Photo-Thermoelectric Effect at a Graphene Interface Junction

被引：534

作者：

Xu, Xiaodong ^{[1
]}

Gabor, Nathaniel M. ^{[1
,2
]}

Alden, Jonathan S. ^{[2
]}

van der Zande, Arend M. ^{[2
]}

McEuen, Paul L. ^{[1
,2
]}

机构：

[1] Cornell Univ, Ctr Nanoscale Syst, Ithaca, NY 14853 USA

[2] Cornell Univ, Atom & Solid State Phys Lab, Ithaca, NY 14853 USA

来源：

NANO LETTERS | 2010年 / 10卷 / 02期

关键词：

Graphene; photocurrent; photo-thermoelectric effect;

D O I：

10.1021/nl903451y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We investigate the optoelectronic response of a graphene single-bilayer interface junction using phococurrent (PC) microscopy. We measure the polarity and amplitude of the PC while varying the Fermi level by tuning a gate voltage. These measurements show that the generation of PC is by a photothermoelectric effect. The PC displays a factor of similar to 10 increase at the cryogenic temperature as compared to room temperature. Assuming the thermoelectric power has a linear dependence on the temperature, the inferred graphene thermal conductivity from temperature dependent measurements has a T-1,T-5 dependence below similar to 100 K, which agrees with recent theoretical predictions.

引用

页码：562 / 566

页数：5

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