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Title:Time-of-flight photoconductivity investigation of high charge carrier mobility in ▫$Ti_3C_2T_x$▫ MXenes thin-film
Authors:ID Urbančič, Jurij (Author)
ID Tomsic, Erika (Author)
ID Chhikara, Manisha (Author)
ID Pastukhova, Nadiia (Author)
ID Tkachuk, Vadym (Author)
ID Dixon, Alex (Author)
ID Mavrič, Andraž (Author)
ID Hashemi, Payam (Author)
ID Sabaghi, Davood (Author)
ID Shaygan Nia, Ali (Author)
ID Bratina, Gvido (Author)
ID Pavlica, Egon (Author)
Files:.pdf 1-s2.0-S0925963523002042-main.pdf (1,97 MB)
MD5: 564ACF3AA616DDCD467E7AC906F04BB5
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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.
Keywords:charge transport, multilayered network, flakes, time-of-flight photoconductivity, MXene exfoliation, high-mobility solution-cast thin-film, semiconducting MXene
Publication status:Published
Publication version:Version of Record
Publication date:01.01.2023
Year of publishing:2023
Number of pages:str. 1-6
Numbering:Vol. 135, [article no.] ǂ109879
PID:20.500.12556/RUNG-8102-c16c2c18-521d-7175-6753-510f5b05944d New window
COBISS.SI-ID:147310851 New window
ISSN on article:0925-9635
DOI:10.1016/j.diamond.2023.109879 New window
Publication date in RUNG:31.03.2023
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Record is a part of a journal

Title:Diamond and related materials
Publisher:Elsevier, Elsevier Sequoia
COBISS.SI-ID:15347205 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:P1-0055
Name:Biofizika polimerov, membran, gelov, koloidov in celic


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:31.03.2023