Probing Thermal Flux in Twinned Ge Nanowires through Raman Spectroscopy

被引:22
|
作者
Majumdar, Dipanwita [1 ]
Biswas, Subhajit [2 ,3 ,4 ]
Ghoshal, Tandra
Holmes, Justin D. [2 ,3 ,4 ,5 ]
Singha, Achintya [1 ]
机构
[1] Bose Inst, Dept Phys, 93-1 Acharya Prafulla Chandra Rd, Kolkata 700009, India
[2] Natl Univ Ireland Univ Coll Cork, Dept Chem, Mat Chem & Anal Grp, Cork, Ireland
[3] Natl Univ Ireland Univ Coll Cork, Tyndall Natl Inst, Cork, Ireland
[4] Natl Univ Ireland Univ Coll Cork, Mat Res Grp, Dept Chem, Cork, Ireland
[5] Univ Dublin Trinity Coll, AMBER CRANN, Dublin 2, Ireland
基金
爱尔兰科学基金会;
关键词
germanium nanowire; polytype phase; Raman spectroscopy; laser-induced heating; thermal properties; TEMPERATURE-DEPENDENCE; SILICON; CONDUCTIVITY; SCATTERING; PERFORMANCE; TRANSPORT; STRAIN; SI; HETEROSTRUCTURES; GROWTH;
D O I
10.1021/acsami.5b07025
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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 (chi(T)) 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.
引用
收藏
页码:24679 / 24685
页数:7
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