The correct option is D All of the above
Applications of p-type and n-type semiconductors:
1. Used for making electronic components
2. Used for making diodes which is a combination of n-type and p-type semiconductors and is used as a rectifier.
3. Used for making transistors which contains n-p-n and
p-n-p junctions to amplify radio and audio signals.
4. Used for making solar cell which is an efficient photo-diode. These are used for conversion of light energy into electrical energy.
5. The solid state materials are produced by combination of elements of groups 13 and 15 compound.
E.g. InSb, AlP, GaAs.
6. The solid state compounds are obtained by combination of elements of groups 12 and 16 compounds.
E.g. ZnS, CdS, CdSe and HgTe.
Thus, all the given statements are correct.