Transcription of Chapter 2 Semiconductor Heterostructures - Cornell …
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Semiconductor Optoelectronics (Farhan Rana, Cornell University) Chapter 2 Semiconductor Heterostructures Introduction Most interesting Semiconductor devices usually have two or more different kinds of semiconductors . In this handout we will consider four different kinds of commonly encountered Heterostructures : a) pn heterojunction diode b) nn heterojunctions c) pp heterojunctions d) Quantum wells, quantum wires, and quantum dots A pn Heterojunction Diode Consider a junction of a p-doped Semiconductor ( Semiconductor 1) with an n-doped Semiconductor ( Semiconductor 2).
exactly zero in the depletion regions of thicknesses xp and xn on the p-side and n-side of the junction, respectively. It is a good approximation to calculate the junction electric field and potential. The net charge density in the depletion regions is then due to the ionized donors and acceptors and is as shown below.
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