Epitaxy of Single-Crystalline GaN Film on CMOS-Compatible Si(100) Substrate Buffered by Graphene

Yuxia Feng, Xuelin Yang*, Zhihong Zhang, Duan Kang, Jie Zhang, Kaihui Liu, Xinzheng Li, Jianfei Shen, Fang Liu, Tao Wang, Panfeng Ji, Fujun Xu, Ning Tang, Tongjun Yu, Xinqiang Wang, Dapeng Yu, Weikun Ge, Bo Shen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

Abstract

Fabricating single-crystalline gallium nitride (GaN)-based devices on a Si(100) substrate, which is compatible with the mainstream complementary metal-oxide-semiconductor circuits, is a prerequisite for next-generation high-performance electronics and optoelectronics. However, the direct epitaxy of single-crystalline GaN on a Si(100) substrate remains challenging due to the asymmetric surface domains of Si(100), which can lead to polycrystalline GaN with a two-domain structure. Here, by utilizing single-crystalline graphene as a buffer layer, the epitaxy of a single-crystalline GaN film on a Si(100) substrate is demonstrated. The in situ treatment of graphene with NH3 can generate sp3 CN bonds, which then triggers the nucleation of nitrides. The one-atom-thick single-crystalline graphene provides an in-plane driving force to align all GaN domains to form a single crystal. The nucleation mechanisms and domain evolutions are further clarified by surface science exploration and first-principle calculations. This work lays the foundation for the integration of GaN-based devices into Si-based integrated circuits and also broadens the choice for the epitaxy of nitrides on unconventional amorphous or flexible substrates.

Original languageEnglish
Article number1905056
JournalAdvanced Functional Materials
Volume29
Issue number42
DOIs
Publication statusPublished - 1 Oct 2019
Externally publishedYes

Keywords

  • in-plane orientation
  • nucleation
  • Si(100)
  • single-crystalline GaN films
  • single-crystalline graphene

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