TY - JOUR
T1 - Optical properties of AlxGa1-xAs/GaAs superlattice solar cells
AU - Kuramoto, Makoto
AU - Urabe, Hiroyuki
AU - Nakano, Tomohiro
AU - Kawaharazuka, Atsushi
AU - Nishinaga, Jiro
AU - Makimoto, Toshiki
AU - Horikoshi, Yoshiji
N1 - Funding Information:
This work is partly supported by the Grant-in-Aid for Scientific Research (B) ( 23360163 ) from Japan Society for the Promotion of Science (JSPS).
Publisher Copyright:
© 2015 Elsevier B.V.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2015/7/28
Y1 - 2015/7/28
N2 - The effect of excitons in AlxGa1-xAs/GaAs superlattice solar cells has been investigated. We have shown that the superlattice active layers are effective to improve the solar cell performances because of the exciton enhanced photo-absorption. External quantum efficiency spectra show sharp and intense increase at the absorption edge due to excitonic absorption. This result indicates that excitonic photo-absorption can be stabilized at room temperature by using a superlattice structure. Optical properties of superlattice solar cells depend on the superlattice parameters because they determine the excitonic confinement effect, the tunneling effect and the sub-band structure. In this study, we compare external quantum efficiency for solar cells with different superlattice parameters to optimize the structure. The optimal barrier layer thickness is determined to be 1 nm for the Al0.5Ga0.5As/GaAs superlattice solar cell with 2-μm-thick active layer.
AB - The effect of excitons in AlxGa1-xAs/GaAs superlattice solar cells has been investigated. We have shown that the superlattice active layers are effective to improve the solar cell performances because of the exciton enhanced photo-absorption. External quantum efficiency spectra show sharp and intense increase at the absorption edge due to excitonic absorption. This result indicates that excitonic photo-absorption can be stabilized at room temperature by using a superlattice structure. Optical properties of superlattice solar cells depend on the superlattice parameters because they determine the excitonic confinement effect, the tunneling effect and the sub-band structure. In this study, we compare external quantum efficiency for solar cells with different superlattice parameters to optimize the structure. The optimal barrier layer thickness is determined to be 1 nm for the Al0.5Ga0.5As/GaAs superlattice solar cell with 2-μm-thick active layer.
KW - A3. Molecular beam epitaxy
KW - A3. Superlattices
KW - B2. Semiconducting gallium arsenide
KW - B3. Solar cells
UR - http://www.scopus.com/inward/record.url?scp=84938058404&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84938058404&partnerID=8YFLogxK
U2 - 10.1016/j.jcrysgro.2015.03.024
DO - 10.1016/j.jcrysgro.2015.03.024
M3 - Article
AN - SCOPUS:84938058404
SN - 0022-0248
VL - 425
SP - 333
EP - 336
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
ER -