Time-of-flight photoconductivity investigation of high charge carrier mobility in Ti3C2Tx MXenes thin-film

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Jurij Urbančič - , University of Nova Gorica (Autor:in)
  • Erika Tomsič - , University of Nova Gorica (Autor:in)
  • Manisha Chhikara - , University of Nova Gorica (Autor:in)
  • Nadiia Pastukhova - , University of Nova Gorica (Autor:in)
  • Vadym Tkachuk - , University of Nova Gorica (Autor:in)
  • Alexander Dixon - , University of Nova Gorica (Autor:in)
  • Andraž Mavrič - , University of Nova Gorica (Autor:in)
  • Payam Hashemi - , Professur für Molekulare Funktionsmaterialien (cfaed), Max Planck Institute of Microstructure Physics (Autor:in)
  • Davood Sabaghi - , Professur für Molekulare Funktionsmaterialien (cfaed) (Autor:in)
  • Ali Shaygan Nia - , Professur für Molekulare Funktionsmaterialien (cfaed), Max Planck Institute of Microstructure Physics (Autor:in)
  • Gvido Bratina - , University of Nova Gorica (Autor:in)
  • Egon Pavlica - , University of Nova Gorica (Autor:in)

Abstract

Charge transport through a randomly oriented multilayered network of two-dimensional (2D) Ti3C2Tx (where Tx is the surface termination and corresponds to O, OH and F) was studied using time-of-flight photoconductivity (TOFP) method, which is highly sensitive to the distribution of charge carrier velocities. We prepared samples comprising Ti3C2Tx with thickness of 12 nm or 6-monolayers. MXene flakes of size up to 16 μm were randomly deposited on the surface by spin-coating from water solution. Using TOFP, we have measured electron mobility that reached values up to 279 cm2/Vs and increase with electric-field in a Poole-Frenkel manner. These values are approximately 50 times higher than previously reported field-effect mobility. Interestingly, our zero-electric-field extrapolate approaches electron mobility measured using terahertz absorption method, which represents intra-flake transport. Our data suggest that macroscopic charge transport is governed by two distinct mechanisms. The high mobility values are characteristic for the intra-flake charge transport via the manifold of delocalized states. On the other hand, the observed Poole-Frenkel dependence of charge carrier mobility on the electric field is typical for the disordered materials and suggest the existence of an important contribution of inter-flake hopping to the overall charge transport.

Details

OriginalspracheEnglisch
Aufsatznummer109879
Seitenumfang6
FachzeitschriftDiamond and related materials
Jahrgang135
PublikationsstatusVeröffentlicht - Mai 2023
Peer-Review-StatusJa

Externe IDs

WOS 000969897300001

Schlagworte

Forschungsprofillinien der TU Dresden

Schlagwörter

  • Charge transport in multilayered network of flakes, High-mobility solution-cast thin-film, MXene exfoliation, Semiconducting mxene, Time-of-flight photoconductivity, Charge transport in multilayered network of, Flakes