Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

Growth and evolution of tetracyanoquinodimethane and potassium coadsorption phases on Ag(111)

Tools
- Tools
+ Tools

Haags, Anja, Rochford, Luke A., Felter, Janina, Blowey, Phil J., Duncan, David A., Woodruff, D. P. and Kumpf, Christian (2020) Growth and evolution of tetracyanoquinodimethane and potassium coadsorption phases on Ag(111). New Journal of Physics, 22 (6). 063028. doi:10.1088/1367-2630/ab825f

[img]
Preview
PDF
WRAP-Growth-evolution-tetracyanoquinodimethane-Woodruff-2020.pdf - Published Version - Requires a PDF viewer.
Available under License Creative Commons Attribution 4.0.

Download (2799Kb) | Preview
Official URL: http://dx.doi.org/10.1088/1367-2630/ab825f

Request Changes to record.

Abstract

Alkali-doping is a very efficient way of tuning the electronic properties of active molecular layers in (opto-) electronic devices based on organic semiconductors. In this context, we report on the phase formation and evolution of charge transfer salts formed by 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) in coadsorption with potassium on a Ag(111) surface. Based on an in-situ study using low energy electron microscopy and diffraction we identify the structural properties of four phases with different stoichiometries, and follow their growth and inter-phase transitions. We label these four phases α to δ, with increasing K content, the last two of which (γ and δ-phases) have not been previously reported. During TCNQ deposition on a K-precovered Ag(111) surface we find a superior stability of δ-phase islands compared to the γ-phase; continued TCNQ deposition leads to a direct transition from the δ to the β-phase when the K : TCNQ ratio corresponding to this phase regime is reached, with no intermediate γ-phase formation. When, instead, K is deposited on a surface precovered with large islands of the low density commensurate (LDC) TCNQ phase that are surrounded by a TCNQ 2D-gas, we observe two different scenarios: on the one hand, in the 2D-gas phase regions, very small α-phase islands are formed (close to the resolution limit of the microscope, 10–15 nm), which transform to β-phase islands of similar size with increasing K deposition. On the other hand, the large (micrometer-sized) TCNQ islands transform directly to similarly large single-domain β-phase islands, the formation of the intermediate α-phase being suppressed. This frustration of the LDC-to-α transition can be lifted by performing the experiment at elevated temperature. In this sense, the morphology of the pure TCNQ submonolayer is conserved during phase transitions.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Alkali metals, Chemistry, Inorganic, Electronic materials, Organic semiconductors -- Electric properties, Adsorption, Potassium
Journal or Publication Title: New Journal of Physics
ISSN: 1367-2630
Official Date: 19 June 2020
Dates:
DateEvent
19 June 2020Published
23 March 2020Available
23 March 2020Accepted
Date of first compliant deposit: 28 October 2020
Volume: 22
Number: 6
Article Number: 063028
DOI: 10.1088/1367-2630/ab825f
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Copyright Holders: © 2020 The Author(s).
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDDiamond Light Sourcehttp://dx.doi.org/10.13039/100011889
UNSPECIFIED[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
1083[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us