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Proceedings Paper

Optimization of finger spacing for concentrator photovoltaic cells under non-uniform illumination using SPICE
Author(s): Pratibha Sharma; Alex Walker; Jeff Wheeldon; Henry Schriemer; Karin Hinzer
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Paper Abstract

Concentrator photovoltaic (CPV) technology has come a long way, with multi-junction solar cell efficiencies now reaching up to 44.4%. Front contact grid design, crucial for improving efficiency, is typically performed for uniform illumination, but this does not account for the real world conditions of non-homogeneous irradiance distributions. In this work, we aim to optimize finger spacing for a linear grid under non-uniform illumination by using Simulation Program with Integrated Circuit Emphasis (SPICE) analysis. A two-dimensional distributed resistance model is used to simulate a lattice matched, triple-junction solar cell whose design parameters are determined by curve-fitting current-voltage curves from each sub-cell to a two-diode equivalent-circuit model. Cell efficiency is considered to be a unimodal function that varies with finger spacing so a golden-section search optimization algorithm is used to determine the optimal spacing. Various Gaussian profiles are used to simulate non-uniform illumination and their effects on device performance. Designs based on optimal spacing for non-uniform illumination show an efficiency increase of more than 0.5% absolute at concentrations greater than 500 suns.

Paper Details

Date Published: 11 October 2013
PDF: 8 pages
Proc. SPIE 8915, Photonics North 2013, 891505 (11 October 2013); doi: 10.1117/12.2033340
Show Author Affiliations
Pratibha Sharma, Univ. of Ottawa (Canada)
Alex Walker, Univ. of Ottawa (Canada)
Jeff Wheeldon, Univ. of Ottawa (Canada)
Henry Schriemer, Univ. of Ottawa (Canada)
Karin Hinzer, Univ. of Ottawa (Canada)

Published in SPIE Proceedings Vol. 8915:
Photonics North 2013
Pavel Cheben; Jens Schmid; Caroline Boudoux; Lawrence R. Chen; André Delâge; Siegfried Janz; Raman Kashyap; David J. Lockwood; Hans-Peter Loock; Zetian Mi, Editor(s)

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