HIGH RESOLUTION ANION PHOTOELECTRON SPECTROSCOPY OF OLIGOTHIOPHENE LOW-LYING EXCITED STATES

Sagan, Cole R

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https://hdl.handle.net/2142/104283 Copy

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

Issue Date

2019-06-17

Keyword(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."

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/104283

DOI

10.15278/isms.2019.ML05

Copyright and License Information

Copyright 2019 Cole R Sagan

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