Optical properties of cubic boron arsenide
Abstract
The ultrahigh thermal conductivity of cubic boron arsenide (BAs) makes it a promising material for next-generation electronics and optoelectronics. Here, we report measured optical properties of BAs crystals, including the complex dielectric function, refractive index, and absorption coefficient in the ultraviolet, visible, and near-infrared wavelength range. The data were collected at room temperature using spectroscopic ellipsometry and transmission and reflection spectroscopy. We further calculated the optical response using density functional theory and many-body perturbation theory, considering quasiparticle and excitonic corrections. The computed values for the direct and indirect bandgaps (4.25 eV and 2.07 eV) agree well with the measured results (4.12 eV and 2.02 eV). Our findings pave the way for using BAs in future electronic and optoelectronic applications that take advantage of its demonstrated ultrahigh thermal conductivity and predicted high ambipolar carrier mobility.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 06, 2020
- Source ID
- 10.1063/5.0004666
Entities
People
- Bai Song
- Emmanouil Kioupakis
- Fei Tian
- Gang Chen
- Geethal Amila Gamage Udalamatta Gamage
- Ke Chen
- Kelsey Mengle
- Kyle Bushick
- Zhifeng Ren
Organizations
- Massachusetts Institute of Technology
- National Science Foundation
- Office of Naval Research
- Peking University
- United States Department of Energy
- University of Houston
- University of Michigan