Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session B56: Focus Topic: Surface, Interface, and Thin Film Science of Organic Molecular Solids I
11:30 AM–2:18 PM,
Monday, March 15, 2021
Sponsoring
Unit:
DMP
Chair: Emily Bittle, National Institute of Standards and Technology
Abstract: B56.00011 : Probing the Interfacial Electronic Density of States of Perylenediimide Thin Films using Electronic Sum-Frequency Generation*
1:54 PM–2:06 PM
Live
Presenter:
Daniel Cotton
(University of Texas at Austin)
Authors:
Daniel Cotton
(University of Texas at Austin)
Aaron Moon
(Tower Jazz)
Jon A Bender
(University of Texas at Austin)
Sean T Roberts
(University of Texas at Austin)
Along with bulk structural and spectroscopic analyses, we probed the interfacial density of states of PDI films using electronic sum frequency generation (ESFG). Our ESFG spectra show a narrowed bandgap (~80 meV) at interfaces formed between PDI solids and oxide substrates, which is qualitatively reproduced by subtle changes in PDI intermolecular structure at the interface induced by strain. These findings also suggest there is an energy gradient that could move excitons towards PDI-substrate interfaces, which could enable several singlet fission-based electronics.
*Welch
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