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Giant Temperature Coefficient of Resistivity and Cryogenic Sensitivity in Silicon with Galvanically Displaced Gold Nanoparticles in Freeze-Out Region

Authors
Lee, Seung-HoonHwang, SeongpilJang, Jae-Won
Issue Date
2월-2017
Publisher
AMER CHEMICAL SOC
Keywords
galvanic displacement; temperature coefficient of resistivity; bolometer; cryogenic sensitivity; Au nanoparticles
Citation
ACS NANO, v.11, no.2, pp.1572 - 1580
Indexed
SCIE
SCOPUS
Journal Title
ACS NANO
Volume
11
Number
2
Start Page
1572
End Page
1580
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/84805
DOI
10.1021/acsnano.6b07007
ISSN
1936-0851
Abstract
The temperature coefficient of resistivity (TCR) and cryogenic sensitivity (Sr) of p-type silicon (p-Si) in the low-temperature region (10-30 K) are remarkably improved by increasing the coverage of galvanically displaced Au nanoparticles (NPs). By increase of the galvanic displacement time from 10 to 30 s, the average surface roughness (R-a) of the samples increases from 0.31 to 2.31 nm and the coverage rate of Au NPs increases from 3.1% to 21.9%. In the freeze-out region of the sample, an up to 103% increase of TCR and dramatically improved Sv of p-Si (similar to 5813%) are observed with Au coverage of 21.9% compared to p-Si without galvanically displaced Au NPs. By means of a finite element method (FEM) simulation study, it was found that the increase of surface roughness and a number of Au NPs on p-Si results in a higher temperature gradient and thermoelectric power to cause the unusual TCR and S-v values in the samples.
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