We have optimized a periodic antireflective nanostructure. The optimal design has a theoretical broadband reflectivity of 0.54% on top of GaInP with an AlInP window layer. Preliminary fabrication attempts have been carried out on top of GaAs substrates. Due to the lack of a window layer, and the need to fine tune the fabrication process, the fabricated nanostructures have a reflectivity of 3.1%, but this is already significantly lower than the theoretical broadband reflectance of standard MgF2/ZnS bilayers (4.5%).
REFERENCES
1.
M.
Victoria
, C.
Domínguez
, I.
Antón
& G.
Sala
. Antireflective coatings for multijunction solar cells under wide-angle ray bundles
. Optics Express
20
, 8136
–8147
(2012
).2.
W. H.
Southwell
. Gradient-index antireflection coatings
. Optics Letters
8
, 584
–586
(1983
).3.
E. B.
Grann
, M. G.
Moharam
& D. A.
Pommet
. Optimal design for antireflective tapered two-dimensional subwavelength grating structures
. Journal of the Optical Society of America A
12
, 333
–339
(1995
).4.
Z.
Yu
, A.
Raman
& S.
Fan
. Fundamental limit of nanophotonic light trapping in solar cells
. Proceedings of the National Academy of Sciences
107
, 17491
–17496
(2010
).5.
E. E.
Perl
, C.-T.
Lin
, W. E.
McMahon
, D. J.
Friedman
& J. E.
Bowers
. Ultrabroadband and Wide-Angle Hybrid Antireflection Coatings With Nanostructures
. IEEE Journal of Photovoltaics
4
, 962
–967
(2014
).6.
S. A.
Boden
& D. M.
Bagnall
. Optimization of moth-eye antireflection schemes for silicon solar cells
. Progress in Photovoltaics: Research and Applications
18
, 195
–203
(2010
).7.
J.
Tommila
, A.
Aho
, A.
Tukiainen
, V.
Polojärvi
, J.
Salmi
, T.
Niemi
& M.
Guina
. Moth-eye antireflection coating fabricated by nanoimprint lithography on 1 eV dilute nitride solar cell
. Progress in Photovoltaics: Research and Applications
21
, 1158
–1162
(2013
).8.
K. X.
Wang
, Z.
Yu
, V.
Liu
, Y.
Cui
& S.
Fan
. Absorption Enhancement in Ultrathin Crystalline Silicon Solar Cells with Antireflection and Light-Trapping Nanocone Gratings
. Nano Letters
12
, 1616
–1619
(2012
).9.
I.
Prieto
, B.
Galiana
, P. A.
Postigo
, C.
Algora
, L. J.
Martínez
& I.
Rey-Stolle
. Enhanced quantum efficiency of Ge solar cells by a two-dimensional photonic crystal nanostructured surface
. Applied Physics Letters
94
, 191102
(2009
).10.
M.
Otto
, M.
Algasinger
, H.
Branz
, B.
Gesemann
, T.
Gimpel
, K.
Füchsel
, T.
Käsebier
, S.
Kontermann
, S.
Koynov
, X.
Li
, V.
Naumann
, J.
Oh
, A. N.
Sprafke
, J.
Ziegler
, M.
Zilk
& R. B.
Wehrspohn
. Black Silicon Photovoltaics
. Advanced Optical Materials
3
, 147
–164
(2015
).11.
J. W.
Leem
, J. Su
Yu
, D.-H.
Jun
, J.
Heo
& W.-K.
Park
. Efficiency improvement of III–V GaAs solar cells using biomimetic TiO2 subwavelength structures with wide-angle and broadband antireflection properties
. Solar Energy Materials and Solar Cells
127
, 43
–49
(2014
).12.
M.-M.
Hung
, H.-V.
Han
, C.-Y.
Hong
, K.-H.
Hong
, T.-T.
Yang
, P.
Yu
, Y.-R.
Wu
, H.-Y.
Yeh
& H.-C.
Huang
. Compound biomimetic structures for efficiency enhancement of Ga0.5In0.5P/GaAs/Ge triple-junction solar cells
. Optics Express
22
, A295
–A300
(2014
).13.
C.-H.
Sun
, B. J.
Ho
, B.
Jiang
& P.
Jiang
. Biomimetic subwavelength antireflective gratings on GaAs
. Optics Letters
33
, 2224
–2226
(2008
).14.
S. L.
Diedenhofen
, G.
Grzela
, E.
Haverkamp
, G.
Bauhuis
, J.
Schermer
& J. G.
Rivas
. Broadband and omnidirectional anti-reflection layer for III/V multi-junction solar cells
. Solar Energy Materials and Solar Cells
101
, 308
–314
(2012
).15.
J.
Buencuerpo
, J. M.
Llorens
, P.
Zilio
, W.
Raja
, J.
Cunha
, A.
Alabastri
, R. P.
Zaccaria
, A.
Martí
& T.
Versloot
. Light-trapping in photon enhanced thermionic emitters
. Optics Express
23
, A1220
(2015
).16.
J.
Buencuerpo
, J. M.
Llorens
, M. L.
Dotor
& J. M.
Ripalda
. Photon management with nanostructures on concentrator solar cells
. Applied Physics Letters
103
, 083901
–083901
(2013
).17.
E. San
Román
, A.
Vitrey
, J.
Buencuerpo
, I.
Prieto
, J. M.
Llorens
, A.
García-Martín
, B.
Alén
, A.
Chaudhuri
, A.
Neumann
, S. R. J.
Brueck
& et al. Cloaking of solar cell contacts at the onset of Rayleigh scattering
. Scientific Reports
6
, 28669
(2016
).18.
J.
Buencuerpo
, J. M.
Llorens
, M. L.
Dotor
& J. M.
Ripalda
. Broadband antireflective nano-cones for tandem solar cells
. Optics Express
23
, A322
(2015
).19.
S.
Tanemura
, L.
Miao
, P.
Jin
, K.
Kaneko
, A.
Terai
& N.
Nabatova-Gabain
. Optical properties of polycrystalline and epitaxial anatase and rutile TiO2 thin films by rf magnetron sputtering
. Applied Surface Science
212–213
, 654
–660
(2003
).20.
J.
Buencuerpo
, L.
Torne
, R.
Alvaro
, J. M.
Llorens
, M. L.
Dotor
, and J. M.
Ripalda
, “Nano-cones for broadband light coupling to high index substrates
”, Scientific Reports
, 6
, 3868
(2016
).21.
C. P.
Fucetola
, H.
Korre
& K. K.
Berggren
. Low-cost interference lithography
. Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures
27
, 2958
(2009
).
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