P-n Junctions ECE 2204.

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p-n Junctions ECE 2204

p-n junctions When the same semiconductor is used to make the p-type region as the n-type region, the combination is called a homojunction. When two different semiconductors are used to make the p-n junction, it is called a heterojunction.

Continuity of Fermi Energy

IT = 0 mA when Va = 0 V There are, however, carriers flowing constantly across the p-n junction. drift e e e e e e e e e diffusion h h h h h h h h h diffusion drift

Built-In Voltage The built-in voltage is the voltage drop associated with the induced electric field between the p and n regions.

Questions How does the built-in voltage change with increasing temperature? Compare the built-in voltage for p-n junction (Na = 1018 cm-3, Nd = 1015 cm-3) p-n junction (Na = 1015 cm-3, Nd = 1018 cm-3) p-n junction (Na = 1017 cm-3, Nd = 1016 cm-3) For the same doping concentration, which semiconductor, Ge or Si, does the p-n junction has the smaller built-in voltage?