Wavelength-modulated spectroscopy of the sub-bandgap response of solar cell devices

A wavelength-modulation setup for measuring the differential photo-response of a GaSb/GaAs quantum ring solar cell structure is reported. The pseudo-monochromatic wavelength is modulated at the output of a conventional monochromator by means of a vibrating slit mechanism. The vibrating slit was able...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2016-01, Vol.480, p.88-90
Main Authors: Mandanirina, N.H., Botha, J.R., Wagener, M.C.
Format: Article
Language:English
Subjects:
Condensed matter
Constants
Flux
Flux correction
Gallium arsenide
Photovoltaic cells
Quantum dot solar cell
Slits
Solar cells
Wavelength-modulated photo-response
Wavelengths
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Summary:A wavelength-modulation setup for measuring the differential photo-response of a GaSb/GaAs quantum ring solar cell structure is reported. The pseudo-monochromatic wavelength is modulated at the output of a conventional monochromator by means of a vibrating slit mechanism. The vibrating slit was able to modulate the excitation wavelength up to 33nm. The intensity of the light beam was kept constant through a unique flux correction module, designed and built in-house. The setup enabled measurements in the near-infrared range (from 1000 to 1300nm), which is specifically used to probe the sub-band gap differential photo-response of GaAs solar cells.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2015.07.031