Task 5: Work Function Difference with Gold Gate

We worked on Task 5 to 7 this Friday at the computer lab. This blog will introduce Task 5. The figure shows below is about energy band diagram for gate. Work function is the minimum energy cost of moving an electron from Fermi level to infinity. In this case, the work function difference is equivalent to Φ_M-Φ_S, where Φ_S is X(Si)+E_g/2+Φ_F. Table 1 shows the meanings of different variables.

Figure 1: Energy Band Diagram

ΦM	The work function of metal;
ΦS	The work function of semiconductor;
X(Si)	Electron Affinity;
Eg	Bandgap energy;
ΦF	Fermi energy.

Table 1: The meanings of Variables