Tuning Photoinduced Charge Transfer in Quantum Dot-Based Hybrids via Self-Assembly

Wednesday, December 5, 2012 2:30 pm

Contact: 
Frances Flanigan - fflaniga@stevens.edu

Dr. Mircea Cotlet
Brookhaven National Laboratory
Upton, New York

ABSTRACT

Hybrid nanomaterials combine organic, inorganic, metal or biological components onto a given nanostructure to achieve specific properties, combination of specific properties or new properties that may not exist in separated components. Hybrid nanomaterials have seen widespread utilization in various fields, including optoelectronic, batteries, biosensing and nanomedicine. The ability to tune the interaction between the components in a hybrid allows one to enhance relevant properties of a hybrid towards its utilization in a particular desired application. Our group uses self-assembly methods to develop quantum dot-based hybrids with tunable photovoltaic relevant properties such as charge and energy transfer and studies these hybrids with time-resolved single molecule spectroscopy. I will discuss two examples on how selfassembly can be used to control charge transfer between quantum dots and acceptor materials like conductive polymers [1] and fullerenes [2] to achieve improved properties for photovoltaic applications.

[1]. Z.Xu, C.R.Hine, M.Maye and M.Cotlet Shell Thickness Dependent Photoinduced Hole Transfer in Hybrid Conjugated Polymer/Quantum Dot Nanocomposites: From Ensemble to Single Hybrid Level. Acs Nano 2012, 6, 4984-4992.
[2]. Z.Xu and M.Cotlet, Control of Photoinduced Quantum dot-bridgefullerene heterodimers with controlled charge transfer properties, Angewandte Chemie Intl. Ed., 2011, 50(27) 6079.

BIOGRAPHY

Mircea Cotlet is a Materials Scientist in the Center for Functional Nanomaterials at Brookhaven National Laboratory in Long Island, NY where he leads the single molecule spectroscopy facility, a science user research effort sponsored by the Office of Science of US Department of Energy. His group research is focused on the self-assembly and single molecule spectroscopic characterization of hybrid nanomaterials for renewable energy and biosensing. More details on research group activities and accomplishments can be be found at http://www.bnl.gov/sms.