First slide

Types of semiconductors

Question

The energy of a photon of sodium light $λ (589 n m)$ equals the band gap of a semiconducting material. Find the minimum energy E (in eV) required to create a hole – electron pair.

Easy

A

2.1
B

3.0
C

5.4
D

1.5

Solution

The energy of photon $E = \frac{h c}{λ} = \frac{12400}{λ (i n \overset{o}{A})} e V$
$= \frac{12400}{5890} e V = 2.1 e V$

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