In this study, commercially available white paint is used as a pigmented dielectric reflector (PDR) in the fabrication of a low-cost back electrode stack with an Al-doped ZnO (AZO) layer for thin-film silicon solar cell applications. An initial AZO film was deposited by the radio-frequency magnetron sputtering method. In order to obtain the highest transmittance and lowest resistivity of AZO film, process parameters such as sputtering power and substrate temperature were investigated. The optimal 100-nm-thick AZO film with low resistivity and high transmittance in the visible region are 6.4 × 10−3 Ω·cm and above 80%, respectively. Using glue-like white paint doped withTiO2 nanoparticles as the PDR enhances the external quantum efficiency (EQE) of a microcrystalline silicon absorptive layer owing to the doped white particles improving Fabry–Pérot interference (FPI), which raises reflectance and scattering ability. To realize the cost down requirement, decreasing the noble metal film thickness such as a 30-nm-thick silver reflector film, and a small doping particle diameter (D50 = 135 nm) and a high solid content (20%) lead to FPI improvement and a great EQE, which is attributed to improved scattering and reflectivity because of optimum diameter (Dopt) and thicker PDR film. The results indicate that white paint can be used as a reflector coating in low-cost back-electrode structures in high-performance electronics.

References

References
1.
Tanaka
,
M.
,
Taguchi
,
M.
,
Matsuyama
,
T.
,
Sawada
,
T.
,
Tsuda
,
S.
,
Nakano
,
S.
,
Hanafusa
,
H.
, and
Kuwano
,
Y.
,
1992
, “
Development of New a-Si/c-Si Heterojunction Solar Cells: ACJ-HIT (Artificially Constructed Junction-Heterojunction With Intrinsic Thin-Layer)
,”
Jpn. J. Appl. Phys., Part 1
,
31
, pp.
3518
3522
.10.1143/JJAP.31.3518
2.
Lu
,
W.-L.
,
Huang
,
K.-C.
,
Yeh
,
C.-H.
,
Hung
,
C.-I.
, and
Houng
,
M.-P.
,
2011
, “
Investigation of Textured Al-Doped ZnO Thin Films Using Chemical Wet-Etching Methods
,”
Mater. Chem. Phys.
,
127
, pp.
358
363
.10.1016/j.matchemphys.2011.02.019
3.
Berginski
,
M.
,
Hüpkes
,
J. R.
,
Schulte
,
M.
,
Schöpe
,
G.
,
Stiebig
,
H.
,
Rech
,
B.
,
Wuttig
,
M.
,
2007
, “
The Effect of Front ZnO:Al Surface Texture and Optical Transparency on Efficient Light Trapping in Silicon Thin-Film Solar Cells
,”
J. Appl. Phys.
,
101
, p.
074903
.10.1063/1.2715554
4.
Braig
,
C.
, 2011, “
Fabry-Pérot Interferometer
,” Abbe School of Photonics, Jena, Germany, available at: http://www.yumpu.com/en/document/view/4833543/fabry-perot-abbe-school-of-photonics
5.
Ferry
,
V. E.
,
Sweatlock
,
L. A.,
Pacifici
,
D.
, and
Atwater
,
H. A.
,
2008
,
“Plasmonic Nanostructure Design for Efficient Light Coupling Into Solar Cells
,”
Nano Lett.
,
8
(12), pp.
4391
4397
.10.1021/nl8022548
6.
Yue
,
G.
,
Sivec
,
L.
,
Owens
,
J. M.
,
Yan
,
B.
,
Yang
,
J.
, and
Guha
,
S.
,
2009
, “
Optimization of Back Reflector for High Efficiency Hydrogenated Nanocrystalline Silicon Solar Cells
,”
Appl. Phys. Lett.
,
95
, p.
263501
.10.1063/1.3279143
7.
Müller
,
J.
,
Rech
,
B.
,
Springer
,
J.
, and
Vanecek
,
M.
,
2004
, “
TCO and Light Trapping in Silicon Thin Film Solar Cells
,”
Solar Energy
,
77
, pp.
917
930
.10.1016/j.solener.2004.03.015
8.
Rech
,
B.
,
Repmann
,
T.
,
van den Donker
,
M. N.
,
Berginski
,
M.
,
Kilper
,
T.
,
Hüpkes
,
J.
, Calnan, S., Stiebig, H., and Wieder, S.,
2006
. “
Challenges in Microcrystalline Silicon Based Solar Cell Technology
,”
Thin Solid Films
,
511-512
, pp.
548
555
.10.1016/j.tsf.2005.12.161
9.
Haacke
,
G.
,
1977
, “
Transparent Conducting Coatings
,”
Annu. Rev. Mater. Sci.
,
7
, pp.
73
93
.10.1146/annurev.ms.07.080177.000445
10.
Ö
zgür
,
U.
,
Alivov
,
Y. I.
,
Liu
,
C.
,
Teke
,
A.
,
Reshchikov
,
M. A.
,
Doğan
,
S.
,
Avrutin
,
V.,
Cho
,
S. J.,
and
Morkoç
,
H.,
2005
, “
A Comprehensive Review of ZnO Materials and Devices
,”
J. Appl. Phys.
,
98
, p.
041301
.10.1063/1.1992666
11.
Lu
,
Y. Z. J.
,
Ye
,
Z.
,
Wang
,
L.
,
Zhao
,
B.
, and
Huang
,
J.
,
2003
, “
p-Type ZnO Films Deposited by DC Reactive Magnetron Sputtering at Different Ammonia Concentrations
,”
Mater. Lett.
,
57
, pp.
3311
3314
.10.1016/S0167-577X(03)00054-5
12.
Cotter
,
J. E.
,
Hall
,
R. B.
,
Mauk
,
M. G.
, and
Barnett
,
A. M.
,
1999
, “
Light Trapping in Silicon-Film Solar Cells With Rear Pigmented Dielectric Reflectors
,”
Prog. Photovolt: Res. Appl.
,
7
(4), pp.
261
274
.10.1002/(SICI)1099-159X(199907/08)7:4<261::AID-PIP256>3.0.CO;2-A
13.
Hedler
,
J. E. A.
,
Wachtendorf
,
Ch.
,
Correia
,
S.
,
Gutlapalli
,
R.
,
Messerschmidt
,
D.
, and
Koitzsch
,
Ch.
,
2009
, “
White Back Reflector On Sputtered Zinc Oxide Back Contact For Micromorph Silicon Thin-Film Solar Modules
,” 34th IEEE Photovoltaic Specialists Conference (
PVSC
), Philadelphia, PA, June 7–12, pp. 001102-001106. 10.1109/PVSC.2009.5411212
14.
Berger
,
O.
,
Inns
,
D.
, and
Aberle
,
A. G.
,
2007
, “
Commercial White Paint as Back Surface Reflector For Thin-Film Solar Cells
,”
Sol. Energy Mater. Sol. Cells
,
91
, pp.
1215
1221
.10.1016/j.solmat.2007.04.008
15.
Rech
,
B.
, and
Wagner
,
H.
,
1999
, “
Potential of Amorphous Silicon for Solar Cells
,”
Appl. Phys. A: Mater. Sci. Process.
,
69
, pp.
155
167
.10.1007/s003390050986
16.
Bréchignac
,
C.
,
Cahuzac
,
P.
,
Carlier
,
F.
,
de Frutos
,
M.
,
Masson
,
A.
,
Mory
,
C.
,
Colliex
,
C.
, and
Yoon
,
B.,
1998
, “
Size Effects in Nucleation and Growth Processes From Preformed Soft-Landed Clusters
,”
Phys. Rev. B
,
57
, pp.
2084
2087
.10.1103/PhysRevB.57.R2084
17.
Mass
,
J.
,
Bhattacharya
,
P.
, and
Katiyar
,
R.
,
2003
, “
Effect of High Substrate Temperature on Al-Doped ZnO Thin Films Grown by Pulsed Laser Deposition
,”
Mater. Sci. Eng., B
,
103
, pp.
9
15
.10.1016/S0921-5107(03)00127-2
18.
Meyer
,
K.
,
Schuller
,
I. K.
, and
Falco
,
C. M.
,
1981
, “
Thermalization of Sputtered Atoms
,”
J. Appl. Phys.
,
52
, pp.
5803
5805
.10.1063/1.329473
19.
Lai
,
K.-C.
,
Wang
,
J.-H.
,
Lu
,
C.-H.
,
Tsai
,
F.-J.
,
Yeh
,
C.-H.
, and
Houng
,
M.-P.
,
2011
, “
Plasma-Induced TCO Texture of ZnO:Ga Back Contacts on Silicon Thin Film Solar Cells
,”
Sol. Energy Mater. Sol. Cells
,
95
, pp.
415
418
.10.1016/j.solmat.2010.10.010
20.
Levinson
,
R.
,
Berdahl
,
P.
, and
Akbari
,
H.
,
2005
, “
Solar Spectral Optical Properties of Pigments—Part I: Model for Deriving Scattering and Absorption Coefficients From Transmittance and Reflectance Measurements
,”
Sol. Energy Mater. Sol. Cells
,
89
, pp.
319
349
.10.1016/j.solmat.2004.11.012
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