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Thermoelectric Nanowire Junction Photoresponse

Published online by Cambridge University Press:  19 May 2014

Tito E. Huber ,
Scott D. Johnson ,
Tina Brower ,
Quinton Barclift ,
Benjamin Panga  and
Gary Harris
Tito E. Huber
Affiliation:
Howard Nanoscale Science and Engineering Facility, Howard University, Washington DC 20059, USA
Scott D. Johnson
Affiliation:
Engineering, Prince George’s Community College, Largo MD 20774, USA.
Tina Brower
Affiliation:
Howard Nanoscale Science and Engineering Facility, Howard University, Washington DC 20059, USA
Quinton Barclift
Affiliation:
Engineering, Prince George’s Community College, Largo MD 20774, USA.
Benjamin Panga
Affiliation:
Engineering, Prince George’s Community College, Largo MD 20774, USA.
Gary Harris
Affiliation:
Howard Nanoscale Science and Engineering Facility, Howard University, Washington DC 20059, USA
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Abstract

Recently there have been reports of hot carrier thermoelectric response in nanostructured materials like graphene and MoS. We report observing that thermoelectric nanowire junctions detect light. In these experiments we employed devices composed of bismuth nanowire arrays which are capped with a transparent indium tin oxide electrode. The incident surface features very low optical reflectivity and enhanced light trapping. The unique attributes of the thermoelectric arrays are the combination of strong temporal and optical wavelength dependences of the photocurrent. Under infrared illumination, the signal can be completely described by “quasi-equilibrium” thermoelectric effects considering cooling rates given by heat diffusion through the array. The thermal diffusivity is found to be less (by a factor of 3.5) than in the bulk, a result that we discuss in terms of phonon confinement effects. In addition to a thermoelectric response, under visible illumination, we observe a photovoltaic response.

Keywords

thermoelectricitythermal conductivityBi
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1642: Symposium BB – Thermoelectric Materials—From Basic Science to Applications , 2014 , mrsf13-1642-bb11-28
Copyright
Copyright © Materials Research Society 2014 

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References

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