A threshold voltage analytical model for high-kgate dielectric MOSFETs with fully overlapped lightly doped drain structures

Fei Ma, Hong-Xia Liu, Qian-Wei Kuang, Ji-Bin Fan
2012 Chinese Physics B  
We investigate the influence of voltage drop across the lightly doped drain (LDD) region and the built-in potential on MOSFETs, and develop a threshold voltage model for high-k gate dielectric MOSFETs with fully overlapped LDD structures by solving the two-dimensional Poisson's equation in the silicon and gate dielectric layers. The model can predict the fringing-induced barrier lowering effect and the short channel effect. It is also valid for non-LDD MOSFETs. Based on this model, the
more » ... model, the relationship between threshold voltage roll-off and three parameters, channel length, drain voltage and gate dielectric permittivity, is investigated. Compared with the non-LDD MOSFET, the LDD MOSFET depends slightly on channel length, drain voltage, and gate dielectric permittivity. The model is verified at the end of the paper.
doi:10.1088/1674-1056/21/5/057304 fatcat:nr6lhhwlgvehbkwmo2t63uofim