Am using a soldering iron at room temperature to place indium contacts onto Ga As n type Si doped, Etch Pit density <10,000/cm2 Surface finish: front side mirror polished, back side lapped , etched. Carrier Concentration : 0.5 to 2x1018/cm3 How can I achieve good ohmic contacts, because my technique is giving me a lot of bad results. --------------------------------- Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo.