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

Lin, Ming-Fu

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Description

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

Language

eng

Handle URL

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

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