Related Experiment Video
Updated: May 16, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
Ultrafast dynamics of multiple exciton harvesting in the CdSe-ZnO system: electron injection versus Auger
Karel Zídek1, Kaibo Zheng, Mohamed Abdellah
1Department of Chemical Physics, Lund University, Box 124, 22100 Lund, Sweden. Karel.Zidek@chemphys.lu.se
Abstract:
We study multiple electron transfer from a CdSe quantum dot (QD) to ZnO, which is a prerequisite for successful utilization of multiple exciton generation for photovoltaics. By using ultrafast time-resolved spectroscopy we observe competition between electron injection into ZnO and quenching of multiexcitons via Auger recombination. We show that fast electron injection dominates over biexcitonic Auger recombination and multiple electrons can be transferred into ZnO. A kinetic component with time constant of a few tens of picoseconds was identified as the competition between injection of the second electron from a doubly excited QD and a trion Auger recombination. Moreover, we demonstrate that the multiexciton harvesting efficiency changes significantly with QD size. Within a narrow QD diameter range from 2 to 4 nm, the efficiency of electron injection from a doubly excited QD can vary from 30% to 70% in our system.
More Related Videos
09:22Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications
Published on: July 25, 2025
11:30Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
Published on: March 6, 2017
Related Concept Videos
Carrier Generation and Recombination
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
The Z-Scheme of Electron Transport in Photosynthesis
Thermal and Photochemical Electrocyclic Reactions: Overview
Nuclear Overhauser Enhancement (NOE)
π Electron Effects on Chemical Shift: Overview