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<!--StartFragment--><p class="MsoTitle" style="margin-right:-.5in"><b style="mso-bidi-font-weight:
normal"><span style="font-family:"Times New Roman""><font class="Apple-style-span" size="4"><span class="Apple-tab-span" style="white-space:pre"> </span>Seminar on<o:p></o:p></font></span></b></p><p class="MsoTitle" style="margin-right:-.5in"><b style="mso-bidi-font-weight:
normal"><span style="font-family: 'Times New Roman'; "><o:p><font class="Apple-style-span" size="4"> <span class="Apple-tab-span" style="white-space:pre"> </span></font></o:p></span></b><span class="Apple-style-span" style="font-size: large; "><b style="mso-bidi-font-weight:
normal"><span style="letter-spacing: 1.5pt; ">Modern Optics and Spectroscopy</span></b></span></p><p class="MsoTitle" style="margin-right:-.5in"><b style="mso-bidi-font-weight:
normal"><span style="font-family: Arial; letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><font class="Apple-style-span" size="4">Using
time-resolved THz spectroscopy to study<o:p></o:p></font></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><font class="Apple-style-span" size="4">carrier
injection and dynamics in TiO<sub>2</sub> and SnO<sub>2 </sub>nanomaterials<o:p></o:p></font></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span style="letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4"><b style="mso-bidi-font-weight:
normal">Charles
Schmuttenmaer</b><span style="letter-spacing: 1pt; ">,<o:p></o:p></span></font></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">Yale
University<o:p></o:p></font></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">Tuesday,
November 1, 2011<o:p></o:p></font></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">12:00 –
1:00 p.m.<o:p></o:p></font></span></p><p class="MsoNormal" align="center" style="text-align:center"><span class="Apple-style-span" style="line-height: 20px; font-size: large; ">Charge injection from a variety of porphyrin-based
dyes bound to TiO<sub>2</sub> and SnO<sub>2</sub> has been measured.<span style="mso-spacerun:yes"> </span>The time scales and efficiencies are
interpreted in terms of the identities (singlet vs. triplet) and energetics of
excited electronic states.<span style="mso-spacerun:yes"> </span>In addition, we
have characterized the time-dependent conductivity after photoexcitation of
dye-sensitized TiO<sub>2</sub> nanotubes.<span style="mso-spacerun:yes">
</span>It had been hoped that nanotubes would overcome low electron mobilities
found in TiO<sub>2</sub> nanoparticle films because the nanotubes can be many
tens of microns long.<span style="mso-spacerun:yes"> </span>However, recent
macroscopic measurements found electron transport through nanotube and
nanoparticle films to be comparable.<span style="mso-spacerun:yes">
</span>Here we show that low electron mobility in polycrystalline TiO<sub>2</sub>
nanotubes is not due to scattering from grain boundaries but instead due to
traps that manifest themselves in a single sharp resonance in the THz
spectrum.<span style="mso-spacerun:yes"> </span>The TiO<sub>2</sub> nanotube
spectra are fundamentally and qualitatively different than that for
nanoparticles or the bulk material.</span></p><p class="MsoNoSpacing"><span style="font-family: 'Times New Roman'; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4">Grier Room, MIT Bldg 34-401<o:p></o:p></font></p><p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4">Refreshments served after
the lecture</font><font class="Apple-style-span" size="6"><o:p></o:p></font></p>
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