Scanning photoemission microscopy (SPEM) has been used to investigate the effect of morphological defects in GaN films grown on a 6H–SiC substrate on the composition and electronic properties of Ni/GaN interfaces in the temperature range of 25–600 °C. The SPEM imaging and spectroscopy identified a direct relation between the defects and the development of spatial heterogeneity in the interfacial composition, best pronounced after moderate annealing at 300 °C. The Schottky barrier height measured at these heterogeneous interfaces changes with advancement of the Ni–GaN reaction at elevated temperatures but exhibits negligible spatial variations.

1.
Q. Z.
Liu
and
S. S.
Lau
,
Solid-State Electron.
42
,
677
(
1998
).
2.
S. C.
Jain
,
M.
Willinder
,
J.
Narayan
, and
R.
van Overstraeten
,
J. Appl. Phys.
67
,
965
(
2000
).
3.
M.
Marsi
,
L.
Casalis
,
L.
Gregoratti
,
S.
Günther
,
A.
Kolmakov
,
J.
Kovac
,
D.
Lonza
, and
M.
Kiskinova
,
J. Electron Spectrosc. Relat. Phenom.
84
,
73
(
1997
).
4.
L.
Gregoratti
,
M.
Marsi
, and
M.
Kiskinova
,
Synchrotron Radiat. News
12
,
40
(
1999
).
5.
C. I.
Wu
and
A.
Kahn
,
J. Vac. Sci. Technol. B
16
,
2218
(
1998
).
6.
V. M.
Bermudez
,
D. D.
Kolesce
, and
A. E.
Wickenden
,
Appl. Surf. Sci.
126
,
69
(
1998
).
7.
A.
Barinov
,
L.
Gregoratti
,
L.
Casalis
, and
M.
Kiskinova
,
Phys. Rev. B
63
,
085308
(
2001
).
8.
M.
Marsi
,
J. Electron Spectrosc. Relat. Phenom.
94
,
149
(
1998
).
9.
V. M.
Bermudez
,
R.
Kaplan
,
M. Asif.
Khan
, and
J. N.
Kuznia
,
Phys. Rev. B
48
,
2436
(
1993
).
10.
W. R. L
Lambrecht
,
B.
Degal
,
S.
Strite
,
G.
Martin
,
A.
Agarwal
,
H.
Morkoc
, and
A.
Rockett
,
Phys. Rev. B
50
,
14155
(
1994
).
11.
Q.-z.
Xue
,
Q. K.
Xue
,
R. Z.
Bakhtizin
,
Y.
Hasegawa
,
I. S. T.
Tsong
,
T.
Sakurai
, and
T.
Ohno
,
Phys. Rev. B
59
,
12604
(
1999
).
12.
A. R.
Smith
,
R. M.
Feenstra
,
D. W.
Greve
,
M. S.
Shin
,
J.
Neugebauer
, and
J. E.
Northrup
,
J. Vac. Sci. Technol. B
16
,
2242
(
1998
).
13.
M. Hansen, in Constitution of Binary Alloys, Metallurgy and Metallurgical Engineering Series, edited by R. F. Mehl (McGraw-Hill, Mahannation, 1958).
14.
M-H.
Kim
,
S-N.
Lee
,
Ch.
Huh
,
S. Y.
Park
,
J. Y.
Han
,
J. M.
Seo
, and
S. J.
Park
,
Phys. Rev. B
61
,
10966
(
2000
).
15.
H. S.
Venugopalan
,
S. E.
Mohney
,
B. P.
Luther
,
S. D.
Wolter
, and
J. M.
Redwing
,
J. Appl. Phys.
82
,
650
(
1997
).
16.
J. D.
Guo
,
F. M.
Pan
,
M. S.
Feng
,
R. J.
Guo
,
P. F.
Chou
, and
C. Y.
Chang
,
J. Appl. Phys.
80
,
1623
(
1996
).
17.
V. M.
Bermudez
,
J. Appl. Phys.
86
,
1170
(
1999
).
18.
W.
Mönch
,
J. Vac. Sci. Technol. B
17
,
1867
(
1999
).
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