Journal
APL MATERIALS
Volume 8, Issue 4, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0005648
Keywords
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Funding
- National Natural Science Foundation of China [61604098]
- Shenzhen Science and Technology Innovation Commission [JCYJ20170412110137562, JCYJ20170302143001451]
- Key Project of Science and Technology of Guangdong Province [2020B010169003]
- Shenzhen University Scientific Research Start-up Foundation [860-000002110207]
- MOE tier 1 funding of NUS Faculty of Science, Singapore [R-144-000-402-114]
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Solar to fuel energy conversion is one of the momentous topics nowadays considering the urgent demand for clean energy supplies. In this work, the tunable electronic and optical properties of III-nitride/ZnO 2D/2D heterostructures (including GaN/ZnO, AlN/ZnO, and GaN/AlN) by strain engineering were investigated by first-principles calculations. The studied heterostructures feature a small interlayer distance, with the cation of one layer directly above the anion of the other layer, and vice versa. This leads to a strong binding energy and interlayer coupling across the heterostructure. The built-in field induced by the charge redistribution facilitates the photoexcited carrier migration, which is beneficial to the photocatalytic water splitting application. The stable III-nitride/ZnO heterostructures exhibit decent band edge positions with biaxial strain engineering and feature an enhancement of optical absorption under tensile strain. Our results indicate that the III-nitride/ZnO 2D/2D heterostructures are promising photocatalysts for solar to hydrogen generation by water splitting.
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