Technical Briefs

Fabrication of Large Surface Area Semitransparent Monocrystalline Si Solar Cells

[+] Author and Article Information
E. Skuras

e-mail: eskuras@cc.uoi.gr
Department of Materials Engineering,
University of Ioannina,
Ioannina 45110, Greece

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received July 25, 2011; final manuscript received February 26, 2013; published online May 31, 2013. Assoc. Editor: Santiago Silvestre.

J. Sol. Energy Eng 135(3), 034503 (May 31, 2013) (4 pages) Paper No: SOL-11-1158; doi: 10.1115/1.4024241 History: Received July 25, 2011; Revised February 26, 2013

An experimental technique is presented for fabricating large surface area semitransparent monocrystalline Si solar cells. The semitransparency is achieved by laser-cutting two-dimensional periodic lattices of ellipses through industrially manufactured Si cells. A novel two-level metal base was invented for minimizing cell breakages during laser cutting. The periodic lattices consist of a large number of ellipses, so as to achieve uniform distribution of the transmitted solar radiation. High efficiencies over 13% are deduced from the I–V curves, recorded under physical sunlight, for all fabricated cells with a 5% transparency.

Copyright © 2013 by ASME
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Fig. 1

Shows the upper and rear side of a two-level base consisting of two aligned and welded parallel iron plates. A two-dimensional periodic pattern of ellipses is cut through the 4 mm thick lower iron plate. The lengths of their minor and major axes are 3.4 and 14 mm, respectively.

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Fig. 2

Shows detailed views of two different metal bases. The lengths of the minor and major axes of the ellipses cut through the lower iron plates are 3.4 and 14 mm, respectively, for base (a) and 3.2 and 12 mm for (b).

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Fig. 3

Positions of the laser beam and its center, shown with a gray circle and a black dot, respectively, relative to the perimeter of a designed ellipse

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Fig. 4

An 156 × 156 mm2 three-bus-bar semitransparent Si solar cell is shown. Its 5.4% transparency is achieved by laser cutting a periodic pattern of 106 ellipses through the surface of a commercially manufactured standard Si cell.

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Fig. 5

I–V and P–V curves, recorded at 930 Watt/m2 for a 156 × 156 mm2 two-bus-bar semitransparent Si solar cell with 91 ellipses uniformly distributed on its surface




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