
- AgMnSbTe3は統計的に分布したナCl構造に結晶する.
- この材料は, ~0.36 eVの狭い光学帯のギャップを持つp型半導体です.
- DFTの計算は熱電性能に有利な電子帯域構造を示した.
- 粒子の境界にあるAg2Teナノ粒子は,穴の伝達に軽微な影響を及ぼした.
- 823 K で ~12.2 μW cm−1 K−2 の高功率と ~0.34 W m−1 K−1 の超低格子熱伝導性を達成した.
- 823 KのピークZTは1.46で,400-823 Kの平均ZTは0.87でした.
結論:
- AgMnSbTe3は新しいp型熱電性材料です
- 独特の構造と電子特性により,熱電性能が高くなります.
- この材料は熱電気エネルギーの効率的な変換の可能性を示しています.
関連する概念動画
01:20Types of Semiconductors
1.0K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
1.0K
01:27Biasing of Metal-Semiconductor Junctions
382
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
382
01:27Schottky Barrier Diode
573
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
573