Charge carrier

Charge Carrier

在半导体物理的学习过程中，搞清楚半导体内部的原子结构是很重要的，它有助于让我们更好的理解半导体器件在电路中是如何工作的。

Intro

• Where do charge carriers come from?
• What type of charge carriers do we have?

---

• How can we modify the density of charge carriers?
• How do charge carriers move?
  ( We will solve these two questions in the next lecture)

Definition

• Charge carriers come from "electrons and holes（电子与空穴）"
  holes' movement is slower than electrons', because movement of holes is based on release and trap mechanisms.

density of holes (p) = density of electrons (n)= n_i
In summary,
p = n = n_i
p*n = n_i^2