期刊
ANALYTICAL CHEMISTRY
卷 94, 期 3, 页码 1510-1514出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.1c03624
关键词
-
资金
- Science and Engineering Research Board, Govt. of India [CRG/2019/000371]
- IIT Indore
- DST, Government of India [DST/INSPIRE/03/2018/000910/IF180398, DST/INSPIRE/03/2019/002160/IF190314]
- UGC, Government of India [1304-JUNE-2018-513215]
- Department of Science and Technology (DST), Government of India, under the FIST scheme [SR/FST/PSI-225/2016]
This study demonstrates the use of temperature dependent Raman spectromicroscopy to determine the position and temperature associated Fermi shift in an extrinsic semiconductor, silicon. The Raman line-shape parameters, quantifying the Fano-coupling, are used to reveal the value of the Fermi energy and its thermal shift.
The Fermi energy is known to be dependent on doping and temperature, but finding its value and corresponding thermal Fermi shift experimentally is not only difficult but is virtually impossible if one attempts their simultaneous determination. We report that temperature dependent Raman spectromicroscopy solves the purpose easily and proves to be a powerful technique to determine the position and temperature associated Fermi shift in an extrinsic semiconductor as demonstrated for silicon in the present study. The typical asymmetrically broadened Raman spectral line-shape from sufficiently doped n- and p-type silicon contains the information about the Fermi level position through its known association with the Fano-coupling strength. Thus, Raman line-shape parameters, the terms quantify the Fano-coupling, have been used as experimental observables to reveal the value of the Fermi energy and consequent thermal Fermi shift. A simple formula has been developed based on existing established theoretical frameworks that can be used to calculate the position of the Fermi level. The proposed Raman spectroscopy-based formulation applies well for n- and p-type silicon. The calculated Fermi level position and its temperature dependent variation are consistent with the existing reports.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据