Spectroelectrochemistry of Colloidal CdSe Quantum Dots
Arun Ashokan, Paul Mulvaney
CHEMISTRY OF MATERIALS | AMER CHEMICAL SOC | Published : 2021
Solution-phase spectroelectrochemistry was used to study electron injection into colloidal CdSe quantum dots (QDs) with sizes ranging from 3.4 to 11.1 nm in tetrahydrofuran (THF). The absorbance and photoluminescence of the QDs were monitored in response to both charging and discharging cycles, and the optical changes were reversible on a timescale of minutes. Bleaching of the QD 1S3/2h1Se exciton state was used to determine the conduction band energy levels. We found that the negative trion state was stable in THF for hours under an applied cathodic potential. Both the degree of bleaching and the recovery of the exciton state depended on the applied potential. Based on the current and charg..View full abstract
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Awarded by ARC
The authors thank the ARC for support through CE170100026. A.A. thanks the University of Melbourne for a Melbourne Research Scholarship.