Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Ellipsometric and first-principles study on temperature-dependent UV–Vis dielectric functions of GaN

Not Accessible

Your library or personal account may give you access

Abstract

The third-generation wide bandgap semiconductor GaN currently occupies a hot spot in the fields of high-power electronics and optoelectronics. Fully exploring its optical and optoelectronic characteristics is of great significance. Here, we provide a systematic study on the temperature-dependent dielectric functions of GaN grown by metal-organic chemical vapor deposition in the spectral range of 0.73–5.90 eV via spectroscopic ellipsometry experiments and first-principles calculations. Ellipsometric measurements identify two typical absorption peaks that originate from the excitonic and phonon-assisted indirect absorption process, respectively. To explore the underlying physics, we perform first-principles calculations using the independent-particle approximation, model Bethe–Salpeter equation (mBSE), and phonon-assisted indirect absorption process (Inabs). In comparison with ellipsometric measurements, the mBSE calculation determines the absorption peak contributed by the many-body excitonic effect, while the Inabs calculation successfully predicts the second absorption peak. When heating the crystal, it observes the redshift and weakening of absorption peaks, intrinsically due to the nontrivial electron–phonon interaction as lattice vibration strengthens. While doping GaN with Fe or Si elements, the introduced free carriers modify the electronic interband transition. As the temperature increases, more free carriers are excited, and the temperature influence on the absorption peak is more significant than that of the undoped one. This work fully explores the physical origins of the temperature and doping effect on UV–Vis dielectric functions of GaN, aiming to promote its application in the fields of high-power electronic devices.

© 2021 Optical Society of America

Full Article  |  PDF Article
More Like This
Doping and temperature-dependent UV-Vis optical constants of cubic SrTiO3: a combined spectroscopic ellipsometry and first-principles study

Wenjie Zhang, Tianhao Fei, Tao Cheng, Chong Zheng, Yanbing Dong, Jia-Yue Yang, and Linhua Liu
Opt. Mater. Express 11(3) 895-904 (2021)

Temperature-dependent UV-Vis dielectric functions of BaTiO3 across ferroelectric-paraelectric phase transition

Shenglong Zhang, Tianhao Fei, Tao Cheng, Jia-Yue Yang, and Linhua Liu
Opt. Express 31(8) 12357-12366 (2023)

Dielectric function of vanadium oxide thin films by thermal annealing

Adolf Canillas, Frank Güell, Oriol Arteaga, Paulina R. Martínez-Alanis, Michel Vergnat, Hervé Rinnert, and Blas Garrido
Appl. Opt. 60(15) 4477-4484 (2021)

Supplementary Material (1)

NameDescription
Supplement 1       See Supplement 1 for supporting content.

Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved