Charge trap Model 整理 Lisa L Wang 2013-5-28
OUTLINE 物理机理介绍 Model 推导 提参 验证及讨论
物理机理 Ec S ntr ns EF EV x0 Ec Δz ET EV 传导电流:PF 电流 Ref:PVD,CVD制备的insulator中,RF-MEMS,Fe-RAMs,FeFETs 等器件中也存在一些可靠性问题。 2012:JAP,11,054112
Model derivation (1) x’,t’换回x,t Ref:2012,JAP,intermediate thickness;PF Ref:2011,JAP,Nathan 1975, JAP, transient conduction in insulators at high filed x’,t’换回x,t
Model derivation (2) X<x0,x>x1,ntr 指数衰减,在x0-x1之间近似以浓度NT均匀分布, 因而 取
Model derivation (3) E:electric field
Model –K2 (Appendix)
Model –K2-Vp (Appendix) Vp:EF reaches Em
Parameter extraction 需要提取的参数: IGZO:a,H,ΦB, σB Insulator:NT,r,фt, ф1, β, 已知的参数:q,kT,x (location),L ,tox
提参流程 A,E NT,a Vth-T-t m , n, C(T),p(T), C(Vg),p(Vg) Vth-Vg-t D Φ1 C(Vg),C(T) Φt ,ζ B(Vg),B(T) K2(Vg),K2(T) md*,Φn ΦB, σB
提参 step 1a-m,n,c,p m n c p Adjusted R-square RT 3.35e-4 2.521 0.9767 50℃ 0.45 1.5e-3 1.98e-3 2.093 0.9877 80℃ 1.044e-2 2.168 0.9722 Vg_str m n c p R-Square 10V 5.308e-5 2.789 15V 0.45 1.5e-3 3.349e-4 2.521 0.9767 20V 1.832e-3 1.99 0.9874
提参 step 1b-lnC-Φt,ζ T (K) kT/q q/kT C ln(C) 300 0.026 38.46154 -8.00138 323 0.027993 35.72279 1.98E-03 -6.22466 353 0.030593 32.68686 1.04E-02 -4.56211 Field E(V/cm) E^0.5 C ln(C) model C 1.00E+06 1.00E+03 5.31E-05 -9.84371 4.98247E-05 1.50E+06 1.22E+03 3.35E-04 -8.00168 0.000336582 2.00E+06 1.41E+03 1.83E-03 -6.30235 0.001684671
提参step 2-A B D E K2 A D E B K2 model K2 Model B RT 2.592 0.399 50℃ 0.47 0.99 3.19e-3 2.145 0.911 1.17705 80℃ 2.223 5.675 4.0 Vg_str A D E B K2 10V 2.87 0.115 15V 0.47 0.99 3.19e-3 2.59 0.399 20V 2.04 0.672 D x0=1nm=1e-7cm, A a=1.57e7/cm,1/a=6.38A NT=1.59e18/cm3
提参step3-K2-md*, Φn, λ General model: f(x) = a*(x-b)^c Coefficients: Goodness of fit: SSE: 3.988e-010 R-square: 1 Vg_str A D E B K2 10V 2.87 0.115 15V 0.47 0.99 3.19e-3 2.59 0.399 20V 2.04 0.672 Vp=8.146,Φn=0.1V, md*=0.25m0 Nc=3.11e18 λ=0.9515/6=0.159
提参step3-K2-ΦB,σB,H A D E B K2 model K2 Model B RT 2.592 0.399 2.588 50℃ 0.47 0.99 3.19e-3 2.145 0.911 1.205 2.341 80℃ 2.223 5.675 4.0 2.055 T (K) kT/q q/kT C ln(C) 300 0.026 38.46154 3.35E-04 -8.00138 323 0.027993 35.72279 1.98E-03 -6.22466 353 0.030593 32.68686 1.04E-02 -4.56211 Φb= 0.415, σb=0.01 H=4.34e6,
利用model得到的参数(不必放在文章中,仅为方便画图) Vg_str Model m n Mode C Model K2 Model B Model p c p 10V 4.98e-5 0.114 2.902 2.816 5.308e-5 2.789 15V 0.45 1.5e-3 3.37e-4 0.399 2.588 2.517 3.349e-4 2.521 20V 1.685e-3 0.673 2.077 2.027 1.832e-3 1.99 Tstr m n Model C model K2 Model B Model p c p RT 3.37e-4 0.399 2.588 2.517 3.35e-4 2.521 50℃ 0.45 1.5e-3 1.72e-3 1.205 2.34 2.281 1.98e-3 2.093 80℃ 1.051e-2 4.0 2.0552 2.0059 1.044e-2 2.168
Parameters parameter value meaning a a=1.57e7/cm H H=4.34e6 ΦB λ λ=0.159 md* 0.25m0 NT NT=1.59e18/cm3 фt 1.506 фn 0.1 ф1 0.15 (x0=1nm,Vg=15V) ζ 1.738
验证
讨论 ntr分布及变化,x1 NT, фt Vg,T ΔVth~t 的变化