期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 41, 页码 46466-46475出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11883
关键词
hexagonal boron nitride; diamond; 2D; MOVPE; single-crystalline
资金
- MEXT Program for research and development of next-generation semiconductor to realize energy-saving society [JPJ005357]
- MOST-SKRDP [2016YFE0118400]
- NSFC [U1604263]
Hexagonal boron nitride (hBN) and diamond are promising materials for next-generation electronics and optoelectronics. However, their combination is rarely reported. In this study, we for the first time demonstrate the success to direct growth of two-dimensional (2D) hBN crystal layers on diamond substrates by metalorganic vapor phase epitaxy. Compared with the disordered growth we found on diamond (100), atomic force microscopy, X-ray diffraction, and transmission electron microscopy results all support 2D hBN with highly oriented lattice formation on diamond (111). Also, the epitaxial relationship between hBN and diamond (111) substrate is revealed to be [0 0 0 1](hBN) // [1 1 1](diamond) and [1 0 (1) over bar 0](hBN) // [1 1 (2) over bar](diamond) The valence band offset at hBN/diamond (111) heterointerface determined by X-ray photoelectron spectroscopy is 1.4 +/- 0.2 eV, thus yielding a conduction band offset of 1.0 +/- 0.2 eV and type II staggered band alignment with a bandgap of 5.9 eV assumed for hBN. Furthermore, prior thermal cleaning of diamond in a pure H-2 atmosphere smoothens the surface for well-ordered layered hBN epitaxy, while thermal cleaning in a mixed H-2 and NH3 atmosphere etches the diamond surface, creating many small faceted pits that destroy the following epitaxy of hBN.
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