All-Solution-Processed Quantum Dot Electrical Double-Layer Transistors Enhanced by Surface Charges of Ti3C2Tx MXene Contacts
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2022-02-26
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ArticleAuthors
Kim, Hyunho
Nugraha, Mohamad Insan

Guan, Xinwei

Wang,Zhenwei
Hota, Mrinal Kanti

Xu, Xiangming

Wu, Tao

Baran, Derya

Anthopoulos, Thomas D.

Alshareef, Husam N.

KAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
KAUST Solar Center (KSC), Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
KAUST Solar Center (KSC)
KAUST Grant Number
OSR-2018-CARF/CCF-3079Date
2021-02-26Embargo End Date
2022-02-26Submitted Date
2020-12-14Permanent link to this record
http://hdl.handle.net/10754/667696
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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 cm2 V-1 s-1 and current modulation of 1.87 × 104 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 ∼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.Citation
Kim, H., Nugraha, M. I., Guan, X., Wang, Z., Hota, M. K., Xu, X., … Alshareef, H. N. (2021). All-Solution-Processed Quantum Dot Electrical Double-Layer Transistors Enhanced by Surface Charges of Ti3C2Tx MXene Contacts. ACS Nano. doi:10.1021/acsnano.0c10471Sponsors
The research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). M.I.N. and T.D.A acknowledge funding from the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-2018-CARF/CCF-3079.Publisher
American Chemical Society (ACS)Journal
ACS NanoPubMed ID
33635642Additional Links
https://pubs.acs.org/doi/10.1021/acsnano.0c10471ae974a485f413a2113503eed53cd6c53
10.1021/acsnano.0c10471
Scopus Count
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