A low band gap small molecule chromophore has been incorporated into a polymer/fullerene bulk heterojunction (BHJ) solar cell yielding increased carrier generation in the near infrared and increased overall short circuit current. The use of a small concentration of a soluble oligothiophene with a diketopyrrolopyrrole core can extend the absorption and photocurrent of poly(3-hexyl thiophene):[6,6]-phenyl C71 butyric acid methyl ester solar cells to 800 nm. Photocurrent from the dye embedded within the polymer BHJ is demonstrated, and the use of soluble small molecule sensitizers as a path toward high efficiency solar cells is discussed.

1.
B. C.
Thompson
and
J. M. J.
Frechet
,
Angew. Chem., Int. Ed.
47
,
58
(
2008
).
2.
C. J.
Brabec
and
J. R.
Durrant
,
MRS Bull.
33
,
670
(
2008
).
3.
J.
Peet
,
J. Y.
Kim
,
N. E.
Coates
,
W. L.
Ma
,
D.
Moses
,
A. J.
Heeger
, and
G. C.
Bazan
,
Nature Mater.
6
,
497
(
2007
).
4.
M. M.
Wienk
,
M.
Turbiez
,
J.
Gilot
, and
R. A.
Janssen
,
Adv. Mater. (Weinheim, Ger.)
20
,
2556
(
2008
).
5.
J. A.
Hauch
,
P.
Schilinsky
,
S. A.
Choulis
,
R.
Childers
,
M.
Biele
, and
C. J.
Brabec
,
Sol. Energy Mater. Sol. Cells
92
,
727
(
2008
).
6.
C. N.
Hoth
,
P.
Schilinsky
,
S. A.
Choulis
, and
C. J.
Brabec
,
Nano Lett.
8
,
2806
(
2008
).
7.
F.
Padinger
,
C. J.
Brabec
,
T.
Fromherz
,
J. C.
Hummelen
, and
N. S.
Sariciftci
,
Opto-Electron. Rev.
8
,
280
(
2000
).
8.
W. J.
Belcher
,
K. I.
Wagner
, and
P. C.
Dastoor
,
Sol. Energy Mater. Sol. Cells
91
,
447
(
2007
).
9.
A.
Ltaief
,
R. B.
Chaabane
,
A.
Bouazizi
, and
J.
Davenas
,
Mater. Sci. Eng., C
26
,
344
(
2006
).
10.
A. B.
Tamayo
,
B.
Walker
, and
T. -Q.
Nguyen
,
J. Phys. Chem. C
112
,
11545
(
2008
).
11.
M. T.
Lloyd
,
A. C.
Mayer
,
S.
Subramanian
,
D. A.
Mourney
,
D. J.
Herman
,
A.
Bapat
,
J. E.
Anthony
, and
G. G.
Malliaras
,
J. Am. Chem. Soc.
129
,
9144
(
2007
).
12.
S.
Roquet
,
A.
Cravino
,
P.
Leriche
,
O.
Aleveque
,
P.
Frere
, and
J.
Roncali
,
J. Am. Chem. Soc.
128
,
3459
(
2006
).
13.
L.
Valentini
,
D.
Bagnis
,
A.
Marrocchi
,
M.
Seri
,
A.
Taticche
, and
J. M.
Kenny
,
Chem. Mater.
20
,
32
(
2008
).
14.
A. B.
Tamayo
,
X. -D.
Dang
,
B.
Walker
,
J. H.
Seo
, and
T. -Q.
Nguyen
(unpublished).
15.
A. J.
Cascio
,
J. E.
Lyon
,
M. M.
Beerbon
,
R.
Schlaf
,
Y.
Zhu
, and
S. A.
Jenekhe
,
Appl. Phys. Lett.
88
,
062104
(
2006
).
16.
K.
Akaike
,
K.
Kanai
,
H.
Yoshida
,
J.
Tsutsumi
,
T.
Nishi
,
N.
Sato
,
Y.
Ouchi
, and
K.
Seki
,
J. Appl. Phys.
104
,
023710
(
2008
).
17.
K.
Vandewal
,
A.
Gadisa
,
W. D.
Oosterbaan
,
S.
Bertho
,
F.
Banishoeib
,
I. V.
Severen
,
L.
Lutsen
,
T. J.
Cleij
,
D.
Vanderzande
, and
J. V.
Manca
,
Adv. Funct. Mater.
18
,
2064
(
2008
).
You do not currently have access to this content.