Type

Journal Article

Authors

Achintya Singha
Justin D Holmes
Tandra Ghoshal
Subhajit Biswas
Dipanwita Majumdar

Subjects

Chemistry

Topics
raman spectroscopy raman spectra nanowires transport properties laser excitation first order germanium nanowire laser induced heating thermal polytype phase comparative study thermal properties

Probing Thermal Flux in Twinned Ge Nanowires through Raman Spectroscopy. (2015)

Abstract We report a noninvasive optical technique based on micro-Raman spectroscopy to study the temperature-dependent phonon behavior of normal (nondefective) and twinned germanium nanowires (Ge-NWs). We studied thermophysical properties of Ge-NWs from Raman spectra, measured by varying excitation laser power at ambient condition. We derived the laser-induced temperature rise during Raman measurements by analyzing the Raman peak position for both the NWs, and for a comparative study we performed the same for bulk Ge. The frequency of the Ge-Ge phonon mode softens for all the samples with the increase in temperature, and the first-order temperature coefficient (χT) for defected NWs is found to be higher than normal NWs and bulk. We demonstrated that apart from the size, the lamellar twinning and polytype phase drastically affect the heat transport properties of NWs.
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Full list of authors on original publication

Achintya Singha, Justin D Holmes, Tandra Ghoshal, Subhajit Biswas, Dipanwita Majumdar

Experts in our system

1
Achintya Singha
University College Cork
Total Publications: 8
 
2
Justin D. Holmes
University College Cork
Total Publications: 287
 
3
Tandra Ghoshal
University College Cork
Total Publications: 32
 
4
Subhajit Biswas
University College Cork
Total Publications: 43
 
5
Dipanwita Majumdar
University College Cork
Total Publications: 4