The authors poly(3-hexylthiophene)/[6,6]-phenyl C61-butyric acid methyl ester present a technique for modifying the internal structure of bulk heterojunction films which yields significantly improved photoconductivity. This method comprises the addition of alkyl thiol molecules to the polymer/fullerene solution prior to spin coating. Based on the steady-state and transient photoconductivity measurements, the photoresponsivity is an order of magnitude greater than that in films spun from pristine solvent; additionally, the carrier mobility measurements indicate significant increase in the hole mobility, consistent with the enhanced structural order inferred from x-ray diffraction and optical absorption measurements.

1.
S. S.
Sun
and
N. S.
Sariciftci
,
Organic Photovoltaics
(
CRC
,
Boca Raton, FL
,
2005
), p.
217
.
2.
G.
Yu
,
J.
Gao
,
J. C.
Hummelen
,
F.
Wudl
, and
A. J.
Heeger
,
Science
270
,
1789
(
1995
).
3.
C. J.
Brabec
,
Sol. Energy Mater. Sol. Cells
83
,
273
(
2004
).
4.
D.
Moses
,
A.
Dogariu
, and
A. J.
Heeger
,
Phys. Rev. B
61
,
9373
(
2000
).
5.
D.
Moses
,
H.
Okumoto
,
D.
Comoretto
,
C. H.
Lee
,
A. J.
Heeger
,
T.
Ohnishi
, and
T.
Noguchi
,
Synth. Met.
84
,
539
(
2004
).
6.
Y.
Yang
,
C.
Soci
,
D.
Moses
, and
A. J.
Heeger
,
Synth. Met.
155
,
639
(
2005
).
7.
W.
Ma
,
C.
Yang
,
X.
Gong
,
K.
Lee
, and
A. J.
Heeger
,
Adv. Funct. Mater.
15
,
1617
(
2005
).
8.
G.
Li
,
V.
Shrotriya
,
J.
Huang
,
Y.
Yao
,
T.
Moriarty
,
K.
Emery
, and
Y.
Yang
,
Nat. Mater.
4
,
868
(
2005
).
9.
U.
Zhokhavets
,
T.
Erb
,
H.
Hoppe
,
G.
Gobsch
, and
N. S.
Sariciftci
,
Thin Solid Films
496
,
679
(
2006
).
10.
M.
Surin
,
Ph.
Leclere
,
R.
Lazzaroni
,
J. D.
Yuen
,
G.
Wang
,
D.
Moses
,
A. J.
Heeger
,
S.
Cho
, and
K.
Lee
,
J. Appl. Phys.
100
,
033712
(
2006
).
11.
C. H.
Lee
,
G.
Yu
,
D.
Moses
,
K.
Pakbaz
,
C.
Zhang
,
N. S.
Sariciftci
,
A. J.
Heeger
, and
F.
Wudl
,
Phys. Rev. B
48
,
15425
(
1993
).
12.
D. H.
Auston
,
IEEE J. Quantum Electron.
19
,
639
(
1983
).
13.
D.
Chirvase
,
J.
Parisi
,
J. C.
Hummelen
, and
V.
Dyakonov
,
Nanotechnology
15
,
1317
(
2004
).
14.
Y.
Kim
,
S.
Choulis
,
J.
Nelson
,
D. D. C.
Bradley
,
S.
Cook
, and
J. R.
Durant
,
Appl. Phys. Lett.
86
,
063502
(
2005
).
15.
E.
Hauff
,
J.
Pariai
, and
V.
Dyakonov
,
Thin Solid Films
511-512
,
506
(
2006
).
16.
H.
Sirringhaus
,
P. J.
Brown
,
R. H.
Friend
,
M. M.
Nielsen
,
K.
Bechgaard
,
B. M. W.
Langeveld-Voss
,
A. J. H.
Spiering
,
R. A. J.
Janssen
,
E. W.
Meijer
,
P.
Herwig
, and
D. M.
de Leeuw
,
Nature (London)
401
,
685
(
1999
).
17.
T.
Erb
,
U.
Zhokhavets
,
G.
Gobsch
,
S.
Raleva
,
B.
Stühn
,
P.
Schilinsky
,
C.
Waldauf
, and
C. J.
Brabec
,
Adv. Funct. Mater.
15
,
1193
(
2005
).
18.
D.
Moses
,
M.
Sinclair
,
S.
Phillips
, and
A. J.
Heeger
,
Synth. Met.
28
,
D675
(
1989
).
You do not currently have access to this content.