We report on III-nitride photovoltaic cells with external quantum efficiency as high as 63%. InxGa1xN/GaNp-i-n double heterojunction solar cells are grown by metal-organic chemical vapor deposition on (0001) sapphire substrates with xIn=12%. A reciprocal space map of the epitaxial structure showed that the InGaN was coherently strained to the GaN buffer. The solar cells have a fill factor of 75%, short circuit current density of 4.2mA/cm2, and open circuit voltage of 1.81 V under concentrated AM0 illumination. It was observed that the external quantum efficiency can be improved by optimizing the top contact grid.

1.
S.
Nakamura
and
G.
Fasol
,
The Blue Laser Diode
(
Springer
,
Berlin
,
2000
).
2.
S. J.
Pearton
and
F.
Ren
,
Adv. Mater. (Weinheim, Ger.)
12
,
1571
(
2000
).
3.
X.
Zhang
,
X.
Wang
,
H.
Xiao
,
C.
Yang
,
J.
Ran
,
C.
Wang
,
Q.
Hou
, and
J. L.
Li
,
J. Phys. D
40
,
7335
(
2007
).
4.
O.
Jani
,
I.
Ferguson
,
C.
Honsberg
, and
S.
Kurtz
,
Appl. Phys. Lett.
91
,
132117
(
2007
).
5.
J.
Wu
,
W.
Walukiewicz
,
K. M.
Yu
,
W.
Shan
,
J. W.
Ager
 III
,
E. E.
Haller
,
H.
Lu
,
W. J.
Schaff
,
W. K.
Metzger
, and
S.
Kurtz
,
J. Appl. Phys.
94
,
6477
(
2003
).
6.
V.
Davydov
,
A.
Klochikhin
,
R.
Seisyan
,
V.
Emtsev
,
S.
Ivanov
,
F.
Bechstedt
,
J.
Furthmüller
,
H.
Harima
,
A.
Mudryi
,
J.
Aderhold
,
O.
Semchinova
, and
J.
Graul
,
Phys. Status Solidi B
229
,
r1
(
2002
).
7.
J.
Wu
,
W.
Walukiewicz
,
K. M.
Yu
,
J. W.
Ager
 III
,
E. E.
Haller
,
H.
Lu
,
W. J.
Schaff
,
Y.
Saito
, and
Y.
Nanishi
,
Appl. Phys. Lett.
80
,
3967
(
2002
).
8.
T.
Matsuoka
,
H.
Okamoto
,
M.
Nakao
,
H.
Harima
, and
E.
Kurimoto
,
Appl. Phys. Lett.
81
,
1246
(
2002
).
9.
Y.
Saito
,
H.
Harima
,
E.
Kurimoto
,
T.
Yamaguchi
,
N.
Teraguchi
,
A.
Suzuki
,
T.
Araki
, and
Y.
Nanishi
,
Phys. Status Solidi B
234
,
796
(
2002
).
10.
A. J.
Ekpunobi
and
A. O. E.
Animalu
,
Superlattices Microstruct.
31
,
247
(
2002
).
11.
D. E.
Aspnes
and
A. A.
Studna
,
Phys. Rev. B
27
,
985
(
1983
).
12.
J. F.
Muth
,
J. H.
Lee
,
I. K.
Shmagin
,
R. M.
Kolbas
,
J.
Casey
,
B. P.
Keller
,
U. K.
Mishra
, and
S. P.
DenBaars
,
Appl. Phys. Lett.
71
,
2572
(
1997
).
13.
R.
Singh
,
D.
Doppalapudi
,
T. D.
Moustakas
, and
L. T.
Romano
,
Appl. Phys. Lett.
70
,
1089
(
1997
).
14.
L.
Zeng
,
Y.
Yi
,
C.
Hong
,
J.
Liu
,
N.
Feng
,
X.
Duan
,
L. C.
Kimerling
, and
B. A.
Alamariu
,
Appl. Phys. Lett.
89
,
111111
(
2006
).
15.
D.
Redfield
,
Appl. Phys. Lett.
25
,
647
(
1974
).
16.
P.
Kozodoy
,
J. P.
Ibbetson
,
H.
Marchand
,
P. T.
Fini
,
S.
Keller
,
J. S.
Speck
,
S. P.
DenBaars
, and
U. K.
Mishra
,
Appl. Phys. Lett.
73
,
975
(
1998
).
17.
I.
Kim
,
H.
Park
,
Y.
Park
, and
T.
Kim
,
Appl. Phys. Lett.
73
,
1634
(
1998
).
18.
Y. H.
Kim
,
C. S.
Kim
,
S. K.
Noh
,
J. Y.
Leem
,
K. Y.
Lim
,
B. S.
O
, and
J. P.
Song
, in
Materials and Devices for Optoelectronics MRS Proceedings Volume 722
, edited by
R. B.
Wehrspohn
,
R.
März
,
S.
Noda
, and
C.
Soukoulis
(
Materials Research Society
,
Pittsburgh
,
2002
), p.
193
.
19.
J.
Wu
,
W.
Walukiewicz
,
K. M.
Yu
,
J. W.
Ager
 III
,
E. E.
Haller
,
H.
Lu
, and
W. J.
Schaff
,
Appl. Phys. Lett.
80
,
4741
(
2002
).
20.
E. A.
Berkman
,
N. A.
El-Masry
,
A.
Emara
, and
S. M.
Bedair
,
Appl. Phys. Lett.
92
,
101118
(
2008
).
21.
M. J.
Bergmann
,
U.
Ozgur
,
J.
Casey
,
H. O.
Everitt
, and
J. F.
Muth
,
Appl. Phys. Lett.
75
,
67
(
1999
).
You do not currently have access to this content.