Optimisation of the physical properties of InAs/InGaAs/GaAs QDs heterostructures embedded p-i-n GaAs solar cell
by Maher Ezzdini; Bilel Azeza; Saoussen Rekaya; Mohamed Helmi Hadj Alouane; Larbi Sfaxi; Ridha M'ghaieth; Nicolas Chauvin; Hassen Maaref; Catherine Bru-Chevallier
International Journal of Nanotechnology (IJNT), Vol. 10, No. 5/6/7, 2013

Abstract: In order to enhance absorption at infrared range for GaAs-based solar cell, we have grown multi-stacked InAs/InGaAs/GaAs quantum dots (QDs) heterostructure in the active region by Solid-Source Molecular Beam Epitaxy (SS-MBE). Two different families of dots were observed in the photoluminescence (PL) spectra. Temperature-dependent study was carried out at 10-240 K temperature range. Distinctive, asymmetric shape located in the high energy for the PL spectra of the QD solar cell sample can be deconvoluted in two sub-bands. From the temperature-dependent PL measurement, the two sub-bands are associated with the ground-state emission from the two families of InAs dots with different size. Besides, the spectral response of multi-stacked InAs/InGaAs QD solar cells extends the photo-absorption spectra towards a wavelength longer than the GaAs bandgap of 1280 nm. However, the QDs solar cell shows an enhanced short-circuits current density of 7.8 mA/cm² compared to the GaAs reference cell. The performance of the QD solar cells indicates that the InAs/InGaAs/GaAs QD heterostructures facilitate the fabrication of highly stacked QD layers that are suitable for solar cells devices requiring thick QD layers for sufficient light absorption.

Online publication date: Sat, 27-Apr-2013

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