High temperature MBE of graphene on sapphire and hexagonal boron nitride flakes on sapphire

Tin S. Cheng, Andrew Davies, Alex Summerfield, YongJin Cho, Izabela Cebula, Richard J. A. Hill, Christopher J. Mellor, Andrei N. Khlobystov, Takashi Taniguchi, Kenji Watanabe, Peter H. Beton, C. Thomas Foxon, Laurence Eaves, Sergei V. Novikov

Research output: Contribution to journalArticle

9 Citations (Scopus)
177 Downloads (Pure)

Abstract

The discovery of graphene and its remarkable electronic properties has provided scientists with a revolutionary material system for electronics and optoelectronics. Here, the authors investigate molecular beam epitaxy (MBE) as a growth method for graphene layers. The standard dual chamber GENxplor has been specially modified by Veeco to achieve growth temperatures of up to 1850°C in ultrahigh vacuum conditions and is capable of growth on substrates of up to 3 in. in diameter. To calibrate the growth temperatures, the authors have formed graphene on the Si-face of SiC by heating wafers to temperatures up to 1400°C and above. To demonstrate the scalability, the authors have formed graphene on SiC substrates with sizes ranging from 10 × 10 mm2 up to 3-in. in diameter. The authors have used a carbon sublimation source to grow graphene on sapphire at substrate temperatures between 1000 and 1650°C (thermocouple temperatures). The quality of the graphene layers is significantly improved by growing on hexagonal boron nitride (h-BN) substrates. The authors observed a significant difference in the sticking coefficient of carbon on the surfaces of sapphire and h-BN flakes. Our atomic force microscopy measurements reveal the formation of an extended hexagonal moiré pattern when our MBE layers of graphene on h-BN flakes are grown under optimum conditions. The authors attribute this moiré pattern to the commensurate growth of crystalline graphene on h-BN.

Original languageEnglish
Article number02L101
Number of pages6
JournalJournal of Vacuum Science and Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena
Volume34
Issue number2
Early online date11 Jan 2016
DOIs
Publication statusPublished - 1 Mar 2016

Keywords

  • graphene
  • sapphire
  • carbon
  • thin film growth

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