Different concentrations of Br2/Methanol solution were used for chemical etching on the LPE Hg Cd Te surface. Then we measured erosion rate and analysed surface conditions of Hg Cd Te through atomic force microscope(AFM) and X-ray photoelectron spectroscopy(XPS). It was found that etching treatment of Hg Cd Te in Br2/Methanol solution introduces serious Te-rich surface and low rms roughness.
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