We present a comparison of the potential distribution along the cross section of bilayer poly(3-hexylthiophene)/1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C61 (P3HT/PCBM) solar cells, which show normal and anomalous, S-shaped current-voltage (IV) characteristics. We expose the cross sections of the devices with a focussed ion beam and measure them with scanning Kelvin probe microscopy. We find that in the case of S-shaped IV-characteristics, there is a huge potential drop at the PCBM/Al top contact, which does not occur in solar cells with normal IV-characteristics. This behavior confirms the assumption that S-shaped curves are caused by hindered charge transport at interfaces.

1.
I.
Eisgruber
,
J.
Granata
,
J.
Sites
,
J.
Hou
, and
J.
Kessler
,
Sol. Energy Mater. Sol. Cells
53
,
367
(
1998
).
2.
C.
Uhrich
,
R.
Schueppel
,
A.
Petrich
,
M.
Pfeiffer
,
K.
Leo
,
E.
Brier
,
P.
Kilickiran
, and
P.
Baeuerle
,
Adv. Funct. Mater.
17
,
2991
(
2007
).
3.
A.
Kumar
,
S.
Sista
, and
Y.
Yang
,
J. Appl. Phys.
105
,
094512
(
2009
).
4.
A.
Wagenpfahl
,
D.
Rauh
,
M.
Binder
,
C.
Deibel
, and
V.
Dyakonov
,
Phys. Rev. B
82
,
115306
(
2010
).
5.
B. Y.
Finck
and
B. J.
Schwartz
,
Appl. Phys. Lett.
103
,
053306
(
2013
).
6.
B.
Tremolet de Villers
,
C. J.
Tassone
,
S. H.
Tolbert
, and
B. J.
Schwartz
,
J. Phys. Chem. C
113
,
18978
(
2009
).
7.
W.
Tress
,
A.
Petrich
,
M.
Hummert
,
M.
Hein
,
K.
Leo
, and
M.
Riede
,
Appl. Phys. Lett.
98
,
063301
(
2011
).
8.
A. L.
Ayzner
,
C. J.
Tassone
,
S. H.
Tolbert
, and
B. J.
Schwartz
,
J. Phys. Chem. C
113
,
20050
(
2009
).
9.
M.
Pfannmoeller
,
H.
Fluegge
,
G.
Benner
,
I.
Wacker
,
C.
Sommer
,
M.
Hanselmann
,
S.
Schmale
,
H.
Schmidt
,
F. A.
Hamprecht
,
T.
Rabe
,
R.
Schroeder
, and
W.
Kowalsky
,
Nano Lett.
11
,
3099
(
2011
).
10.
R.
Saive
,
M.
Scherer
,
C.
Mueller
,
D.
Daume
,
J.
Schinke
,
M.
Kroeger
, and
W.
Kowalsky
, “Imaging the electric potential within organic solar cells,”
Adv. Funct. Mater.
(published online 2013).
11.
M.
Scherer
,
R.
Saive
,
D.
Daume
,
M.
Kroeger
, and
W.
Kowalsky
,
AIP Adv.
3
,
092134
(
2013
).
12.
R.
Saive
,
L.
Mueller
,
E.
Mankel
,
W.
Kowalsky
, and
M.
Kroeger
,
Org. Electron.
14
,
1570
(
2013
).
13.
M.-C.
Wu
,
Y.-Y.
Lin
,
S.
Chen
,
H.-C.
Liao
,
Y.-J.
Wu
,
C.-W.
Chen
,
Y.-F.
Chen
, and
W.-F.
Su
,
Chem. Phys. Lett.
468
,
64
(
2009
).
14.
D. S. H.
Charrier
,
M.
Kemerink
,
B. E.
Smalbrugge
,
T.
de Vries
, and
R. A. J.
Janssen
,
ACS Nano
2
,
622
(
2008
).
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