Maskless Dry Etching of GaAs by Focused Laser Beam
There has been increasing interest in the application of laser beams to semiconductor processing such as etching and deposition because of the potential for low temperature and maskless processes . Laser beams, furthermore, have a feature as a clean energy source in comparison with ion beams or plasmas, which inevitably induce lattice defects or impurity incorporation when applied to etching or deposition for semiconductor materials. Local etching of GaAs by ultraviolet laser photolysis , for example, is a low temperature process which does not induce lattice defects and, hence, does not need subsequent annealing processes. Dry etching by laser pyrolysis, on the other hand, induces a local temperature rise, but it realizes, by an order of 3 to 4, higher etching rates than ion-beam  or plasma etching.
KeywordsHelium Chlorine Pyrolysis GaAs Auger
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