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Title:HIGH RESOLUTION ANION PHOTOELECTRON SPECTROSCOPY OF OLIGOTHIOPHENE LOW-LYING EXCITED STATES
Author(s):Sagan, Cole R
Contributor(s):Garand, Etienne ; Thurston, Glen K
Subject(s):Vibrational structure/frequencies
Abstract:Thiophenes are one of the most promising polymeric solar cells, as in the last decade, the efficiency of thiophene-based polymer cells has increased from 1\% to 11.5\%.\footnote{Mehmood, U., et al. (2016). "Review on recent advances in polythiophene based photovoltaic devices." Renewable and Sustainable Energy Reviews 57: 550-561. } Their use is limited by several factors, including a lack of understanding about their charge-transport properties in solar cells. To this end, we used cryogenic slow electron velocity map-imaging (SEVI) to acquire vibrationally-resolved anion photoelectron spectra of a family of thiophenes, increasing in chain length, culminating with a 5-mer thiophene chain (quinquethiophene). These spectra yield electron-affinities, T$_{1}$ energies, and active vibrations in transitions from the anion to the neutral S$_{0}$ and T$_{1}$ states. Comparing experimental spectra with electronic structure calculations gives information about the delocalization of electrons on increasing length thiophene chains. This will build a model for the accommodation of electrons in polymers of thiophenes.
Issue Date:2019-06-17
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/104283
DOI:10.15278/isms.2019.ML05
Rights Information:Copyright 2019 Cole R Sagan
Date Available in IDEALS:2019-07-15
2020-01-25


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