Frequency response of the external quantum efficiency in multijunction solar cells

The frequency dependence of the external quantum efficiency (EQE) of high-quality multijunction solar cells was examined by the modulated photocurrent spectroscopy method via an optical setup comprised of a light-pipe-coupled compact LED array. The optical excitation was achieved through sinusoidal...

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Bibliographic Details
Published in:Optics express 2017-08, Vol.25 (16), p.A709-A721
Main Authors: Peraca, Nicolás Márquez, Bilir, D Taner, Hamadani, Behrang H
Format: Article
Language:English
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Summary:The frequency dependence of the external quantum efficiency (EQE) of high-quality multijunction solar cells was examined by the modulated photocurrent spectroscopy method via an optical setup comprised of a light-pipe-coupled compact LED array. The optical excitation was achieved through sinusoidal electrical modulation of an appropriate LED by a custom-designed, high bandwidth amplifier. We observed unique features in the amplitude and phase data of the EQE frequency sweeps that are very sensitive to various subcell parameters and light bias conditions. These features are discussed extensively within the context of an AC equivalent circuit model, showing remarkable agreement between the experimental data and the proposed model.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.00A709