Colloquium - Dr. Chris Collison

Please join us this Friday (11/17) for a talk by Dr. Chris Collison  from the Rochester Institute of Technology!

Dr. Collison will be talking about the "Impact of molecular structure on crystallization, nanomorphology and excited state properties of squaraines for bulk heterojunction solar cells" (see abstract below), and all are welcome. The event takes place in GWH 150. Refreshments will be served at 3:30, and the talk will begin at 4 p.m. 

"The efficiency of small molecule organic photovoltaic (OPV) devices is driven higher with a strong understanding of materials properties and how they are linked to device mechanism, and a subsequent prescriptive approach to molecular design. The Collison group works with squaraines, which are simple quadrupoles for which computational modeling, spectroscopic simulation, full characterization and device optimization can all be connected. I will present absorption, X-ray diffraction, DSC, TGA, AFM and TEM data for a series of aniline based squaraines with varying molecular side-chain.

I will correlate these data to their performance in bulk heterojunction OPV devices. Although these squaraine molecules exhibit similar absorbance spectra and crystal structure, a profound difference in properties that drive the OPV performance becomes apparent when blending each squaraine with fullerenes (PCBM) needed for device operation. Longer side chains actually drive more extensive phase separation in the blends, which has a significant effect on device efficiency. I will also present our most recent Essential States Model results to connect with characterization, mobility and device data. The essential states model relies on a very simple point charge description of the squaraines but can lead to molecular design strategies to influence the more effective use of organic electronic materials beyond the squaraine family."

Dates and Times

Date and Time Admission Location Map Link
Fri, 11/17/2017 - 3:30pm - 5:00pm Admission is free Garwood Hall 150 n/a

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Mail Address:
Department of Physics and Astronomy
ASU Box 32106
Boone, NC 28608-2106 

Physical Address (also for shipping):
GWH 231
525 Rivers Street
Boone, NC, 28608-2106

Telephone: 828-262-3090
Fax: 828-262-2049

Social Media:
Twitter: @asuphyast

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