KIP publications

year 2020
author(s) Michael Tzschoppe, Christian Huck, Andrey Butkevich, Benjamin GŁnther, Constantin Ulrich, Jan Niklas Rose, Lutz H. Gade, Annemarie Pucci
title Interface properties and dopability of an organic semiconductor: TAPP-Br variable as molecule but inert in the condensed phase
KIP-Nummer HD-KIP 20-52
KIP-Gruppe(n) F6
document type Paper
source J. Mater. Chem. C 2020
doi 10.1039/D0TC01555E
Abstract (en)

In-situ infrared spectroscopy under ultra-high vacuum conditions reveals the behaviour of an example molecule, the n-conducting organic semiconductor (2,9–Bis-(heptafluoropropyl)-4,7,11,14–tetrabromo-1,3,8,10–tetraazaperopyrene, TAPP-Br), upon condensation on various surfaces and as mixture with typical dopants. The bending of molecules on Au(111) as previously established by inelastic electron scattering is seen also in infrared spectra of molecules on gold films, but clearly depends on temperature. It is indicated by modified infrared signals from C3F7 sidechain vibrations. If deposited onto MoO3, a commonly used p-dopant and interlayer material in organic electronics, infrared vibrational spectra are similarly modified while MoO3 deposition onto a preformed condensed layer did not produce any molecular change. Calcium, often used as n-dopant, leads to further changes of the TAPP-Br vibrations in co-evaporated layers which are the modified C-C vibrations on the aromatic rings indicating charge transfer. Upon deposition of TAPP-Br on Ca films, a strong decrease of the metallic absorption of the Ca layer has been observed, which is typical for a chemical interface interaction. In contrast, for Ca deposition onto an already condensed TAPP-Br layer, a pronounced Ca island growth and thus enhanced diffusion and no significant vibrational changes are observed. So, chemical doping should be done before the molecules crystallize and physisorption as well as chemisorption at interfaces strongly depend on the deposition sequence, which should be considered also for other organic semiconductors.

  author   = {Tzschoppe, Michael and Huck, Christian and Butkevich, Andrey and G\"unther, Benjamin and Ulrich, Constantin and Rose, Jan Niklas and Gade, Lutz H. and Pucci, Annemarie},
  title    = {Interface properties and dopability of an organic semiconductor: TAPP-Br variable as molecule but inert in the condensed phase},
  journal  = {J. Mater. Chem. C},
  year     = {"2020"},
  volume   = {},
  pages    = {"-"},
  doi      = {10.1039/D0TC01555E},
  url      = {}
URL D0TC01555E
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