NDLI: Self-assembled SiO particle coating on 2 layer anti-reflection films for efficiency enhancement of GaAs PV cells

Content Provider	IEEE Xplore Digital Library
Author	Watanabe, K. Higo, A. Sugiyama, M. Nakano, Y.
Copyright Year	2010
Description	Author affiliation: Department of Electrical Engineering and Information Systems, School of Engineering, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656, Japan (Sugiyama, M.) \|\| Research Center for Advanced Science and Technology, the University of Tokyo, 4-6-1 Komaba, Meguro-ku, 153-8904, Japan (Watanabe, K.; Higo, A.; Nakano, Y.)
Abstract	An anti-reflection coating (ARC) with sub-micrometer size of structure has brought significant advantage in solar cell efficiency. Owing to the diffraction and light trapping effect caused by a sub-wavelength size of structure, the reduced reflectance covering a wide-wavelength can be expected at a surface of the photovoltaic (PV) cell. We proposed and tried a nano-scale structure fabrication by small-size particles combined with conventional 2 layers ARC on GaAs PV cells. The small-size spherical particles show well aligned self-assembly on the substrate when the solution containing micro-spheres were dried with a proper sheer force. Using the pure water solution of colloidal SiO2 spheres and an ordinal spin-coating technique, a well aligned mono-particle layer has been fabricated on the 2 layer ARC (TiO and SiO) on a GaAs PV cell. In this research, we tried 3 samples with different size of particles (400 nm, 200 nm and 100 nm in diameter). As the evaluation of PV cell, I–V characteristics under the AM1.5G illumination and external quantum efficiency (EQE) spectra were measured. For each sample, the I–V and EQE were obtained from the same sample: before and after application of particle coating. Measured relative efficiency enhancement of the additional mono-layer coating was +7.1, +5.7 and −0.3 in % for particle sizes of 100, 200 and 400 nm, respectively. As well as enhancement in light incorporation to the inside of a PV cell, there seem to be scattering loss by the particles on the cell. In the range of tested particle size, the smaller particle was preferable to avoid scattering loss and provides a larger efficiency enhancement to GaAs PV cells.
Starting Page	000205
Ending Page	000208
File Size	737350
Page Count	4
File Format	PDF
ISBN	9781424458905
ISSN	01608371
e-ISBN	9781424458929
DOI	10.1109/PVSC.2010.5614526
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Three dimensional displays Substrates Wavelength measurement Artificial intelligence Surface waves Gold
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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