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タイトル: | Investigation of the open-circuit voltage in solar cells doped with quantum dots. |
著者: | Tayagaki, Takeshi Hoshi, Yusuke Usami, Noritaka |
著者名の別形: | 太野垣, 健 星, 裕介 宇佐美, 徳隆 |
発行日: | 2013 |
出版者: | Nature Publishing Group |
誌名: | Scientific reports |
巻: | 3 |
論文番号: | 2703 |
抄録: | Quantum dots (QDs) have attracted much attention for use in photovoltaic applications because of their potential for overcoming the limits of conventional single-junction devices. One problem associated with solar cells using QDs is that the open-circuit voltage (Voc) always decreases with the addition of QDs with respect to the reference cell without QDs. Here, we report the investigation of current-voltage characteristics in Ge/Si QD solar cells in the temperature range from 100 to 300 K. We show that even though Voc decreases with increasing temperature, it depends on the nominal Ge thickness, indicating that Voc reduction is primarily caused by a decrease in the bandgap energy of the cell. From photoluminescence decay measurements, we found that rapid carrier extraction from QDs occurred in the solar cells; this process eliminates the quasi-Fermi energy splitting between the QDs and the host semiconductor and causes Voc reduction in QD solar cells. |
記述: | 量子ドットを用いた結晶シリコン太陽電池の高効率化に向けた設計指針を提供. 京都大学プレスリリース. 2013-09-26. |
著作権等: | © 2013 Nature Publishing Group This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/ |
URI: | http://hdl.handle.net/2433/178904 |
DOI(出版社版): | 10.1038/srep02703 |
PubMed ID: | 24067805 |
関連リンク: | https://www.kyoto-u.ac.jp/static/ja/news_data/h/h1/news6/2013/130926_2.htm |
出現コレクション: | 学術雑誌掲載論文等 |
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