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Title: Suppression of Rotational Twins in Epitaxial B 12P 2 on 4H-SiC

B 12P2 was grown epitaxially on (0001) 4H-SiC using two different substrate miscuts: a standard 4° miscut toward the [$$11\bar{20}$$] and a custom miscut 4° toward the [$$1\bar{10}0$$]. Epitaxy on substrates miscut to the [$$11\bar{20}$$] resulted in highly twinned B 12P 2 films with a rotational twin density of approximately 70% twin orientation I and 30% twin orientation II. In contrast, epitaxy on substrates tilted toward the [$$1\bar{10}0$$] produced films of >99% twin orientation I. A H 2 etch model is used to explain the 4H-SiC surface morphology for each miscut prior to epitaxy and demonstrate how the surface steps influence the nucleation of B 12P 2 twin orientations. Surface steps on substrates miscut to the [$$11\bar{20}$$] tend to be zig-zagged with steps rotated 60° from one another producing B 12P 2 crystals that nucleate in orientations rotated by 60°, hence forming rotationally twinned films. In conclusion, steps on substrates tilted to the [$$1\bar{10}0$$] tend to be parallel resulting in crystallographically aligned B 12P 2 nucleation.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Center for Micro and Nano-Technologies; Kansas State Univ., Manhattan, KS (United States). Dept. of Chemical Engineering
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Center for Micro and Nano-Technologies
  3. Kansas State Univ., Manhattan, KS (United States). Dept. of Chemical Engineering
  4. Georgia Gwinnett College, Lawrenceville, GA (United States). School of Science and Technology
Publication Date:
Report Number(s):
LLNL-JRNL-731996
Journal ID: ISSN 1528-7483
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Crystal Growth and Design
Additional Journal Information:
Journal Volume: 18; Journal Issue: 2; Journal ID: ISSN 1528-7483
Publisher:
American Chemical Society
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 42 ENGINEERING
OSTI Identifier:
1424076