Journal
NANOSCALE
Volume 6, Issue 15, Pages 8978-8983Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr02164a
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Funding
- Office of Basic Energy Sciences, U.S. Department of Energy
- National Science Foundation [ECCS-1055852, CBET-1264982, ECCS-1128297, DMR-1308436]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1308436] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1264982] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1055852, 1128297] Funding Source: National Science Foundation
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We investigate electrical transport and optoelectronic properties of field effect transistors (FETs) made from few-layer black phosphorus (BP) crystals down to a few nanometers. In particular, we explore the anisotropic nature and photocurrent generation mechanisms in BP FETs through spatial-, polarization-, gate-, and bias-dependent photocurrent measurements. Our results reveal that the photocurrent signals at BP-electrode junctions are mainly attributed to the photovoltaic effect in the off-state and photothermoelectric effect in the on-state, and their anisotropic feature primarily results from the directional-dependent absorption of BP crystals.
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