Journal
ADVANCED MATERIALS
Volume 31, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201903271
Keywords
metal-semiconductor-metal; MXene; photodetectors; Schottky contacts; semiconductors; work-function
Categories
Funding
- NSF ICORPS [1904171]
- Office of Naval Research
- NSF Ceramics Division [DMR 1740795]
- U.S. DOE office of Science Facility, at Brookhaven National Laboratory [DESC0012704]
- Nanograss Solar LLC
- Singh Center for Nanotechnology at University of Pennsylvania
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2D transition metal carbides, known as MXenes, are transparent when the samples are thin enough. They are also excellent electrical conductors with metal-like carrier concentrations. Herein, these characteristics are exploited to replace gold (Au) in GaAs photodetectors. By simply spin-coating transparent Ti3C2-based MXene electrodes from aqueous suspensions onto GaAs patterned with a photoresist and lifted off with acetone, photodetectors that outperform more standard Au electrodes are fabricated. Both the Au- and MXene-based devices show rectifying contacts with comparable Schottky barrier heights and internal electric fields. The latter, however, exhibit significantly higher responsivities and quantum efficiencies, with similar dark currents, hence showing better dynamic range and detectivity, and similar sub-nanosecond response speeds compared to the Au-based devices. The simple fabrication process is readily integratable into microelectronic, photonic-integrated circuits and silicon photonics processes, with a wide range of applications from optical sensing to light detection and ranging and telecommunications.
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