# Why are holes the majority carrier in P-Type semiconductor?

It is said that P-Type semiconductors' majority carriers are holes. But based on my current understanding, there should be no extra holes except for those generated by heat (i.e. electron-hole pairs like in intrinsic semiconductors).

Lets assume we have a P-Type semiconductor – Silicon doped with Boron (with an Boron atom in the middle in the image below).

• Thank you for answer. You wrote that Boron can form 3 complete bonds – do you know how is the 4th one – the "incomplete" – bond called (I guess it isn't covalent)? – sarasvati Jan 11 '16 at 0:12