Journal article
All-Solution-Processed Quantum Dot Electrical Double-Layer Transistors Enhanced by Surface Charges of Ti3C2Tx MXene Contacts
ACS nano, v 15(3), pp 5221-5229
23 Mar 2021
PMID: 33635642
Abstract
Fully solution-processed, large-area, electrical double-layer transistors (EDLTs) are presented by employing lead sulfide (PbS) colloidal quantum dots (CQDs) as active channels and Ti3C2Tx MXene as electrical contacts (including gate, source, and drain). The MXene contacts are successfully patterned by standard photolithography and plasma-etch techniques and integrated with CQD films. The large surface area of CQD film channels is effectively gated by ionic gel, resulting in high performance EDLT devices. A large electron saturation mobility of 3.32 cm(2) V-1 s(-1) and current modulation of 1.87 x 10(4) operating at low driving gate voltage range of 1.25 V with negligible hysteresis are achieved. The relatively low work function of Ti3C2Tx MXene (4.42 eV) compared to vacuum-evaporated noble metals such as Au and Pt makes them a suitable contact material for n-type transport in iodide-capped PbS CQD films with a LUMO level of similar to 4.14 eV. Moreover, we demonstrate that the negative surface charges of MXene enhance the accumulation of cations at lower gate bias, achieving a threshold voltage as low as 0.36 V. The current results suggest a promising potential of MXene electrical contacts by exploiting their negative surface charges.
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Details
- Title
- All-Solution-Processed Quantum Dot Electrical Double-Layer Transistors Enhanced by Surface Charges of Ti3C2Tx MXene Contacts
- Creators
- Hyunho Kim - King Abdullah University of Science and TechnologyMohamad Nugraha - King Abdullah University of Science and TechnologyXinwei Guan - UNSW SydneyZhenwei Wang - King Abdullah University of Science and TechnologyMrinal K. Hota - King Abdullah University of Science and TechnologyXiangming Xu - King Abdullah University of Science and TechnologyTom Wu - UNSW SydneyDerya Baran - King Abdullah University of Science and TechnologyThomas D. Anthopoulos - King Abdullah University of Science and TechnologyHusam N. Alshareef - King Abdullah University of Science and Technology
- Publication Details
- ACS nano, v 15(3), pp 5221-5229
- Publisher
- Amer Chemical Soc
- Number of pages
- 9
- Grant note
- King Abdullah University of Science and Technology (KAUST); King Abdullah University of Science & Technology OSR-2018-CARF/CCF-3079 / King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000634569100130
- Scopus ID
- 2-s2.0-85103409063
- Other Identifier
- 991022059925604721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology