TY - JOUR
T1 - Lattice-matched III-nitride structures comprising BAlN, BGaN, and AlGaN for ultraviolet applications
AU - AlQatari, Feras S.
AU - Sajjad, Muhammad
AU - Lin, Ronghui
AU - Li, Kuanghui
AU - Schwingenschlögl, Udo
AU - Li, Xiaohang
N1 - KAUST Repository Item: Exported on 2021-11-24
Acknowledged KAUST grant number(s): BAS/1/1664-01-01, REP/1/3189-01-01, URF/1/3437-01-01, URF/1/3771-01-01
Acknowledgements: The authors acknowledge support of KAUST Baseline Fund BAS/1/1664-01-01, Competitive Research Grants URF/1/3437-01-01 and
URF/1/3771-01-01, and GCC Research Council REP/1/3189-01-01.
PY - 2021/8/18
Y1 - 2021/8/18
N2 - The optical properties of BAlN, BGaN and AlGaN ternary alloys are investigated using hybrid density functional for the design of lattice-matched optical structures in the ultraviolet spectrum. The calculated AlGaN properties agree well with previous reports, validating the model. A peculiar non-monotonic behavior of the refractive index as a function of the boron composition is found. The results of this calculation are interpolated to generate a three-dimensional dataset, which can be employed for designing a countless number of lattice-matched and –mismatched heterostructures. These heterostructures could span a range of operating wavelength well into the deep ultraviolet with refractive indices ranging from 1.98 to 2.41 for AlN at 0 eV and GaN near the GaN bandgap, respectively. An example is shown where a lattice-matched heterostructure, AlN/B0.108Ga0.892N, is applied for DBR applications with a large index difference. A DBR comprising the AlN/B0.108Ga0.892N heterostructure at the UV wavelength of 375 nm is found to exceed 93% peak reflectivity with only 10 pairs and reaches 100% reflectivity with 35 pairs. For a chosen design with 25 pairs, the DBR has a peak reflectivity of 99.8% and a bandwidth of 26 nm fulfilling the requirements of most devices especially ultraviolet vertical-cavity surface emitting lasers.
AB - The optical properties of BAlN, BGaN and AlGaN ternary alloys are investigated using hybrid density functional for the design of lattice-matched optical structures in the ultraviolet spectrum. The calculated AlGaN properties agree well with previous reports, validating the model. A peculiar non-monotonic behavior of the refractive index as a function of the boron composition is found. The results of this calculation are interpolated to generate a three-dimensional dataset, which can be employed for designing a countless number of lattice-matched and –mismatched heterostructures. These heterostructures could span a range of operating wavelength well into the deep ultraviolet with refractive indices ranging from 1.98 to 2.41 for AlN at 0 eV and GaN near the GaN bandgap, respectively. An example is shown where a lattice-matched heterostructure, AlN/B0.108Ga0.892N, is applied for DBR applications with a large index difference. A DBR comprising the AlN/B0.108Ga0.892N heterostructure at the UV wavelength of 375 nm is found to exceed 93% peak reflectivity with only 10 pairs and reaches 100% reflectivity with 35 pairs. For a chosen design with 25 pairs, the DBR has a peak reflectivity of 99.8% and a bandwidth of 26 nm fulfilling the requirements of most devices especially ultraviolet vertical-cavity surface emitting lasers.
UR - http://hdl.handle.net/10754/670624
UR - https://iopscience.iop.org/article/10.1088/2053-1591/ac1caa
UR - http://www.scopus.com/inward/record.url?scp=85114016326&partnerID=8YFLogxK
U2 - 10.1088/2053-1591/ac1caa
DO - 10.1088/2053-1591/ac1caa
M3 - Article
SN - 2053-1591
VL - 8
SP - 086202
JO - Materials Research Express
JF - Materials Research Express
IS - 8
ER -