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does anyone know where one can find a list, database, book of experimental bandgap values of semiconductors? Is there such a collection? Or do I need to scour papers one at a time to get the values?

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Before answering, please see our policy on resource recommendation questions. Please write substantial answers that detail the style, content, and prerequisites of the book, paper or other resource. Explain the nature of the resource so that readers can decide which one is best suited for them rather than relying on the opinions of others. Answers containing only a reference to a book or paper will be removed!

NIST has one from 1973 (second bullet on the right side of the page) – Kyle Kanos Mar 20 '14 at 20:25
There's also Landolt-Boernstein and the somewhat briefer website of the Ioffe Institute. – The Photon Mar 21 '14 at 5:02
Thanks guys! I think those are the best sources available! Cheers! =) – Yoon Ji Wei Mar 21 '14 at 13:06
Have you Googled it? – Evil Angel Jun 30 '14 at 6:05

I actually wanted to post this as a comment but due to a lack of points I cannot do so.

This is a pretty big list of semiconductors including their bandgaps and whether they are direct or not.

I hope this is what you are looking for.

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I don't think this should be a comment. It answers the question, so it should be an answer. – David Z May 27 '14 at 20:59

Converting a comment into an answer so the question will hopefully quit popping to the front page.

Three useful sources are

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