Tellurium's not a rare earth element though. It is currently produced only in very small quantities, but my understanding is we just don't know much about how m

Tellurium's not a rare earth element though. It is currently produced only in very small quantities, but my understanding is we just don't know much about how much of it's available due to the fact that we didn't really use it for anything until CdTe photovoltaics came along. Worth noting too that this is only one of a number of thin film solar technologies, and that silicon rather than thin film still accounts for the vast majority of all production.