Patent ID: 7018875

Claim:
A method of fabricating a semiconductor Insulated-Gate Field-Effect Transistor (Gated-FET), comprising: depositing a semiconductor thin film layer on a thick insulator; and forming a substantially rectangular channel region in said semiconductor thin film layer, said channel region lightly doped to form a resistive channel, wherein the height of the channel region comprising the entire thin film thickness; and depositing a gate insulator layer above said channel region; and depositing a gate material above said gate insulator layer, said material forming a gate region above said channel region; wherein optimizing said thin film properties, gate insulator properties and gate material properties such that said gate region further comprises: a first voltage level that modulates said channel resistance to a substantially non-conductive state by fully depleting majority carriers from said channel region; and a second voltage level that modulates said channel resistance to a substantially conductive state by at least partially accumulating majority carriers near the gate insulator surface in said channel region; and wherein depositing said semiconductor thin film layer further comprises: defining a surface voltage as Φ S =V D −V FB −T G *Q S /∈ G ; and defining a surface dopant level as N S =D*exp(qΦ S /kT); and defining a first thickness as L D =[∈ S *kT/(q 2 N S )] 0.5 ; and defining a second thickness as X A =√2*L D *[(N S /D) 0.5 −1]; and defining a surface charge as Q S =q*N S *X A /(1+X A /(√2*L D )]; and iteratively identifying the consistent set of values that satisfies said definitions; and depositing a substantially uniform thickness T S of said semiconductor thin film layer, wherein said thickness T S is greater than said second thickness X A ; where, V D is power supply voltage level, ∈ S is channel semiconductor permittivity, ∈ G is gate insulator permittivity, T G is gate insulator thickness, V FB is gate material to semiconductor channel absolute flat band voltage, k is the Boltzmann's constant, T is the absolute temperature, q is electron charge and D is channel region doping level.