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@ARTICLE{Haags:874669,
      author       = {Haags, Anja and Rochford, Luke A. and Felter, Janina and
                      Blowey, Phil J. and Duncan, David Andrew and Woodruff, D
                      Phil and Kumpf, Christian},
      title        = {{G}rowth and {E}volution of {TCNQ} and {K} {C}oadsorption
                      {P}hases on {A}g(111)},
      journal      = {New journal of physics},
      volume       = {22},
      issn         = {1367-2630},
      address      = {[London]},
      publisher    = {IOP},
      reportid     = {FZJ-2020-01585},
      pages        = {063028},
      year         = {2020},
      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 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.},
      cin          = {PGI-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-3-20110106},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000545698900001},
      doi          = {10.1088/1367-2630/ab825f},
      url          = {https://juser.fz-juelich.de/record/874669},
}