Journal
ACS APPLIED NANO MATERIALS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.3c02811
Keywords
III-nitride; exfoliation; MOCVD; graphene; remote epitaxy
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Remote epitaxy via graphene has potential for epi-layer mechanical exfoliation, but the stability of graphene during epitaxy is crucial. N-2 carrier gas is found to be the better choice for protecting graphene during annealing experiments. The graphene transition layer can remain stable during low-temperature buffer growth, but recrystallization of buffer layers at higher temperatures destroys the graphene transition layer, preventing exfoliation of epi-layers.
Remoteepitaxy via graphene has acquired much attention becauseof its potential for epi-layer mechanical exfoliation. The stabilityof graphene during the epitaxy process is a key point in realizingepi-layer exfoliation. In this work, GaN and AlN buffer layers weregrown on a graphene-coated AlN/sapphire template and studied for thestability of graphene during the different stages of III-nitrides'remote epitaxy. The annealing experiments of graphene in differentatmospheres illustrate that N-2 carrier gas is the betterchoice to protect graphene. The graphene transition layer can remainstable during the low-temperature GaN or AlN buffer growth process,making the epi-layer exfoliable. However, when the temperature increasedto a common value for GaN growth in MOCVD, recrystallization of thebuffer layers happened and the graphene transition layer could bedestroyed. As a result, the epi-layers cannot be exfoliated in thiscase. These results illustrate that the recrystallization processshould be avoided or weakened to achieve exfoliation of the epi-layer.
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