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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S5 — Sep. 10, 2012
  • pp: A754–A764

Theoretical performance of multi-junction solar cells combining III-V and Si materials

Ian Mathews, Donagh O'Mahony, Brian Corbett, and Alan P. Morrison  »View Author Affiliations

Optics Express, Vol. 20, Issue S5, pp. A754-A764 (2012)

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A route to improving the overall efficiency of multi-junction solar cells employing conventional III-V and Si photovoltaic junctions is presented here. A simulation model was developed to consider the performance of several multi-junction solar cell structures in various multi-terminal configurations. For series connected, 2-terminal triple-junction solar cells, incorporating an AlGaAs top junction, a GaAs middle junction and either a Si or InGaAs bottom junction, it was found that the configuration with a Si bottom junction yielded a marginally higher one sun efficiency of 41.5% versus 41.3% for an InGaAs bottom junction. A significant efficiency gain of 1.8% over the two-terminal device can be achieved by providing an additional terminal to the Si bottom junction in a 3-junction mechanically stacked configuration. It is shown that the optimum performance can be achieved by employing a four-junction series-connected mechanically stacked device incorporating a Si subcell between top AlGaAs/GaAs and bottom In0.53Ga0.47As cells.

© 2012 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(230.0230) Optical devices : Optical devices
(350.6050) Other areas of optics : Solar energy

ToC Category:

Original Manuscript: April 26, 2012
Revised Manuscript: June 22, 2012
Manuscript Accepted: June 30, 2012
Published: August 29, 2012

Ian Mathews, Donagh O'Mahony, Brian Corbett, and Alan P. Morrison, "Theoretical performance of multi-junction solar cells combining III-V and Si materials," Opt. Express 20, A754-A764 (2012)

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