Two-Color Photoexcitation in a GaNAs/AlGaAs Quantum Well Solar Cell

We demonstrate an efficient two-color photoexcitation process in a GaNAs/AlGaAs multiple quantum well (MQW) solar cell. The introduction of N into the GaAs MQW induces a marked reduction in bandgap energy, forming a large conduction band offset, and the formation of localized states. Owning to this...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2012-06, Vol.51 (6), p.06FF15-06FF15-3
Main Authors: Elborg, Martin, Jo, Masafumi, Ding, Yi, Noda, Takeshi, Mano, Takaaki, Sakoda, Kazuaki
Format: Article
Language:English
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Summary:We demonstrate an efficient two-color photoexcitation process in a GaNAs/AlGaAs multiple quantum well (MQW) solar cell. The introduction of N into the GaAs MQW induces a marked reduction in bandgap energy, forming a large conduction band offset, and the formation of localized states. Owning to this deep confinement, the thermal escape of photogenerated carriers from the QWs is greatly suppressed even at room temperature, resulting in a reduction in photocurrent. An additional photocurrent is generated by a two-color absorption process of sub-bandgap photons.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.51.06FF15