Initiation and evolution of phase separation in heteroepitaxial InAlAs films

Cited 28 time in webofscience Cited 28 time in scopus
  • Hit : 133
  • Download : 0
We have investigated the initiation and evolution of phase separation in heteroepitaxial InAlAs films. In misfit-free InAlAs layers, cross-sectional scanning tunneling microscopy (XSTM) reveals the presence of isotropic nanometer-sized clusters. For lattice-mismatched InAlAs layers with 1.2% misfit, quasiperiodic contrast modulations perpendicular to the growth direction are apparent. Interestingly, these lateral modulations are apparently initiated within the first few bilayers of film growth, and both the amplitude and wavelength of the modulations increase with film thickness. The saturation value of the modulation wavelength determined from XSTM coincides with the lateral superlattice period determined from (002) x-ray reciprocal space maps, suggesting that the lateral modulation wavelength represents a periodic composition variation. Together, these results suggest that phase separation in the heteroepitaxial InAlAs thin-film system is a misfit-driven kinetic process initiated by random compositional nonuniformities, which later develop into coupled compositional and surface morphological variations. (C) 2002 American Institute of Physics.
Publisher
AMER INST PHYSICS
Issue Date
2002-05
Language
English
Article Type
Article
Keywords

MOLECULAR-BEAM EPITAXY; SPINODAL DECOMPOSITION; LOW-TEMPERATURE; SUPERLATTICES; MODULATION; INP(001)

Citation

APPLIED PHYSICS LETTERS, v.80, no.18, pp.3292 - 3294

ISSN
0003-6951
DOI
10.1063/1.1476386
URI
http://hdl.handle.net/10203/201858
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 28 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0