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<!--StartFragment--><p class="MsoNormal" style="text-align: justify; "><font size="4">This
talk describes the mechanisms by which organic surfactants – in particular
phenyldithiocarbamate (PTC) and its derivatives – couple electronically to the
delocalized states of semiconductor quantum dots (QDs). This coupling reduces
the confinement energies of excitonic carriers, and, in the case of PTC, the
optical bandgap of metal chalcogenide QDs by up to 1 eV by selectively
delocalizing the excitonic hole. The reduction of confinement energy for the
hole is enabled by the creation of interfacial electronic states near the
valence band edge of the QD. The PTC case illuminates the general minimal
requirements for surfactants to achieve observable bathochromic or hypsochromic
shifts of the optical bandgap of QDs: frontier orbitals with energies near the
relevant semiconductor band-edge, the correct symmetry to mix with the orbitals
of the relevant band, and an adsorption geometry that permits spatial overlap
between the orbitals of the ligand and those of the relevant band. NMR
measurements indicate that the magnitude of exciton delocalization, as measured
by the effective increase in excitonic radius, <span style="font-family: Symbol; ">D</span>R, increases linearly with surface coverage of PTC and
substituted PTCs. Transient absorption measurements on complexes of QDs and
zinc-porphyrins show that <i>bis</i>-PTC
molecules are effective cross-linking ligands for enhancing yields of electron
transfer within donor-acceptor complexes.</font></p><p class="MsoNormal" style="text-align: justify; "><span style="font-size: large; text-align: center; "> </span></p><p class="MsoNormal" align="center"><font size="4">Grier Room, MIT Bldg 34-401<o:p></o:p></font></p><p class="MsoNormal" align="center"><font size="4">Refreshments served after
the lecture</font><font size="6"><o:p></o:p></font></p>
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