Abstract
Capping or functionalization of semiconductor quantum dots (QDs) is unavoidable for their photostability in practical use including sensitizer and biological tagging agents. However, the efficiency of the electron/hole transport from the photoexcited QDs to the external environments across the capping shell is not well-understood. In this study we report on the femtosecond carrier dynamics of core−shell type CdSe−ZnS semiconductor QDs of various sizes. Steady-state spectroscopic studies followed by picosecond-resolved time correlated single photon counting (TCSPC) experiments on the complexation of the QDs with a well-known electron acceptor, benzoquinone (BQ), reveal that the complex is essentially static in nature. Femtosecond-resolved fluorescence upconversion experiments on the complex explore the dynamics of electron transport from core CdSe to BQ via ZnS shell. The dependence of the electron transport dynamics on the core size of the QDs has also been explored. We have also studied the dynamics of e...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
