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Proceedings Paper

Two-dimensional ray-tracing model for light trapping in microgroove silicon solar cells
Author(s): M. Abdus Sobhan
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Paper Abstract

A 2-D ray tracing model incorporating light trapping effect to compute the optical generation rate (OGR) for light generated minority carriers in high efficiency micro-groove ((mu) G) silicon solar cells is presented. Based on the principles of geometrical optics, six major types of rays are identified which mainly contribute to light trapping in the (mu) G structure. Assuming .1 and 1.0 reflectances, respectively, on the front and back surfaces, our model computes light generated current density JL to be 53.79 mA/cm2 at AMO for a 100 micrometers thick cell. This value exhibits better agreement with ideal values as compared to those of other 1-D models existing in the literature. On the basis of OGR data from the model, a closed form 2-D OGR formula is developed using fast Fourier transform (FFT) technique. This formula facilitates the apply method of separation of variables to obtain closed form solutions of the 2-D minority carrier transport equations and satisfies the requirements for the boundary conditions therein for device modeling and analysis of (mu) G cells. Performance parameters of (mu) G cells predicted by our computer simulation agree fairly well with recent experimental results.

Paper Details

Date Published: 25 November 1992
PDF: 11 pages
Proc. SPIE 1727, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows, (25 November 1992); doi: 10.1117/12.130512
Show Author Affiliations
M. Abdus Sobhan, Rajshahi Univ. (Sweden)


Published in SPIE Proceedings Vol. 1727:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows

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