1.  1 E F 1  2 E F 2 E vac Metal-metal contact

2.  1  2 ee ee ee ee E vac Metal-metal contact

3.           E F  2  1   =

4. E V E C E F Si   M E F M E vac Metal-silicon contact (smaller metal work function)

5. E V E C E F Si  E vac ee ee ee ee  Si  M Metal-silicon contact (smaller metal work function)

6.  M  Si            E F Metal-silicon contact (smaller metal work function)

7.  M E F M E vac E V E C E F Si  Metal-silicon contact (larger metal work function)

8.  M E F M E vac E V E C E F Si   ee ee ee ee Metal-silicon contact (larger metal work function)

9.  Si  M            E F Metal-silicon contact (larger metal work function)

10. E vac E V E C E F Si  E F M  M Metal-silicon contact (equal work functions)