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A comment on Cheap material converts heat to electricity. Parent comment

Re:Cheap material converts heat to electricity by robbedpeter on Tuesday August 03, 2021 @11:37AM (#28050484)
Isn't graphene a high quality p type material as well?

What makes a material p or n?

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Re:Cheap material converts heat to electricity by robbedpeter on Tuesday August 03, 2021 @11:43AM (#28050578)
Kinda answered my own question with some searching - looks like p type has lots of electrons, n type has lots of holes, and graphene oxide (GO) makes an excellent and simple to use n type material.

Graphene can be modified by changing its topology to be p or n, but GO is n by default. Do electron and hole features have to match in these constructions?

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Re:Cheap material converts heat to electricity by steve_b on Tuesday August 03, 2021 @02:56PM (#28052768)
I think that's backwards: P-type has more holes than electrons, n-type has more electrons than holes.

https://simple.wikipedia.org/wiki/P-type_semiconductor (property 2)

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