University of Illinois Urbana-Champaign

ULTRAFAST ENERGY TRANSFER AND STRUCTURAL DYNAMICS OF THE ORGANIC POLYMER ON AN MoS₂ MONOLAYER

Lin, Ming-Fu

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6740.pdf
MH06_1.pptx

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https://hdl.handle.net/2142/122438

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Title
ULTRAFAST ENERGY TRANSFER AND STRUCTURAL DYNAMICS OF THE ORGANIC POLYMER ON AN MoS₂ MONOLAYER
Author(s)
Lin, Ming-Fu
Contributor(s)
  • Bergmann, Uwe
  • Vashishta, Priya
  • Wang, Xijie
  • Pulickel, Ajayan
  • Shen, Xiaozhe
  • Zhang, Xiang
  • Britz, Alexander
  • Krishnamoorthy, Aravind
  • Chang, Hung-Tzu
  • Attar, Andrew
Issue Date
2023-06-19
Keyword(s)
Mini-symposium: Spectroscopy at Large-scale Facilities
Abstract
Energy transfer across a heterogeneous interface is an important topic to understand detailed functioning mechanisms of solar cells. Here, we used mega-electronvolt ultrafast electron diffraction (MeV UED) as a sensitive time-resolved "thermometer" to simultaneously measure structural dynamics and energy transfer between a polymer (PTB7) and an atomic thin MoS₂ monolayer. Optical excitation of the polymer at 700 nm induces a short-lived temperature jump that relaxes quickly through the heterojunction interface to the monolayer MoS₂. The thermal energy transfers from the polymer to the atomic layer is described by the thermal transport model. The time-resolved structural dynamics of polymer suggests a bond dissociation located specifically at the C-O sidechain during the flattening motion of the two aromatic conjugated rings in the excited state, providing the fundamental mechanism of the photo-instability of a polymer in the applications of solar cell materials.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/122438
DOI
https://doi.org/10.15278/isms.2023.6740

Owning Collections

Abstracts & Presentations - 2023 International Symposium on Molecular Spectroscopy PRIMARY