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タイトル: | Photo-Excited Electron and Hole Dynamics in Semiconductor Quantum Dots: Phonon-Induced Relaxation, Multiple Excito Generation and Recombination |
著者: | Kim, Hyeon-Deuk |
著者名の別形: | 金, 賢得 |
キーワード: | quantum dot photo-excited exciton dynamics Auger recombination multiple exciton generation/recombination photovoltaic device solar energy conversion |
発行日: | 26-Mar-2014 |
出版者: | The Physical Society of Japan |
誌名: | JPS Conference Proceedings |
巻: | 1 |
論文番号: | 12024 |
抄録: | Phonon-induced relaxation, multiple exciton generation and recombination (MEG and MER) govern optical properties and photo-excited dynamics in QDs. We simulated such photo-excited dynamics of electron and hole in semiconductor quantum dots (QD) by combining time-dependent ab initio density functional theory and non-adiabatic molecular dynamics. Our approach is based on atomictic simulations accounting for QD size, shape, defects, core–shell distribution, surface ligands, and charge trapping, which significantly influence the properties of photo-excited QDs. The calculated data were obtained as real-time photo-induced processes and described as various dynamics owing to the non-perturbative treatment of quantum transition dynamics. The simulations provide direct evidence that the high-frequency ligand modes on the QD surface play a key role in all of the electron–phonon relaxation, MEG and MER. The insights reported here suggest novel routes for controlling the photo-induced processes in semiconductor QDs and lead to new design principles for increasing efficiencies of photovoltaic devices. |
記述: | Proceedings of the 12th Asia Pacific Physics Conference (APPC12) : Makuhari, Japan, July 14–19, 2013 |
著作権等: | © 一般社団法人 日本物理学会(The Physical Society of Japan) This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/193530 |
DOI(出版社版): | 10.7566/JPSCP.1.012024 |
関連リンク: | http://journals.jps.jp/doi/book/10.7566/appc12 |
出現コレクション: | 学術雑誌掲載論文等 |

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