Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO
Author | N., Sesha Bamini |
Author | Němec, Hynek |
Author | Žídek, Karel |
Author | Abdellah, Mohamed |
Author | Al-Marri, Mohammed J. |
Author | Chábera, Pavel |
Author | Ponseca, Carlito |
Author | Zheng, Kaibo |
Author | Pullerits, Tönu |
Available date | 2023-02-02T04:34:11Z |
Publication Date | 2017 |
Publication Name | Physical Chemistry Chemical Physics |
Resource | Scopus |
Abstract | Photoinitiated charge carrier dynamics in ZnO nanoparticles sensitized by CdSe quantum dots is studied using transient absorption spectroscopy and time-resolved terahertz spectroscopy. The evolution of the transient spectra shows that electron injection occurs in a two-step process, where the formation of a charge transfer state (occurring in several picoseconds) is followed by its dissociation within tens of picoseconds. The photoconductivity of electrons injected into the ZnO nanoparticles is lower than that of charges photogenerated directly in ZnO. We conclude that the motion of injected electrons in ZnO nanoparticles is strongly influenced by their interaction with positive charges left in the sensitizing quantum dots. the Owner Societies 2017. |
Sponsor | This work was supported by the Knut and Alice Wallenberg Foundation, Swedish Research Council, Czech Science Foundation (Grant 17-03662S) and Carl Tryggers Foundation in Stockholm (Project CTS 14:390). KZ acknowledges support from NPRP grant #NPRP7-227-1-034 from the Qatar National Research Fund (a member of Qatar Foundation). |
Language | en |
Publisher | Royal Society of Chemistry |
Subject | nanoparticles transient absorption spectroscopy terahertz spectroscopy ZnO |
Type | Article |
Pagination | 6006-6012 |
Issue Number | 8 |
Volume Number | 19 |
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