It is demonstrated that the measured diffuse reflectance spectra of γ-In2Se3 can be used to map the conduction band edge density of states through Kubelka-Munk analysis. The Kubelka-Munk function derived from the measured spectra almost mimics the calculated density of states in the vicinity of conduction band edge. The calculation of density of states was carried out using first-principles approach yielding the structural, electronic, and optical properties. The calculations were carried out implementing various functionals and only modified Tran and Blaha (TB-MBJ) results tally closest with the experimental result of band gap. The electronic and optical properties were calculated using FP-LAPW + lo approach based on the Density Functional Theory formalism implementing only TB-mBJ functional. The electron and hole effective masses have been calculated as and , respectively. The optical properties clearly indicate the anisotropic nature of γ-In2Se3.
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28 March 2018
Research Article|
March 29 2018
Mapping the conduction band edge density of states of γ-In2Se3 by diffuse reflectance spectra
Pradeep Kumar;
Pradeep Kumar
1
Thin Film Laboratory, Department of Physics and Astrophysics, University of Delhi
, Delhi 110007, India
2
Department of Physics and Electronics, Hans Raj College, University of Delhi
, Delhi 110007, India
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Agnikumar G. Vedeshwar
Agnikumar G. Vedeshwar
a)
1
Thin Film Laboratory, Department of Physics and Astrophysics, University of Delhi
, Delhi 110007, India
a)Author to whom correspondence should be addressed: agni@physics.du.ac.in and agvedeshwar@gmail.com
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a)Author to whom correspondence should be addressed: agni@physics.du.ac.in and agvedeshwar@gmail.com
J. Appl. Phys. 123, 125107 (2018)
Article history
Received:
December 17 2017
Accepted:
March 15 2018
Citation
Pradeep Kumar, Agnikumar G. Vedeshwar; Mapping the conduction band edge density of states of γ-In2Se3 by diffuse reflectance spectra. J. Appl. Phys. 28 March 2018; 123 (12): 125107. https://doi.org/10.1063/1.5019809
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