Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session T71: Electronic Processes and Interfaces in Organic Semiconductors
11:30 AM–2:30 PM,
Thursday, March 17, 2022
Room: Hyatt Regency Hotel -Jackson Park C
Sponsoring
Units:
DMP DCMP
Chair: Suchismita Guha, University of Missouri
Abstract: T71.00011 : Reversibly switching the work function of tetrachloropyrazine on Pt(111)
2:18 PM–2:30 PM
Presenter:
Lukas Hörmann
(Graz University of Technology)
Authors:
Lukas Hörmann
(Graz University of Technology)
Andreas Jeindl
(Graz Univ of Technology)
Oliver T Hofmann
(Graz University of Technology)
We realize such a switchable interface with tetrachloropyrazine (TCP) on Pt(111). TCP can either chemisorb or physisorb on the Pt(111) surface, forming a double-well potential. The two minima exhibit different adsorption geometries. These allow forming diverse interface structures with notably different work function changes and coherent fractions (obtained by X-ray standing wave measurements) which can be reversibly switched.
To model this switchable interface, we apply an extended version of the SAMPLE approach which facilitates structure search for commensurate as well as higher-order commensurate adlayers. This yields three different classes of interface structures with varying work function changes and coherent fractions. We demonstrate that external stimuli, such as temperature and pressure, enable reversible switching between these different classes in order to create a dynamic interface for applications in organic electronics.
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