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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51576

Title: Optical characterization of electronic structure of CuInS2 and CuAlS2 chalcopyrite crystals
Authors: Ching-Hwa Ho
Sheng-Feng Lo
Ping-Chen Chi
Ching-Cherng Wu
Ying-Sheng Huang
Kwong-Kau Tiong
Contributors: 國立臺灣海洋大學:電機工程學系
Keywords: CuAlS2
CuInS2
Solar-Energy Crystals
Thermoreflectance
Date: 2011-04
Issue Date: 2018-12-07T06:34:44Z
Publisher: Solid State Phenomena
Abstract: Abstract: Electronic structure of solar-energy related crystals of CuInS2 and CuAlS2 has been characterized using thermoreflectance (TR) measurement in the energy range between 1.25 and 6 eV. The TR measurements were carried out at room (~300 K, RT) and low (~30 K, LT) temperatures. A lot of interband transition features including band-edge excitons and higher-lying interband transitions were simultaneously detected in the low-temperature TR spectra of CuInS2 and CuAlS2. The energies of band-edge excitonic transitions at LT (RT) were analysed and determined to be =1.545 (1.535) and =1.554 eV (1.545 eV) for CuInS2, and =3.514 (3.486), =3.549 (3.522), and =3.666 eV (3.64 eV) for CuAlS2, respectively. The band-edge transitions of the and excitons are originated from the sulfur pp transitions in CuInS2 and CuAlS2 separated by crystal-field splitting. Several high-lying interband transitions were detected in the TR spectra of CuInS2 and CuAlS2 at LT and RT. Transition origins for the high-lying interband transitions are evaluated. The dependence of electronic band structure in between the CuInS2 and CuAlS2 is analysed and discussed.
Relation: 170 pp.21-24
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51576
Appears in Collections:[電機工程學系] 期刊論文

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