First slide

Opto electronic juction devices

Question

A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly

Moderate

A

$10 \times 10^{14} Hz$
B

$5 \times 10^{14} Hz$
C

$1 \times 10^{14} Hz$
D

$20 \times 10^{14} Hz$

Solution

p -n photodiode is a semiconductor diode that produces a significant current when illuminated. It is reversed biased but is operated below the breakdown voltage. Energy of radiation = Band gap energy That is hv = 2.0 eV
or $v = \frac{2.0 \times 1.6 \times 10^{- 19}}{6.6 \times 10^{- 34}} \approx 5 \times 10^{14} Hz$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App