Enhancement of optical transmission with random nanohole structures.

We demonstrate an enhancement of optical transmission by creating randomly distributed nanoholes in a glass surface using a simple bottom-up fabrication process. V-shaped holes with sub-100 nm diameter are created by anodized aluminum oxide template and dry etching on glass substrates. The broadband and omnidirectional antireflective effect of the proposed nanostructures is confirmed by measuring the transmittance of the patterned glasses, leading to 3% better transmission. Subsequently, the short-circuit current and the open-circuit voltage of a solar cell with nanostructures are enhanced by 3-4%, improving the solar cell efficiency from 10.47% to 11.20% after two weeks of outdoor testing.

[1]  G. Ding,et al.  Wetting on nanoporous alumina surface: transition between Wenzel and Cassie states controlled by surface structure. , 2008, Langmuir : the ACS journal of surfaces and colloids.

[2]  J. Hsu,et al.  ZnO nanostructures as efficient antireflection layers in solar cells. , 2008, Nano letters.

[3]  Seokwoo Jeon,et al.  Antireflection behavior of multidimensional nanostructures patterned using a conformable elastomeric phase mask in a single exposure step. , 2010, Small.

[4]  G. Michael Morris,et al.  Antireflection behavior of silicon subwavelength periodic structures for visible light , 1997 .

[5]  Guangzhao Mao,et al.  Colloidal subwavelength nanostructures for antireflection optical coatings. , 2005, Optics letters.

[6]  Heping Dong,et al.  Biomimetic Surfaces for High‐Performance Optics , 2009 .

[7]  C. Pan,et al.  Improved broadband and quasi-omnidirectional anti-reflection properties with biomimetic silicon nanostructures. , 2007, Nature nanotechnology.

[8]  Yoshiaki Kanamori,et al.  Antireflective subwavelength structures on crystalline Si fabricated using directly formed anodic porous alumina masks , 2006 .

[9]  Peng Jiang,et al.  Broadband moth-eye antireflec tion coatings on silicon , 2008 .

[10]  F. Ko,et al.  Self-organized tantalum oxide nanopyramidal arrays for antireflective structure , 2007 .

[11]  Kornelius Nielsch,et al.  Hexagonal pore arrays with a 50-420 nm interpore distance formed by self-organization in anodic alumina , 1998 .

[12]  Jianyu Liang,et al.  Two-dimensional lateral superlattices of nanostructures: Nonlithographic formation by anodic membrane template , 2002 .

[13]  C. Bernhard,et al.  Structural and functional adaptation in a visual system - Strukturelle und funktionelle Adaptation in einem visuellen System , 1967 .

[14]  Willem L. Vos,et al.  Broad‐band and Omnidirectional Antireflection Coatings Based on Semiconductor Nanorods , 2009 .

[15]  E. Gogolides,et al.  Highly anisotropic silicon reactive ion etching for nanofabrication using mixtures of SF6/CHF3 gases , 1997 .

[16]  Y. T. Lee,et al.  Light-extraction enhancement of red AlGaInP light-emitting diodes with antireflective subwavelength structures. , 2009, Optics express.

[17]  Peichen Yu,et al.  Broadband and omnidirectional antireflection employing disordered GaN nanopillars. , 2008, Optics express.

[18]  Lifeng Chi,et al.  Biomimetic antireflective Si nanopillar arrays. , 2008, Small.

[19]  J. Yu,et al.  Bioinspired parabola subwavelength structures for improved broadband antireflection. , 2010, Small.

[20]  Zongfu Yu,et al.  Optical absorption enhancement in amorphous silicon nanowire and nanocone arrays. , 2009, Nano letters.

[21]  M. Hutley,et al.  Reduction of Lens Reflexion by the “Moth Eye” Principle , 1973, Nature.

[22]  Weidong Zhou,et al.  Surface texturing by solution deposition for omnidirectional antireflection , 2007 .