| Title: | Time-of-flight photoconductivity investigation of high charge carrier mobility in ▫$Ti_3C_2T_x$▫ MXenes thin-film |
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| 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) |
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| Files: |  1-s2.0-S0925963523002042-main.pdf (1,97 MB)
MD5: 564ACF3AA616DDCD467E7AC906F04BB5
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| 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. |
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| Keywords: | charge transport, multilayered network, flakes, time-of-flight photoconductivity, MXene exfoliation, high-mobility solution-cast thin-film, semiconducting MXene |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.01.2023 |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 1-6 |
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| Numbering: | Vol. 135, [article no.] ǂ109879 |
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| PID: | 20.500.12556/RUNG-8102-c16c2c18-521d-7175-6753-510f5b05944d  |
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| COBISS.SI-ID: | 147310851 |
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| UDC: | 53 |
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| ISSN on article: | 0925-9635 |
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| DOI: | 10.1016/j.diamond.2023.109879 |
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| NUK URN: | URN:SI:UNG:REP:AVLCDUMO |
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| Publication date in RUNG: | 31.03.2023 |
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| Views: | 2171 |
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| Downloads: | 9 |
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