期刊
APPLIED PHYSICS LETTERS
卷 109, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4971968
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资金
- NSF DMREF program [1534221, 1534303]
- J. Robert Beyster Computational Innovation Graduate Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1534303] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1534221] Funding Source: National Science Foundation
We present the theoretical and experimental results for the electronic and optical properties of atomically thin (1 and 2 monolayers) GaN quantum wells with AlN barriers. Strong quantum confinement increases the gap of GaN to as high as 5.44 eV and enables light emission in the deep-UV range. Luminescence occurs from the heavy and light hole bands of GaN yielding E perpendicular to c polarized light emission. Strong confinement also increases the exciton binding energy up to 230 meV, preventing a thermal dissociation of excitons at room temperature. However, we did not observe excitons experimentally due to high excited free-carrier concentrations. Monolayer-thick GaN wells also exhibit a large electron-hole wave function overlap and negligible Stark shift, which is expected to enhance the radiative recombination efficiency. Our results indicate that atomically thin GaN/AlN heterostructures are promising for efficient deep-UV optoelectronic devices. Published by AIP Publishing.
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