Optical and electrical properties of Au- and Ag-doped ReSe2

Yu Ci Jian, Der Yuh Lin, Jenq Shinn Wu, Ying Sheng Huang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Single crystals of Au- and Ag-doped ReSe2 (ReSe2:Au and ReSe2:Ag) have been grown by chemical vapor transport (CVT) method using iodine as a transporting agent. The optical properties are studied by absorption and polarized-thermoreflectance (PTR) spectroscopy at different polarization angles in the temperature range between 12 and 300 K. The direct band-edge excitonic transitions (Eex1, Eex 2, Eex3, and Eex s ) have been clearly revealed for the first time in the absorption spectra when the samples are made thin enough. The dominant Eex 1 and Eex 2 excitonic transitions gets strongest as the polarization is parallel and perpendicular to the b-axis, respectively. The parameters that describe the temperature dependence of the excitonic transition energy and the broadening function are extracted and discussed. We have also performed electrical conductivity and Hall measurements at different temperatures to derive the activation energy (∼95 and 50meV for ReSe 2:Au and ReSe2:Ag, respectively).

Original languageEnglish
Article number04CH06
JournalJapanese Journal of Applied Physics
Volume52
Issue number4 PART 2
DOIs
Publication statusPublished - 2013 Apr 1

Fingerprint

Electric properties
Optical properties
electrical properties
optical properties
Polarization
polarization
Iodine
Temperature
iodine
Absorption spectra
Activation energy
Vapors
Single crystals
Spectroscopy
vapors
activation energy
absorption spectra
temperature dependence
electrical resistivity
temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "Single crystals of Au- and Ag-doped ReSe2 (ReSe2:Au and ReSe2:Ag) have been grown by chemical vapor transport (CVT) method using iodine as a transporting agent. The optical properties are studied by absorption and polarized-thermoreflectance (PTR) spectroscopy at different polarization angles in the temperature range between 12 and 300 K. The direct band-edge excitonic transitions (Eex1, Eex 2, Eex3, and Eex s ) have been clearly revealed for the first time in the absorption spectra when the samples are made thin enough. The dominant Eex 1 and Eex 2 excitonic transitions gets strongest as the polarization is parallel and perpendicular to the b-axis, respectively. The parameters that describe the temperature dependence of the excitonic transition energy and the broadening function are extracted and discussed. We have also performed electrical conductivity and Hall measurements at different temperatures to derive the activation energy (∼95 and 50meV for ReSe 2:Au and ReSe2:Ag, respectively).",
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Optical and electrical properties of Au- and Ag-doped ReSe2. / Jian, Yu Ci; Lin, Der Yuh; Wu, Jenq Shinn; Huang, Ying Sheng.

In: Japanese Journal of Applied Physics, Vol. 52, No. 4 PART 2, 04CH06, 01.04.2013.

Research output: Contribution to journalArticle

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AU - Jian, Yu Ci

AU - Lin, Der Yuh

AU - Wu, Jenq Shinn

AU - Huang, Ying Sheng

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AB - Single crystals of Au- and Ag-doped ReSe2 (ReSe2:Au and ReSe2:Ag) have been grown by chemical vapor transport (CVT) method using iodine as a transporting agent. The optical properties are studied by absorption and polarized-thermoreflectance (PTR) spectroscopy at different polarization angles in the temperature range between 12 and 300 K. The direct band-edge excitonic transitions (Eex1, Eex 2, Eex3, and Eex s ) have been clearly revealed for the first time in the absorption spectra when the samples are made thin enough. The dominant Eex 1 and Eex 2 excitonic transitions gets strongest as the polarization is parallel and perpendicular to the b-axis, respectively. The parameters that describe the temperature dependence of the excitonic transition energy and the broadening function are extracted and discussed. We have also performed electrical conductivity and Hall measurements at different temperatures to derive the activation energy (∼95 and 50meV for ReSe 2:Au and ReSe2:Ag, respectively).

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