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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S5 — Aug. 25, 2014
  • pp: A1270–A1277

Advancing tandem solar cells by spectrally selective multilayer intermediate reflectors

Andre Hoffmann, Ulrich W. Paetzold, Chao Zhang, Tsvetelina Merdzhanova, Andreas Lambertz, Carolin Ulbrich, Karsten Bittkau, and Uwe Rau  »View Author Affiliations


Optics Express, Vol. 22, Issue S5, pp. A1270-A1277 (2014)
http://dx.doi.org/10.1364/OE.22.0A1270


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Abstract

Thin-film silicon tandem solar cells are composed of an amorphous silicon top cell and a microcrystalline silicon bottom cell, stacked and connected in series. In order to match the photocurrents of the top cell and the bottom cell, a proper photon management is required. Up to date, single-layer intermediate reflectors of limited spectral selectivity are applied to match the photocurrents of the top and the bottom cell. In this paper, we design and prototype multilayer intermediate reflectors based on aluminum doped zinc oxide and doped microcrystalline silicon oxide with a spectrally selective reflectance allowing for improved current matching and an overall increase of the charge carrier generation. The intermediate reflectors are successfully integrated into state-of-the-art tandem solar cells resulting in an increase of overall short-circuit current density by 0.7 mA/cm2 in comparison to a tandem solar cell with the standard single-layer intermediate reflector.

© 2014 Optical Society of America

OCIS Codes
(040.5350) Detectors : Photovoltaic
(350.4238) Other areas of optics : Nanophotonics and photonic crystals

ToC Category:
Light Trapping for Photovoltaics

History
Original Manuscript: February 17, 2014
Revised Manuscript: April 17, 2014
Manuscript Accepted: April 17, 2014
Published: July 28, 2014

Citation
Andre Hoffmann, Ulrich W. Paetzold, Chao Zhang, Tsvetelina Merdzhanova, Andreas Lambertz, Carolin Ulbrich, Karsten Bittkau, and Uwe Rau, "Advancing tandem solar cells by spectrally selective multilayer intermediate reflectors," Opt. Express 22, A1270-A1277 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S5-A1270


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