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Piranha solution, also known as piranha etch, is a mixture of sulfuric acid (H2SO4) and hydrogen peroxide (H2O2). The resulting mixture is used to clean organic residues off substrates, for example silicon wafers. [1] Because the mixture is a strong oxidizing agent, it will decompose most organic matter, and it will also hydroxylate most ...
Piranha solution in particular constitutes quite a harsh treatment that can potentially damage the integrity of the silicon surface. Finlayson-Pitts et al. investigated the effect of certain treatments on silicon and concluded that both the roughness (3-5 Å) and the presence of scattered large particles were preserved after 1 cycle of plasma ...
The RCA clean is a standard set of wafer cleaning steps which need to be performed before high-temperature processing steps (oxidation, diffusion, CVD) of silicon wafers in semiconductor manufacturing. Werner Kern developed the basic procedure in 1965 while working for RCA, the Radio Corporation of America. [1][2][3] It involves the following ...
A piranha or piraña (/ pɪˈrɑːnjəˌ - ræn /, or / pɪˈrɑːnə /; Portuguese: [piˈɾɐ̃ɲɐ], Spanish: [piˈɾaɲa]) is any of a number of freshwater fish species in the family Serrasalmidae, [1] or the subfamily Serrasalminae within the tetra family, Characidae [2] in order Characiformes. These fish inhabit South American rivers ...
Aqua regia (/ ˈreɪɡiə, ˈriːdʒiə /; from Latin, "regal water" or "royal water") is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. [b] Aqua regia is a fuming liquid. Freshly prepared aqua regia is colorless, but it turns yellow, orange or red within seconds from the formation of nitrosyl chloride and ...
Etching (microfabrication) Etching tanks used to perform Piranha, hydrofluoric acid or RCA clean on 4-inch wafer batches at LAAS technological facility in Toulouse, France. Etching is used in microfabrication to chemically remove layers from the surface of a wafer during manufacturing. Etching is a critically important process module in ...
Base Piranha Solution[edit] I noticed that this article only concerns acidic Piranha Solution (sulphuric acid + hydrogen peroxide). There is an alternative mixture that uses ammonium hydroxide (NH 3 (aq)) in place of sulphuric acid. As far as I can tell, the two solutions are very similar, but have a few differences.
An NMR tube filled with a colorless sample, sealed with a green polyethylene cap and Parafilm. An NMR tube is a thin glass walled tube used to contain samples in nuclear magnetic resonance spectroscopy. Typically NMR tubes come in 5 mm diameters but 10 mm and 3 mm samples are known. It is important that the tubes are uniformly thick and well ...