What are the advantages and the disadvantages of a p-n Junction diode over a thermionic valve diode? – NABTEB QUESTION

The advantages of a P – n junction diode are:

1. It is much smaller
2. It needs only smaller P.d to operate in the radio receiver
3. It is cheaper
4. It requires no time to warm up to produce the current carriers since it is a semiconductor
5. It can be operated with low voltage source
6. It is strong and not easily destroyed;

The disadvantage of P-n junction:

1. It is a non-ohmic conductor;
2. When polarized, only a very small current flows