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All wafers subsequently received a chemical etch containing HF and HN03 to simultaneously remove both the PSG from the front surface and the n+-Iayer on the back. Importantly, if not completely removed, this n+-layer can lead to significant performance loss due to shunting at localized areas where the screen printed AI fails to overcompensate the Si to produce the p+region.
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4Â¥: Originally posted by jerryzeng at 2012-07-10 09:51:05
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5Â¥: Originally posted by ÀáË®ÎÞºÛ at 2012-07-10 11:19:22
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