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Advances in Bragg stack quantum well solar cells

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 May 2005 Italy Publisher:Elsevier BVJournal:Solar Energy Materials and Solar Cells, volume 87, pages 169-179 (issn: 0927-0248,

Authors: Johnson DC; Ballard I; Barnham KWJ; Bishnell DB; Connolly JP; Lynch MC; Tibbits TND; +5 Authors

doi: 10.1016/j.solmat.2004.09.014

handle: 20.500.14243/40850

Advances in Bragg stack quantum well solar cells

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Abstract

Abstract Strain-balanced quantum well solar cells (SB-QWSC) extend the photon absorption edge beyond that of bulk GaAs by incorporation of quantum wells in the i-region of a p–i–n device. The addition of a distributed Bragg reflector (DBR) can substantially increase the photocurrent with little or no detriment to the dark-current. Experimental results are presented that show improvements of DBR cell efficiencies over SB-QWSC's without DBR's. In addition, at high dark-current levels appropriate to high concentration, we observe that the dark-currents of the SB-QWSC's exhibit ideal diode behaviour. We present evidence that the ideality n = 1 dark-current is reduced in the DBR cells and discuss the possible efficiency improvements if the dark-current is radiatively dominant.

Country

Italy

Related Organizations

Institute for Microelectronics and Microsystems
Italy
National Research Council
Italy
Imperial College London
United Kingdom
Toyota Technological Institute
Japan
University of Sheffield
United Kingdom

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Keywords

[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]

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