A Modified Model Dielectric Function for Analyzing Optical Spectra of InGaN Nanofilms on Sapphire Substrates

Talwar, Devki N.; Lin, Hao-Hsiung; Haraldsen, Jason T.

doi:10.3390/nano15070485

A Modified Model Dielectric Function for Analyzing Optical Spectra of InGaN Nanofilms on Sapphire Substrates

Journal Article · Mon Mar 24 00:00:00 EDT 2025 · Nanomaterials

DOI:https://doi.org/10.3390/nano15070485· OSTI ID:2537949

; Lin, Hao-Hsiung;

Due to a lower InN bandgap energy Eg~0.7 eV, InxGa1−xN/Sapphire epifilms are considered valuable in the development of low-dimensional heterostructure-based photonic devices. Adjusting the composition x and thickness d in epitaxially grown films has offered many possibilities of light emission across a wide spectral range, from ultraviolet through visible into near-infrared regions. Optical properties have played important roles in making semiconductor materials useful in electro-optic applications. Despite the efforts to grow InxGa1−xN/Sapphire samples, no x- and d-dependent optical studies exist for ultrathin films. Many researchers have used computationally intensive methods to study the electronic band structures Ejk→, and subsequently derive optical properties. By including inter-band transitions at critical points from Ejk→, we have developed a semiempirical approach to comprehend the optical characteristics of InN, GaN and InxGa1−xN. Refractive indices of InxGa1−xN and sapphire substrate are meticulously integrated into a transfer matrix method to simulate d- and x-dependent reflectivity RE and transmission TE spectra of nanostructured InxGa1−xN/Sapphire epifilms. Analyses of RE and TE have offered accurate x-dependent shifts of energy gaps for InxGa1−xN (x = 0.5, 0.7) in excellent agreement with the experimental data.

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Sponsoring Organization:: USDOE

OSTI ID:: 2537949

Journal Information:: Nanomaterials, Journal Name: Nanomaterials Journal Issue: 7 Vol. 15; ISSN 2079-4991; ISSN NANOKO

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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