Journal article
Radiative recombination of carriers in the GaxIn1−xP/GaAs double-junction tandem solar cells
Solar energy materials and solar cells, Vol.111, pp.102-106
04/2013
DOI: 10.1016/j.solmat.2012.12.025
Abstract
Radiative recombination of carriers in two kinds of GaxIn1−xP/GaAs double-junction tandem solar cell structures was investigated by using room-temperature electroluminescence (EL) and photoluminescence (PL) techniques. Efficient radiative recombination was observed simultaneously in the top and the bottom subcells in both the samples. By studying the behavior of EL and PL spectra, the radiative recombination intensity ΦEL was demonstrated to be reliant on the material-dependent radiative recombination coefficient, base layer doping concentration and thickness. Furthermore, dependence of ΦEL on substrate misorientation in both the subcells was also evidenced, which was explained in terms of the growth-induced variations in microstructure for the GaInP top cell and in potential barrier profile across the p–n junction for the GaAs bottom cell. Based on these observations, the radiative recombination in the two base layers of the subcells was demonstrated to be the major carrier loss mechanism in the GaxIn1−xP/GaAs double-junction tandem photovoltaic devices and should be suppressed.
► Carrier recombination in two kinds of GaxIn1−xP/GaAs double-junction tandem solar cells is studied. ► Strong radiative recombination is revealed and mainly occurs in the base layers of subcells. ► Intensity is shown to be dependent on the cell recombination properties and growth conditions. ► Radiative recombination should be suppressed to enhance the conversion efficiency.
Details
- Title: Subtitle
- Radiative recombination of carriers in the GaxIn1−xP/GaAs double-junction tandem solar cells
- Creators
- Z. Deng - University of Hong KongR.X. Wang - Suzhou Institute of Nano-tech and Nano-bionicsJ.Q. Ning - University of Hong KongC.C. Zheng - University of Hong KongW. Bao - University of Hong KongS.J. Xu - University of Hong KongX.D. Zhang - Suzhou Institute of Nano-tech and Nano-bionicsS.L. Lu - Suzhou Institute of Nano-tech and Nano-bionicsJ.R. Dong - Suzhou Institute of Nano-tech and Nano-bionicsB.S. Zhang - Suzhou Institute of Nano-tech and Nano-bionicsH. Yang - University of Hong Kong
- Resource Type
- Journal article
- Publication Details
- Solar energy materials and solar cells, Vol.111, pp.102-106
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.solmat.2012.12.025
- ISSN
- 0927-0248
- eISSN
- 1879-3398
- Language
- English
- Date published
- 04/2013
- Academic Unit
- Epidemiology
- Record Identifier
- 9984363625302771
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