Excitonics people! This talk seems very relevant.
Alán Aspuru-Guzik | Professor of Chemistry and Chemical Biology
Harvard University | 12 Oxford Street, Room M113 | Cambridge, MA 02138
(617)-384-8188 |
http://aspuru.chem.harvard.edu |
http://about.me/aspuru
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Subject: Re: Special Seminar TODAY - Oleg Koslov- 2PM- 66-144
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From: Leonid Levitov <levitov(a)exchange.mit.edu>
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Date: Wed, 27 Jul 2016 09:36:53 -0400
Subject: Re: Special Seminar TODAY - Oleg Koslov- 2PM- 66-144
i will advertise it in our group but i am afraid most of people are away
myself included
On 07/27/2016 09:17 AM, Catherine M Bourgeois wrote:
*TODAY*
*Please post and forward to your groups*
*----------------*
*The William Tisdale Group Presents: *
*Oleg V. Koslov, University of Groningen, The Netherlands*
*“Watching molecular excitons move”*
*Wednesday, July 27, 2016*
*Room 66-144, 2:00 – 3:00pm*
Oleg V. Kozlov1, Foppe de Haan1, Ross A. Kerner,2 Barry P. Rand2, David
Cheyns3 and Maxim S. Pshenichnikov1
1 Zernike Institute for Advanced Materials, University of Groningen, The
Netherlands
2 Department of Electrical Engineering and Andlinger Center for Energy and
the Environment, Princeton University, Princeton, NJ, USA
3 imec, Leuven, Belgium
*o.kozlov(a)rug.nl <o.kozlov(a)rug.nl>*
Organic electronic devices are based on organic semiconductors, which
combine attractive properties of organic materials with semiconducting
behavior. The elementary excitation in these materials is a so-called
“Frenkel exciton” – a strongly bound pair of negative (electron) and
positive (hole) charges. As a result, organic electronics essentially rely
on exciton diffusive dynamics that have to be controlled and observed to
ensure the development of high-efficient organic devices.
Here we watch the exciton diffusion process in real time with a new
technique based on ultrafast photoinduced absorption spectroscopy with ~100
fs time resolution. Using vacuum-deposited C70 layers as a model system, we
demonstrate an extremely high diffusion coefficient of *D* ≈ 3.5·10‑3 cm2/s
that originates from surprisingly low energetic disorder of <5 meV. The
experimental results are well-described by the analytical model and
supported by extensive Monte-Carlo simulations. The proposed technique is
deemed as a powerful tool for further development of organic
opto-electronic components, such as simple layered solar cells,
light-emitting diodes, and electrically pumped lasers.
*Oleg V. (Viktorovich) Kozlov *received his Masters in Physics degree from
Moscow State University, Faculty of Physics, in 2013. In 2009, he joined
the research group of Professor Dmitry Paraschuk at Moscow State
University, where he worked on device physics of organic solar cells and
light emitting diodes. In 2012, he started a collaboration with Dr. Maxim
Pshenichnikov (Zernike Institute for Advanced Materials, University of
Groningen, the Netherlands) on ultrafast spectroscopy of novel organic
molecules. In 2013, he moved to the same group as a PhD candidate, where he
studies ultrafast charge and exciton dynamics (charge generation and
recombination, exciton diffusion, singlet-to-triplet conversion, etc) in
organic solids.
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