Excitonic absorption on AlGaAs/GaAs superlattice solar cells

Jiro Nishinaga; Atsushi Kawaharazuka; Koji Onomitsu; Klaus H. Ploog; Yoshiji Horikoshi

doi:10.1002/pssc.201100276

Excitonic absorption on AlGaAs/GaAs superlattice solar cells

Jiro Nishinaga, Atsushi Kawaharazuka, Koji Onomitsu, Klaus H. Ploog, Yoshiji Horikoshi

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

The absorption characteristics of the solar cells with AlGaAs/GaAs superlattice active regions are investigated by external quantum efficiency measurements. The quantum efficiency spectra of the solar cells are well explained by the numerical analysis taking into account the excitonic effect on the photo-absorption. Excitonic absorption shows a strong and sharp peak at the absorption edge, and the excitonic effect also enhances the absorption in the energy region above the bandgap. The experimental quantum efficiencies well correspond to the calculated absorption spectra, and these results clearly indicate that the absorption is increased by excitons even at room temperature.

Original language	English
Pages (from-to)	330-333
Number of pages	4
Journal	Physica Status Solidi (C) Current Topics in Solid State Physics
Volume	9
Issue number	2
DOIs	https://doi.org/10.1002/pssc.201100276
Publication status	Published - 2012 Feb

Keywords

Excitonic absorption
GaAs
Solar cell
Superlattice

ASJC Scopus subject areas

Condensed Matter Physics

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title = "Excitonic absorption on AlGaAs/GaAs superlattice solar cells",

abstract = "The absorption characteristics of the solar cells with AlGaAs/GaAs superlattice active regions are investigated by external quantum efficiency measurements. The quantum efficiency spectra of the solar cells are well explained by the numerical analysis taking into account the excitonic effect on the photo-absorption. Excitonic absorption shows a strong and sharp peak at the absorption edge, and the excitonic effect also enhances the absorption in the energy region above the bandgap. The experimental quantum efficiencies well correspond to the calculated absorption spectra, and these results clearly indicate that the absorption is increased by excitons even at room temperature.",

keywords = "Excitonic absorption, GaAs, Solar cell, Superlattice",

author = "Jiro Nishinaga and Atsushi Kawaharazuka and Koji Onomitsu and Ploog, {Klaus H.} and Yoshiji Horikoshi",

year = "2012",

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doi = "10.1002/pssc.201100276",

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T1 - Excitonic absorption on AlGaAs/GaAs superlattice solar cells

AU - Nishinaga, Jiro

AU - Kawaharazuka, Atsushi

AU - Onomitsu, Koji

AU - Ploog, Klaus H.

AU - Horikoshi, Yoshiji

PY - 2012/2

Y1 - 2012/2

N2 - The absorption characteristics of the solar cells with AlGaAs/GaAs superlattice active regions are investigated by external quantum efficiency measurements. The quantum efficiency spectra of the solar cells are well explained by the numerical analysis taking into account the excitonic effect on the photo-absorption. Excitonic absorption shows a strong and sharp peak at the absorption edge, and the excitonic effect also enhances the absorption in the energy region above the bandgap. The experimental quantum efficiencies well correspond to the calculated absorption spectra, and these results clearly indicate that the absorption is increased by excitons even at room temperature.

AB - The absorption characteristics of the solar cells with AlGaAs/GaAs superlattice active regions are investigated by external quantum efficiency measurements. The quantum efficiency spectra of the solar cells are well explained by the numerical analysis taking into account the excitonic effect on the photo-absorption. Excitonic absorption shows a strong and sharp peak at the absorption edge, and the excitonic effect also enhances the absorption in the energy region above the bandgap. The experimental quantum efficiencies well correspond to the calculated absorption spectra, and these results clearly indicate that the absorption is increased by excitons even at room temperature.

KW - Excitonic absorption

KW - GaAs

KW - Solar cell

KW - Superlattice

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