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Elevated thermoelectric figure of merit of n-type amorphous silicon by efficient electrical doping process
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. CSIR, CEERI, Pilani 333031, Rajasthan, India..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. (Mikrostrukturlaboratoriet)
Chalmers Univ Technol, Dept Microtechnol & Nanosci, Elect Mat Syst Lab, S-41296 Gothenburg, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. CSIR, CEERI, Pilani 333031, Rajasthan, India..ORCID iD: 0000-0002-7825-9501
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2018 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 44, p. 89-94Article in journal (Refereed) Published
Abstract [en]

The currently dominant thermoelectric (TE) materials used in low to medium temperature range contain Tellurium that is rare and mild-toxic. Silicon is earth abundant and environment friendly, but it is characterized by a poor TE efficiency with a low figure of merit, ZT. In this work, we report that ZT of amorphous silicon (a-Si) thin films can be enhanced by 7 orders of magnitude, reaching similar to 0.64 +/- 0.13 at room temperature, by means of arsenic ion implantation followed by low-temperature dopant activation. The dopant introduction employed represents a highly controllable doping technique used in standard silicon technology. It is found that the significant enhancement of ZT achieved is primarily due to a significant improvement of electrical conductivity by doping without crystallization so as to maintain the thermal conductivity and Seebeck coefficient at the level determined by the amorphous state of the silicon films. Our results open up a new route towards enabling a-Si as a prominent TE material for cost-efficient and environment-friendly TE applications at room temperature.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 44, p. 89-94
Keywords [en]
Thermoelectrics, Amorphous silicon, Electrical conductivity, Electrical doping, Energy harvesting
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-341565DOI: 10.1016/j.nanoen.2017.11.060ISI: 000419833900011OAI: oai:DiVA.org:uu-341565DiVA, id: diva2:1181939
Funder
Swedish Research Council, 621-2014-5596Swedish Foundation for Strategic Research , SE13-0061Available from: 2018-02-12 Created: 2018-02-12 Last updated: 2018-02-27Bibliographically approved

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Vallin, ÖrjanMajee, SubimalZhang, Shi-LiZhang, Zhi-Bin

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