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タイトル: Microscopic photoluminescence and photocurrent imaging spectroscopy of InAs nanostructures: Identification of photocarrier generation sites for intermediate-band solar cells
著者: Tex, David M.
Ihara, Toshiyuki  KAKEN_id
Kamiya, Itaru
Kanemitsu, Yoshihiko  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-0788-131X (unconfirmed)
著者名の別形: 金光, 義彦
発行日: 11-Mar-2014
出版者: American Physical Society
誌名: Physical Review B
巻: 89
号: 12
論文番号: 125301
抄録: We performed microscopic imaging of photoluminescence (PL) and photocurrent (PC) on InAs nanostructures including disklike structures (nanodisks) and quantum dots (QDs). The correlation between PL and PC images indicates that the major fraction of upconverted carriers originates from nanodisks. By analyzing the excitation spectra, we find evidence that nanodisks and QDs need to be spatially separated to enhance PC generation via upconversion. The efficient simultaneous use of both QDs and nanodisks is an alternative approach to intermediate-band solar cells, where low-energy photons are upconverted in the QDs and high-energy photons are efficiently upconverted in the nanodisks, resulting in enhanced carrier generation yields. With spatially resolved upconverted PL, we show that PC generation in nanodisks is due to ejection of both electrons and holes.
著作権等: © 2014 American Physical Society
URI: http://hdl.handle.net/2433/183990
DOI(出版社版): 10.1103/PhysRevB.89.125301
出現コレクション:学術雑誌掲載論文等

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