Journal article
Ultra-High Speed, High-Sensitivity Spin-Cast MXene-Semiconductor-MXene Photodetectors
Advanced functional materials
07 Oct 2022
Abstract
A simple room-temperature process of depositing MXene on a III-V structure with embedded 2D electron gas (2DEG) is used, which results in a large area, 2x104 mu m2$2 \times {10<^>4}\mu {m<^>2}$, photodetector (PD) device that greatly outperforms vacuum deposited Ti/Au metal-semiconductor-metal (MSM) PD's. By co-optimizing properties of 2D MXene contacts and the III-V material heterojunctions, this device sets new operating records with responsivity up to 1.04 A W--(1) at low optical powers, corresponding to >230% internal quantum efficiency, dark current of 50 fA mu m2$\frac{{fA}}{{\mu {m<^>2}}}$, >105.6-dB dynamic range, and 25-150 ps response time, which improves the previous MXene-Semiconductor-MXene responsivity by >2.7 times and is 7 x 10(3) --10(6) times faster compared to other MXene-based PDs. This is achieved by enhancing the Schottky barrier height by forming a Van der Waals (vdW) heterojunction between a wide bandgap AlGaAs surface layer and spin coated Ti3C2Tz electrodes. A layered architecture transports the optically generated electrons to a 2DEG channel at the GaAs/AlGaAs heterointerface, where they are rapidly collected. The landscaped electric field pushes the slow holes to an underlying low temperature-grown GaAs (LT-GaAs) region where they recombine. The proposed Schottky-2DEG Photoconductor-Schottky model for device operation shows how this device circumvents the canonical limitations of gain-bandwidth product, and carrier transit time, while replacing the need for vacuum deposition of gold or other precious metals.
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Details
- Title
- Ultra-High Speed, High-Sensitivity Spin-Cast MXene-Semiconductor-MXene Photodetectors
- Creators
- Kiana Montazeri - Drexel UniversityMarc Currie - United States Naval Research LaboratoryMichel W. Barsoum - Drexel UniversityBahram Nabet - Drexel University
- Publication Details
- Advanced functional materials
- Publisher
- Wiley
- Number of pages
- 12
- Grant note
- Office of Naval Research 1904171 / NSF ICORP DMR 1740795 / NSF Ceramics Division Award 2026118 / NSF SBIR Phase I Award Singh Center for Nanotechnology at University of Pennsylvania Nanograss Solar LLC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Electrical and Computer Engineering; Materials Science and Engineering
- Web of Science ID
- WOS:000864921200001
- Scopus ID
- 2-s2.0-85139458074
- Other Identifier
- 991019189196804721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied
- Physics, Condensed Matter