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Chin. Phys. B, 2011, Vol. 20(10): 107301    DOI: 10.1088/1674-1056/20/10/107301

Measuring thermoelectric property of nano-heterostructure

Lu Hong-Liang(路红亮), Zhang Chen-Dong(张晨栋), Cai Jin-Ming(蔡金明), Gao Min(高敏), Zou Qiang(邹强), Guo Hai-Ming(郭海明), and Gao Hong-Jun(高鸿钧)
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Abstract  A method of measuring the thermoelectric power of nano-heterostructures based on four-probe scanning tunneling microscopy is presented. The process is composed of the it in-situ fabrication of a tungsten-indium tip, the precise control of the tip-sample contact and the identification of thermoelectric potential. When the temperature of the substrate is elevated, while that of the tip is kept at room temperature, a thermoelectric potential occurs and can be detected by a current-voltage measurement. As an example of its application, the method is demonstrated to be effective to measure the thermoelectric power in several systems. A Seebeck coefficient of tens of μV/K is obtained in graphene epitaxially grown on Ru (0001) substrate and the thermoelectric potential polarity of this system is found to be the reverse of that of bare Ru (0001) substrate.
Keywords:  thermoelectric property      four-probe scanning tunneling microscope      graphene      nano-heterostructure  
Received:  06 May 2011      Revised:  20 May 2011      Accepted manuscript online: 
PACS:  73.50.Lw (Thermoelectric effects)  
  81.05.ue (Graphene)  
  68.37.Ef (Scanning tunneling microscopy (including chemistry induced with STM))  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60976089) and the National Basic Research Program of China (Grant Nos. 2007CB936802 and 2009CB929103).

Cite this article: 

Lu Hong-Liang(路红亮), Zhang Chen-Dong(张晨栋), Cai Jin-Ming(蔡金明), Gao Min(高敏), Zou Qiang(邹强), Guo Hai-Ming(郭海明), and Gao Hong-Jun(高鸿钧) Measuring thermoelectric property of nano-heterostructure 2011 Chin. Phys. B 20 107301

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