Influence of Temperature‐Dependent Substrate Decomposition on Graphene for Separable GaN Growth. Issue 18 (26th July 2019)

• Record Type: Journal Article
• Authors: Park, Jeong‐Hwan; Lee, Jun‐Yeob; Park, Mun‐Do; Min, Jung‐Hong; Lee, Je‐Sung; Yang, Xu; Kang, Seokjin; Kim, Sang‐Jo; Jeong, Woo‐Lim; Amano, Hiroshi; Lee, Dong‐Seon
• Is Part Of: Advanced materials interfaces. Volume 6:Issue 18(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-07-26
• Subjects: gallium nitride -- graphene -- MOCVD -- substrate decomposition; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.201900821
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Graphene has been adopted in III−V material growth since it can reduce the threading dislocations and the III−V epilayer can easily be separated from the substrate due to the weak chemical bond. However, depending on the substrate supporting the graphene, some substrates decompose in the III−V material growth environment, which results in the problem that no graphene remains. In this study, the influence of temperature‐dependent substrate decomposition on graphene through an annealing process that resembles conventional growth conditions in metal–organic chemical vapor deposition (MOCVD) is investigated. It is also confirmed that trimethylgallium, hydrogen, and ammonia gases do not directly affect the graphene loss through gallium nitride (GaN) growth on a graphene/sapphire. In addition, GaN grown on graphene/sapphire could separate, but GaN grown on a graphene/GaN template could not be separated due to GaN template decomposition and related graphene damage. Through further investigation for graphene/gallium arsenide, it is deduced that the gallium generated by substrate decomposition does not play a major role in damage to the graphene but instead the nitrogen generated by substrate decomposition is closely related to it. These results suggest that it is very important to adopt a decomposition‐free substrate that do not damage graphene during GaN growth in MOCVD. Abstract : A systematic study of gallium nitride (GaN) template decomposition and related graphene damage during the GaN growth on a graphene/GaN template is summarized. Substrate decomposition is investigated by comparing the GaN template, sapphire, and gallium arsenide substrates having different decomposition temperatures. Methods for avoiding graphene damage are introduced in detail in this article.