2-2. Ohmic contact (Ohmic junction) Φm < Φn

Let the work function of a metal be Φm and that of an n-type semiconductor be Φn. When Φm < Φn, an ohmic junction is formed when the semiconductor is in contact with the metal.
Figure 2-4 shows the band diagram of an ohmic junction formed by an n-type semiconductor and a metal. The ohmic junction has no diffusion barrier. Therefore, application of external voltage causes current to flow regardless of its polarity. Unlike the Schottky junction, the ohmic junction does not exhibit diode-like rectifying properties. For example, the ohmic junction is used for bonding pads on a semiconductor chip to create interconnections with its package.

Figure 2-5 Ohmic junction
Figure 2-5 Ohmic junction

Chapter2 Basics of Schottky Barrier Diodes (Basic of Metal-semiconductor junction)

2. Metal-semiconductor junction
2-1. Schottky contact (Schottky junction) Φm > Φn
2-3. Conductivity modulation

Related information

A new window will open