contact potential

How Do You Calculate Built-in Potential? The built-in potential (at 300 K) equals fi = kT/q ln(1016 x 9 x 1017/ni2) = 0.77 V, using kT/q = 25.84 mV and ni = 1010 cm-3. The built-in potential (at 100°C) equals fi = kT/q ln(1016 x 9 x 1017/ni2) = 0.673 V, using kT/q = 32.14