Collaboration in Energy Transfer

Our lab recently supported a novel experiment that studied the hole (h+) transport between CdSe/ZnS quantum dots and conductive polymers.  That experiment, let by Dr. Mircea Cotlet at Brookhaven National Laboratory, used CdSe qdots with a particle emission wavelength with a tailored ZnS shell thicknesses fabricated by our graduate student Corey Hine.  In this case, the synthesis conditions were tuned to have a red-emitting dot (635 nm), with ZnS shell thickness of ~1.2, 1.7, 2.2, and 4.2 nm.  While synthesized under air-free conditions, the qdots surface chemistry was manipulated to be short, and hydrophilic.  As recently reported in ACS Nano, the work studied h+ transfer at the ensemble and single molecule level, and discovered that a ZnS shell thickness of ~2-nm is optimum to balance h+ transport kinetics, as well as qdot stability.  This work is important is many future thin-film photovoltaics may incorporate qdots as the sensitizer, and conductive polymers as both the e- and h+ transport properties.  We are currently fabricating a number of other specifically crafted qdots for Cotlet and his co-workers for future studies.