I know it isn't.
Gallium is and Arsenic is.

I don't like them on their own, although arsenic has its uses.
( Master Of Turnips. Only gays and morons believe in ghosts., Tue 12 May 2009, 0:29, archived)

GaAs is pretty rough as a semiconductor.
They're looking into carbon transistors now, which is pretty cool stuff.
( Moon Girl Technologies horrendous beanbag, Tue 12 May 2009, 0:30, archived)

A bit like Gi and Tn
Shit on their own, but more than slightly better when combined
( mns 2️⃣2️⃣9️⃣0️⃣7️⃣, Tue 12 May 2009, 0:32, archived)

let us not forget
V and Rb
( Rotating Wobbly Hat That's not a banana. THIS is a banana., Tue 12 May 2009, 0:36, archived)