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

التفاصيل البيبلوغرافية
العنوان: Time-of-flight photoconductivity investigation of high charge carrier mobility in Ti3C2Tx MXenes thin-film
المؤلفون: Jurij Urbančič, Erika Tomsič, Manisha Chhikara, Nadiia Pastukhova, Vadym Tkachuk, Alexander Dixon, Andraž Mavrič, Payam Hashemi, Davood Sabaghi, Ali Shaygan Nia, Gvido Bratina, Egon Pavlica
المصدر: Diamond and Related Materials
سنة النشر: 2023
مصطلحات موضوعية: Mechanical Engineering, Materials Chemistry, General Chemistry, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
الوصف: 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.
وصف الملف: application/pdf
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::046d67aa086836ff07cabbd5d33e1a24
https://hdl.handle.net/21.11116/0000-000D-4D7A-521.11116/0000-000D-4D7C-3
Rights: OPEN
رقم الانضمام: edsair.doi.dedup.....046d67aa086836ff07cabbd5d33e1a24
قاعدة البيانات: OpenAIRE