IEICE Trans - Simulation of Gate-All-Around Tunnel Field-Effect Transistor with an n-Doped Layer

Simulation of Gate-All-Around Tunnel Field-Effect Transistor with an n-Doped Layer

Dong Seup LEE  Hong-Seon YANG  Kwon-Chil KANG  Joung-Eob LEE  Jung Han LEE  Seongjae CHO  Byung-Gook PARK

Publication
IEICE TRANSACTIONS on Electronics   Vol.E93-C   No.5   pp.540-545
Publication Date: 2010/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.540
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Fundamentals and Applications of Advanced Semiconductor Devices)
Category: Multi-Gate Technology
Keyword:
tunnel field-effect transistor,  subthreshold swing,

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Summary:
We propose a gate-all-around tunnel field effect transistor (GAA TFET) having a n-doped layer at the source junction and investigate its electrical characteristics with device simulation. By introducing the n-doped layer, band-to-band tunneling area is increased and tunneling barrier width is decreased. Also, electric field induced by gate bias is increased by the surrounding gate structure, which makes it possible to obtain a more abrupt band-bending. These effects bring about a significant improvement in on-current and subthreshold characteristics. GAA TFET with n-doped layer shows subthreshold swing at I_d = 1 nA/µm of 32.5 mV/dec, average subthreshold swing of 20.6 mV/dec. With comparison to other TFET structures, the merits of the proposed device are demonstrated and performance dependences on device parameters are characterized by extensive simulations.