Solution-Processed Layered Gallium Telluride Thin-Film Photodetectors
- Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
- Northwestern Univ., Evanston, IL (United States). Graduate Program in Applied Physics
- Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering; Northwestern Univ., Evanston, IL (United States). Graduate Program in Applied Physics; Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Northwestern Univ., Evanston, IL (United States). Dept. of Electrical Engineering and Computer Science
Using scalable solution processing, layered gallium telluride (GaTe) nanoflake dispersions are produced in surfactant-free, low-boiling-point, water–ethanol cosolvent mixtures. During exfoliation, chemical degradation of the ambient-reactive GaTe crystals is minimized by using deoxygenated solvents in a sealed tip ultrasonication system. The structural and chemical integrity of the solution-processed GaTe nanoflakes is subsequently confirmed with a comprehensive suite of microscopic and spectroscopic analyses. Furthermore, field-effect transistors and phototransistors based on individual solution-processed GaTe nanoflakes show electronic and optoelectronic properties, respectively, that are comparable to micromechanically exfoliated GaTe. Minimal solution-processing residues from the surfactant-free, low-boiling-point cosolvent dispersion medium coupled with the high intrinsic hole doping of GaTe produces the highest electrical conductivity among solution-processed layered nanoflake thin films without post-treatment. Large-area photodetectors based on these electrically percolating thin films of solution-processed GaTe nanoflakes show a positive correlation between responsivity and illumination intensity, with a high photoconversion gain that is explained by a combination of defect-mediated optical processes and photothermal effects. Finally, overall, this study establishes solution-processed layered GaTe nanoflakes as a leading candidate for high-performance, large-area, thin-film photodetectors.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Light Energy Activated Redox Processes (LEAP); Northwestern Univ., Evanston, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0001059
- OSTI ID:
- 1566582
- Journal Information:
- ACS Photonics, Journal Name: ACS Photonics Journal Issue: 10 Vol. 5; ISSN 2330-4022
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
In-plane anisotropic electronics based on low-symmetry 2D materials: progress and prospects
|
journal | January 2020 |
Electronics from solution-processed 2D semiconductors
|
journal | January 2019 |
Synthesis and emerging properties of 2D layered III–VI metal chalcogenides
|
journal | December 2019 |
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Related Subjects
47 OTHER INSTRUMENTATION
anhydrous
bio-inspired
catalysis (heterogeneous)
catalysis (homogeneous)
charge transport
gallium telluride
hydrogen and fuel cells
liquid phase exfoliation
magnetism and spin physics
materials and chemistry by design
mesostructured materials
optics
phonons
photodetector
photosynthesis (natural and artificial)
solar (fuels)
solar (photovoltaic)
synthesis (novel materials)
synthesis (scalable processing)
synthesis (self-assembly)
transistor
two-dimensional
anhydrous
bio-inspired
catalysis (heterogeneous)
catalysis (homogeneous)
charge transport
gallium telluride
hydrogen and fuel cells
liquid phase exfoliation
magnetism and spin physics
materials and chemistry by design
mesostructured materials
optics
phonons
photodetector
photosynthesis (natural and artificial)
solar (fuels)
solar (photovoltaic)
synthesis (novel materials)
synthesis (scalable processing)
synthesis (self-assembly)
transistor
two-dimensional