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High field transport of high performance black phosphorus transistors
Black phosphorus is a layered material stacked together by weak van der Waals force with a direct bandgap and highly anisotropic electrical characteristics. Most of the previous reports focus on the low-field mobility of transistors based on SiO2 back gate dielectrics. Recently, black phosphorus tra...
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Published in: | Applied physics letters 2017-04, Vol.110 (16) |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Black phosphorus is a layered material stacked together by weak van der Waals force with a direct bandgap and highly anisotropic electrical characteristics. Most of the previous reports focus on the low-field mobility of transistors based on SiO2 back gate dielectrics. Recently, black phosphorus transistors encapsulated with hexagonal boron nitride have been demonstrated with greatly improved mobility at low temperatures. However, this approach requires multiple dry transfer methods using both black phosphorus and boron nitride flakes, which are only available in small crystal sizes. Here, we demonstrated high performance black phosphorus transistors using atomic layer deposited high-κ HfO2 as a back gate dielectric. The maximum drain current density reaches 480 μA/μm at 300 K and a record high drain current 906 μA/μm at 20 K in a short channel 100 nm device based on HfO2, exhibiting excellent current-carrying capability and high field strength. Moreover, a side-by-side comparison on important figures-of-merit is carried out systematically for transistors based on HfO2 with those based on conventional SiO2, showing more than 50% performance improvement in mobility and over 8 times reduction in interface trap density. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.4982033 |