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And if they’re already in use today, why are they the solar panel industry’s best-kept secret?
Not being able to watch the video now, I don't quite understand this question. I'm not aware of the use of this type of panel, but I don't think it's a well-kept secret. The only thing I know about these panels is that they have a little less performance but a much lower cost.
I think he's just pointing out that you'd expect people to have heard of them if they're in fairly widespread use. I don't recall having heard of them before, but it seems like you already know the main points about them.
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Ah, okay! It's quite possible that it's not widespread, I know because I had a course on renewable energies in my university studies (electrical engineering).
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Globally, it isn't used much, but about 20% of the US market is CdTe.
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