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WebJan 5, 2016 · For this purpose, CAs were monitored after each step of the polysilicon wet etching process as follows: ① as-prepared polysilicon layer with 2000Å thickness, ② after dHF pre-treatment, and ③ after standard clean 1 (SC1) treatment (SC1 treatment was applied for the modification of polysilicon surface from hydrophobic, after HF treatment, … WebMay 16, 2024 · As the only U.S.-listed polysilicon company based in Xinjiang, Daqo can’t just ignore concerns from overseas investors and regulators, he said in an interview. “We understand there are these... WebOTC Markets Group - Official site of OTCQX, OTCQB and Pink Markets difference between brp and visa