Post-deposition treatment (PDT) of the absorber layer with alkali fluorides has led to a significant increase in the efficiency of Cu(In,Ga)Se2 (CIGS) thin-film solar cells. In this contribution, we investigate the influence of alkali PDTs on the absorber's surface potential by means of Kelvin probe force microscopy (KPFM). To this end, we perform KPFM on cross sections of complete CIGS solar cells. To improve the reliability of the measurement procedure, we deposit a gold layer on top of the solar cell as a reference layer. Using this approach, we study the influence of RbF and KF PDT on the absorber's surface potential for CIGS solar cells with different absorber and buffer compositions. In all cases, an increased surface potential of the cross section of the absorber layer is measured for the cells with PDT.

1.
P.
Jackson
,
D.
Hariskos
,
R.
Wuerz
,
W.
Wischmann
, and
M.
Powalla
,
Phys. Status Solidi RRL
8
,
219
222
(
2014
).
2.
P.
Jackson
,
R.
Wuerz
,
D.
Hariskos
,
E.
Lotter
,
W.
Witte
, and
M.
Powalla
,
Phys. Status Solidi RRL
10
,
583
586
(
2016
).
3.
M.
Nakamura
,
K.
Yamaguchi
,
Y.
Kimoto
,
Y.
Yasaki
,
T.
Kato
, and
H.
Sugimoto
,
IEEE J. Photovoltaics
9
,
1863
1867
(
2019
).
4.
S.
Siebentritt
,
E.
Avancini
,
M.
Bär
,
J.
Bombsch
,
E.
Bourgeois
,
S.
Buecheler
,
R.
Carron
,
C.
Castro
,
S.
Duguay
,
R.
Félix
,
E.
Handick
,
D.
Hariskos
,
V.
Havu
,
P.
Jackson
,
H.-P.
Komsa
,
T.
Kunze
,
M.
Malitckaya
,
R.
Menozzi
,
M.
Nesladek
,
N.
Nicoara
,
M.
Puska
,
M.
Raghuwanshi
,
P.
Pareige
,
S.
Sadewasser
,
G.
Sozzi
,
A. N.
Tiwari
,
S.
Ueda
,
A.
Vilalta-Clemente
,
T. P.
Weiss
,
F.
Werner
,
R. G.
Wilks
,
W.
Witte
, and
M. H.
Wolter
,
Adv. Energy Mater.
10
,
1903752
(
2020
).
5.
M.
Powalla
,
S.
Paetel
,
E.
Ahlswede
,
R.
Wuerz
,
C. D.
Wessendorf
, and
T. M.
Friedlmeier
,
Appl. Phys. Rev.
5
,
041602
(
2018
).
6.
J. A.
Aguiar
,
A.
Stokes
,
C.-S.
Jiang
,
T.
Aoki
,
P. G.
Kotula
,
M. K.
Patel
,
B.
Gorman
, and
M.
Al-Jassim
,
Adv. Mater. Interfaces
3
,
1600013
(
2016
).
7.
N.
Nicoara
,
T.
Lepetit
,
L.
Arzel
,
S.
Harel
,
N.
Barreau
, and
S.
Sadewasser
,
Nat. Sci. Rep.
7
,
41361
(
2017
).
8.
N.
Nicoara
,
R.
Manaligod
,
P.
Jackson
,
D.
Hariskos
,
W.
Witte
,
G.
Sozzi
,
R.
Menozzi
, and
S.
Sadewasser
,
Nat. Commun.
10
,
3980
(
2019
).
9.
N.
Nicoara
,
T.
Kunze
,
P.
Jackson
,
D.
Hariskos
,
R. F.
Duarte
,
R. G.
Wilks
,
W.
Witte
,
M.
Bär
, and
S.
Sadewasser
,
ACS Appl. Mater. Interfaces
9
,
44173
44180
(
2017
).
10.
T.
Glatzel
,
H.
Steigert
,
S.
Sadewasser
,
R.
Klenk
, and
M. C.
Lux-Steiner
,
Thin Solid Films
480-481
,
177
182
(
2005
).
11.
C.-S.
Jiang
,
L. M.
Mansfield
,
S.
Glynn
,
C.
Xiao
,
R.
Garris
,
S.
Christensen
, and
M.
Al-Jassim
,
IEEE J. Photovoltaics
9
,
308
312
(
2019
).
12.
S.
Zahedi-Azad
,
M.
Maiberg
, and
R.
Scheer
,
Prog. Photovoltaics: Res. Appl.
28
,
1146
1157
(
2020
).
13.
S. Y.
Luchkin
and
K. J.
Stevenson
,
Microsc. Microanal.
24
,
126
131
(
2018
).
14.
T.
Glatzel
,
D.
Fuertes Marrón
,
T.
Schedel-Niedrig
,
S.
Sadewasser
, and
M. Ch.
Lux-Steiner
,
Appl. Phys. Lett.
81
,
2017
(
2002
).
15.
C.
Kim
,
C.
Bae
,
K.
Ryu
,
B.
Lee
, and
H.
Shin
,
Solid State Phenom.
124-126
,
607
610
(
2007
).
16.
L. M.
Eng
,
C.
Loppacher
, and
U.
Zerweck
,
MRS Proc.
838
,
O1.10
(
2004
).
17.
Z.
Zhang
,
Ph.D.
thesis,
KIT Scientific Publishing
, Karlsruhe,
2013
.
18.
F.
Chaabouni
,
M.
Abaab
, and
B.
Rezig
,
Sens. Actuators, B
100
,
200
204
(
2004
).
19.
J.
Xu
,
Q.
Pan
,
Y.
Shun
, and
Z.
Tian
,
Sens. Actuators, B
66
,
277
279
(
2000
).
20.
A.
Axt
,
I. M.
Hermes
,
V. W.
Bergmann
,
N.
Tausendpfund
, and
S. A. L.
Weber
,
Beilstein J. Nanotechnol.
9
,
1809
1819
(
2018
).
21.
Z.-H.
Zhang
,
X.-C.
Tang
,
U.
Lemmer
,
W.
Witte
,
O.
Kiowski
,
M.
Powalla
, and
H.
Hölscher
,
Appl. Phys. Lett.
99
,
042111
(
2011
).
22.
M.
DeJarld
,
P. M.
Campbell
,
A. L.
Friedman
,
M.
Currie
,
R. L.
Myers-Ward
,
A. K.
Boyd
,
S. G.
Rosenberg
,
S. P.
Pavunny
,
K. M.
Daniels
, and
D. K.
Gaskill
,
Sci. Rep.
8
,
16487
(
2018
).
23.
F.
Pianezzi
,
P.
Reinhard
,
A.
Chirilǎ
,
B.
Bissig
,
S.
Nishiwaki
,
S.
Buecheler
, and
A. N.
Tiwari
,
Phys. Chem. Chem. Phys.
16
,
8843
(
2014
).
24.
M.
Malitckaya
,
H.-P.
Komsa
,
V.
Havu
, and
M. J.
Pushka
,
J. Phys. Chem. C
121
,
15516
15528
(
2017
).
25.
T.
Kodalle
,
L.
Choubrac
,
L.
Arzel
,
R.
Schlatmann
,
N.
Barreau
, and
C. A.
Kaufmann
,
Sol. Energy Mater. Sol. Cells
200
,
109997
(
2019
).
26.
T.
Kodalle
,
R. K. M.
Raghupathy
,
T.
Bertram
,
N.
Maticiuc
,
H. A.
Yetkin
,
R.
Gunder
,
R.
Schlatmann
,
T. D.
Kühne
,
C. A.
Kaufmann
, and
H.
Mirhosseini
,
Phys. Status Solidi RRL
13
,
1800564
(
2019
).
27.
I.
Khatri
,
H.
Fukai
,
H.
Yamaguchi
,
M.
Sugiyama
, and
T.
Nakada
,
Sol. Energy Mater. Sol. Cells
155
,
280
287
(
2016
).
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