## Files in this item

FilesDescriptionFormat

application/vnd.openxmlformats-officedocument.presentationml.presentation

1404876.pptx (6MB)
PresentationMicrosoft PowerPoint 2007

application/pdf

3828.pdf (15kB)
AbstractPDF

## Description

 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: 2019-07-152020-01-25
﻿