Characterization of photoinduced electron tunneling in gold/SAM/Q-CdSe systems by time-resolved photoelectrochemistry

E.P.A.M. Bakkers, A.L. Roest, A.W. Marsman, L.W. Jenneskens, L.L. Jong-van.Steensel, De, J.J. Kelly, D. Vanmaekelbergh

Research output: Contribution to journalArticleAcademicpeer-review

71 Citations (Scopus)

Abstract

Colloidal CdSe quantum dots were chemisorbed on a gold electrode using a variety of self-assembled monolayers (SAMs) consisting of dithiols and rigid disulfides. After absorption of a photon with an energy larger than the band gap, a long-lived excited state is formed in the quantum dot; this state can decay by electron tunneling via the gold. The rate of photoinduced tunneling was measured directly by intensitymodulated photocurrent spectroscopy (IMPS), and its distance dependence was studied using rigid SAMs separating the Q-CdSe and Au. The tunneling rate was found to depend exponentially on the distance, with a decay length of 2 Å.
Original languageEnglish
Pages (from-to)7266-7272
JournalJournal of Physical Chemistry B
Volume104
Issue number31
DOIs
Publication statusPublished - 2000

Fingerprint Dive into the research topics of 'Characterization of photoinduced electron tunneling in gold/SAM/Q-CdSe systems by time-resolved photoelectrochemistry'. Together they form a unique fingerprint.

Cite this