Subpicosecond Photoinduced Hole Transfer from a CdS Quantum Dot to a Molecular Acceptor Bound Through an Exciton-Delocalizing Ligand

Shichen Lian, David J. Weinberg, Rachel D. Harris, Mohamad S. Kodaimati, Emily A Weiss

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

This paper describes the enhancement of the rate of hole transfer from a photoexcited CdS quantum dot (QD), with radius R = 2.0 nm, to a molecular acceptor, phenothiazine (PTZ), by linking the donor and acceptor through a phenyldithiocarbamate (PTC) linker, which is known to lower the confinement energy of the excitonic hole. Upon adsorption of PTC, the bandgap of the QD decreases due to delocalization of the exciton, primarily the excitonic hole, into interfacial states of mixed QD/PTC character. This delocalization enables hole transfer from the QD to PTZ in 1H NMR. This work provides direct spectroscopic evidence of the enhancement of the rate of hole extraction from a colloidal QD through covalent linkage of a hole acceptor through an exciton-delocalizing ligand.

Original languageEnglish
Pages (from-to)6372-6382
Number of pages11
JournalACS Nano
Volume10
Issue number6
DOIs
Publication statusPublished - Jun 28 2016

Fingerprint

Excitons
Semiconductor quantum dots
Ligands
quantum dots
excitons
ligands
phenothiazines
augmentation
Energy gap
linkages
Nuclear magnetic resonance
LDS 751
Adsorption
nuclear magnetic resonance
adsorption
radii
phenothiazine
energy

Keywords

  • CdS quantum dot
  • dithiocarbamate
  • electronic coupling
  • exciton delocalization
  • hole transfer
  • transient absorption spectroscopy

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Subpicosecond Photoinduced Hole Transfer from a CdS Quantum Dot to a Molecular Acceptor Bound Through an Exciton-Delocalizing Ligand. / Lian, Shichen; Weinberg, David J.; Harris, Rachel D.; Kodaimati, Mohamad S.; Weiss, Emily A.

In: ACS Nano, Vol. 10, No. 6, 28.06.2016, p. 6372-6382.

Research output: Contribution to journalArticle

Lian, Shichen ; Weinberg, David J. ; Harris, Rachel D. ; Kodaimati, Mohamad S. ; Weiss, Emily A. / Subpicosecond Photoinduced Hole Transfer from a CdS Quantum Dot to a Molecular Acceptor Bound Through an Exciton-Delocalizing Ligand. In: ACS Nano. 2016 ; Vol. 10, No. 6. pp. 6372-6382.
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