Ultrafast Carrier Dynamics and Hot Electron Extraction in Tetrapod-Shaped CdSe Nanocrystals
-
- Pengtao Jing
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033, China
-
- Wenyu Ji
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033, China
-
- Xi Yuan
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China
-
- Songnan Qu
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033, China
-
- Renguo Xie
- College of Chemistry, Jilin University, Changchun 130012, China
-
- Michio Ikezawa
- Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
-
- Jialong Zhao
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China
-
- Haibo Li
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China
-
- Yasuaki Masumoto
- Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
書誌事項
- 公開日
- 2015-04-13
- 資源種別
- journal article
- DOI
-
- 10.1021/am5091148
- 公開者
- American Chemical Society (ACS)
この論文をさがす
説明
The ultrafast carrier dynamics and hot electron extraction in tetrapod-shaped CdSe nanocrystals was studied by femtosecond transient absorption (TA) spectroscopy. The carriers relaxation process from the higher electronic states (CB2, CB3(2), and CB4) to the lowest electronic state (CB1) was demonstrated to have a time constant of 1.04 ps, resulting from the spatial electron transfer from arms to a core. The lowest electronic state in the central core exhibited a long decay time of 5.07 ns in agreement with the reported theoretical calculation. The state filling mechanism and Coulomb blockade effect in the CdSe tetrapod were clearly observed in the pump-fluence-dependent transient absorption spectra. Hot electrons were transferred from arm states into the electron acceptor molecules before relaxation into core states.
収録刊行物
-
- ACS Applied Materials & Interfaces
-
ACS Applied Materials & Interfaces 7 (15), 7938-7944, 2015-04-13
American Chemical Society (ACS)