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タイトル: | Control of hot-carrier relaxation for realizing ideal quantum-dot intermediate-band solar cells. |
著者: | Tex, David M Kamiya, Itaru Kanemitsu, Yoshihiko https://orcid.org/0000-0002-0788-131X (unconfirmed) |
著者名の別形: | テックス, ディビット 神谷, 格 金光, 義彦 |
発行日: | 18-Feb-2014 |
出版者: | Nature Publishing Group |
誌名: | Scientific reports |
巻: | 4 |
論文番号: | 4125 |
抄録: | For intermediate-band solar cells, the broad absorption spectrum of quantum dots (QDs) offers a favorable conversion efficiency, and photocurrent generation via efficient two-step two-photon-absorption (TS-TPA) in QDs is essential for realizing high-performance solar cells. In the last decade, many works were dedicated to improve the TS-TPA efficiency by modifying the QD itself, however, the obtained results are far from the requirements for practical applications. To reveal the mechanisms behind the low TS-TPA efficiency in QDs, we report here on two- and three-beam photocurrent measurements of InAs quantum structures embedded in AlGaAs. Comparison of two- and three-beam photocurrent spectra obtained by subbandgap excitation reveals that the QD TS-TPA efficiency is improved significantly by suppressing the relaxation of hot TS-TPA carriers to unoccupied shallow InAs quantum structure states. |
記述: | 量子ナノ構造を利用した太陽電池の光キャリアの振る舞いを解明 -高効率太陽電池の実現に前進-.京都大学プレスリリース.2014-2-18. |
著作権等: | This work is licensed under a Creative Commons Attribution- NonCommercial-NoDerivs 3.0 Unported license. To view a copy of this license. |
URI: | http://hdl.handle.net/2433/182071 |
DOI(出版社版): | 10.1038/srep04125 |
PubMed ID: | 24535195 |
関連リンク: | https://www.kyoto-u.ac.jp/static/ja/news_data/h/h1/news6/2013_1/140218_1.htm |
出現コレクション: | 学術雑誌掲載論文等 |
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