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Title: Phonon thermal transport in alloyed and hybrid zigzag nanoribbons of gold and silver
Authors: Kumar, Krishan
Singh, Gurvinder
Singh, Baljinder
Moudgil, R K
Keywords: Hybrid nanoribbons;Phonon transport
Issue Date: Mar-2020
Publisher: NISCAIR-CSIR, India
Abstract: We have investigated phonon transport in alloyed (Au0.5Ag0.5) and hybrid (AumAgn; here m and n are indices for the width of respective nanoribbons) zigzag nanoribbons of gold and silver. To this endeavour, we have employed the non-equilibrium Green’s function approach integrated with force-field methods as implemented in the General Utility Lattice Program. The phonon thermal conductance kph has been computed and its dependence on width of nanoribbons and temperature has been explored. It has been found that kph increases linearly with the width for the alloyed nanoribbons. However, the hybrid nanoribbons exhibit the linear behavior only for the special case of m=n. The calculated results of kph are compared with the corresponding pristine nanoribbons. Interestingly, we find that both alloying and hybridization result in a significant reduction in kph. For a comparable width, the reduction is more in the alloyed nanoribbons. Thus, our study suggests that alloying may be exploited to suppress the phononic thermal conductance, and hence to enhance the thermoelectric efficiency of nanoribbons.
Page(s): 53-55
ISSN: 2581-8198 (Online)
Appears in Collections:AIR Vol.02(1) [March 2020]

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