Ellipsometry Study of Interband Transitions in Tlgas<sub>2<i>x</I>< Mixed Crystals (0 ≤ <i>x</I> ≤ 1)

No Thumbnail Available

Date

2012

Authors

Isik, M.
Işık, Mehmet
Gasanly, N. M.

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

Open Access Color

OpenAIRE Downloads

OpenAIRE Views

Research Projects

Organizational Units

Organizational Unit
Department of Electrical & Electronics Engineering
Department of Electrical and Electronics Engineering (EE) offers solid graduate education and research program. Our Department is known for its student-centered and practice-oriented education. We are devoted to provide an exceptional educational experience to our students and prepare them for the highest personal and professional accomplishments. The advanced teaching and research laboratories are designed to educate the future workforce and meet the challenges of current technologies. The faculty's research activities are high voltage, electrical machinery, power systems, signal and image processing and photonics. Our students have exciting opportunities to participate in our department's research projects as well as in various activities sponsored by TUBİTAK, and other professional societies. European Remote Radio Laboratory project, which provides internet-access to our laboratories, has been accomplished under the leadership of our department with contributions from several European institutions.

Journal Issue

Abstract

In this paper, the spectroscopic ellipsometry measurements on TlGaS2xSe2(1 - x) mixed crystals (0 <= x <= 1) were carried out on the layer-plane (001) surfaces with light polarization E perpendicular to c* in the 1.2-6.2 eV spectral range at room temperature. The real and imaginary parts of the dielectric function, refractive index and extinction coefficient were calculated from ellipsometric data using the ambient-substrate optical model. The critical point energies in the above-band gap energy range have been obtained from the second derivative spectra of the dielectric function. Particularly for TlGaSe2 crystals, the determined critical point energies were assigned tentatively to interband transitions using the available electronic energy band structure. The effect of the isomorphic anion substitution (sulfur for selenium) on critical point energies in TlGaS2xSe2(1 - x) mixed crystals was established. (C) 2012 Elsevier B.V. All rights reserved.

Description

Gasanly, Nizami/0000-0002-3199-6686; Gasanly, Nizami/0000-0002-3199-6686; Isik, Mehmet/0000-0003-2119-8266

Keywords

Semiconductors, Optical constants, Ellipsometry

Turkish CoHE Thesis Center URL

Fields of Science

Citation

10

WoS Q

Q3

Scopus Q

Source

Volume

285

Issue

20

Start Page

4092

End Page

4096

Collections