Journal
IEEE ELECTRON DEVICE LETTERS
Volume 38, Issue 1, Pages 130-133Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2016.2627538
Keywords
Tunnel field effect transistor (TFET); phosphorene; scaling; quantum transport; NEGF; hetero-junction
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Funding
- Center for Low Energy Systems Technology, one of six centers of STARnet
- Semiconductor Research Corporation Program through Microelectronics Advanced Research Corporation
- Semiconductor Research Corporation Program through Defense Advanced Research Projects Agency
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Thickness engineered tunneling field-effect transistors (TE-TFET) as a high-performance ultra-scaled steep transistor is proposed. This device exploits a specific property of 2-D materials: layer thickness-dependent energy bandgaps (E-g). Unlike the conventional hetero-junction TFETs, TE-TFET uses spatially varying layer thickness to form a hetero-junction. This offers advantages by avoiding the lattice mismatch problems at the interface. Furthermore, it boosts the ON-current to 1280 mu A/mu m with 15-nm channel length. Providing higher ON currents, phosphorene TE-TFET outperforms the homojunction phosphorene and the TMD TFETs in terms of extrinsic energy-delay product. TE-TFET also scales well to 9 nm with constant field scaling E = V-DD/L-ch = 33 mV/nm. In this letter, the operation principles of TE-TFET and its performance sensitivity to the design parameters are investigated through full-band atomistic quantum transport simulations.
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