F-V/SMS: A new technique for studying the structure and dynamics of single molecules and nanoparticles

Andre J. Gesquiere, So Jung Park, Paul F. Barbara

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


We recently introduced a new technique for semiconductor nanoparticle research that involves simultaneous single molecule spectroscopy (SMS) and controllable oxidation/reduction in an electronic device. This paper shows that the new technique, denoted by fluorescence-voltage single molecule spectroscopy (F-V/SMS), is analogous to current vs voltage (I- V) measurements for devices and electrochemical cells. F-V/SMS data are reported for single molecules (nanoparticles) of the conjugated polymer MEH-PPV as a function of bias voltage on the device and bias sweep rate to obtain information on both the energetics and kinetics of the charge transfer (oxidation/reduction) process in situ on the nanoscale. The extensive F-V/SMS data presented herein reveal that the dynamics for oxidation/reduction of MEH-PPV nanoparticles are controlled by various factors including filling of deep hole traps in the charge transporting layer of the device, the oxidation/ reduction chemical "state" of the MEH-PPV molecule, and the molecular scale heterogeneity of the device.

Original languageEnglish
Pages (from-to)10301-10308
Number of pages8
JournalJournal of Physical Chemistry B
Issue number29
StatePublished - 22 Jul 2004


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