薄膜热电器件具有高室温的优点数据
R Venkatasubramanian1, E Siivola, T Colpitts
1Research Triangle Institute, Research Triangle Park, North Carolina 27709, USA. rama@rti.org
Nature
|October 12, 2001
概括
研究人员开发了先进的薄膜热电材料,显著提高了在室温下高效的热和发电机的功率 (ZT) 的数字.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术 纳米技术
背景情况:
- 热电材料对于能量转换至关重要,其性能以优点数字 (ZT) 来衡量.
- 尽管进行了数十年的研究,但在室温下显著的ZT增强是有限的.
- 现有的散装材料,如Bi2Te3合金,表现中等.
研究的目的:
- 开发新的薄膜热电材料,在室温 (300 K) 中使用增强的ZT.
- 调查改善热电性能超越当前最先进的散装材料的方法.
- 探索这些材料在先进设备应用中的潜力.
主要方法:
- 制造Bi2Te3 / Sb2Te3超晶格薄膜. 制造Bi2Te3 / Sb2Te3超晶格薄膜.
- 在超级网格结构中对声子和电子运输进行控制的操纵.
- 热电性质的表征,包括ZT,在300 K.
主要成果:
- 在300K时实现了ZT的显著提升,与散装合金相比,p型Bi2Te3 / Sb2Te3超级网的最大系数约为2.4,与散装合金相比.
- 证明了快速局部冷却 (32 K) 和加热,具有高热流能力 (高达 700 W cm-2).
- 观察到的冷却和加热速度大约比散装设备快23000倍.
结论:
- 薄膜超级网格为克服散装热电材料的局限性提供了一个有希望的途径.
- 增强的ZT和快速热响应为下一代微尺度热管理和能源采集打开了道路.
- 潜在的应用包括芯片上的热化学,DNA微阵列和微电热系统.
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