Effective barrier height

Figure 6 The extent of conversion is displayed as a function of time for several effective barrier heights in the polymer PMF (a) no barrier, i.e., the constant force or biased poterttial case, (b) 4kBT, (c) OkeT, and (d) SkeT.

There arc several niches where LB films could have a useful role in semiconductor technology. Probably the most important is the ability ol an oriented monolayer lo change the effective barrier height at a semiconductor surface. Researchers at the University of Durham first... 

The two-mode model has two characteristic crossover temperatures that correspond to the freezing of each vibration. At temperatures above Tc0 = h(o0/2kB, the rate constant k(T) exhibits its ordinary Arrhenius form, in which the activation energy is determined by the effective barrier height... 

Fig. 9.8. The bias dependence of the effective barrier height of Pd on n-type a-Si H with different doping levels, showing the reduction due to tunneling as the field at the contact increases (Jackson et al. 1986).

In Eq. 73, T is a pre-factor close to unity, which depends weakly on the effective barrier height Vac — E x). The distance dependence of the tunneling probability is determined by... 

This is rationalized by the fact that the probability of finding an electron in vacuum at a distance Ax from the surface of phase A is proportional to [il/y Ax)] oc g-2Kvac x Pqj. effective barrier height of 1 eV, calculation shows that 2ATvac is about 1 A. ... 

The tunneling probability over a barrier of given width Ax depends critically on the effective barrier height vac - E x). We should keep in mind that the... 

---