# Why are silicon and germanium used as semiconductors but not other metalloids?

The semiconductor materials are either elementary such as silicon and germanium or compound such as gallium arsenide. Silicon is the most used semiconductor for discrete devices and integrated circuits.

However, other metalloids like antimony and tellurium are not used as semiconductors. Is it because they are too expensive to extract or is there another reason for this?

• Astatine is highly radioactive and unstable, most stable isotope half life about 8hrs. Not a desirable characteristic for a semiconductor – Waylander Feb 19 '18 at 22:45
• It's not important if sth is metalloid, important is its bandgap. – Mithoron Feb 19 '18 at 23:02
• Alright, Astatine is out of the picture, but what about the others? @Waylander – dr.drizzy Feb 19 '18 at 23:02
• The ones you mention aren’t semiconductors. Carbon is a wide band gap semiconductor, with limited doping options. Tin and lead are semi metals and metals. Not much else to say... – Jon Custer Feb 19 '18 at 23:18

• What about other elements in the C Si Ge priodic table column, like Sn Pb? I've seen no usage of such elements as semi-conductors. Are there some? – Xenos Aug 30 '19 at 8:05