pH-dependence of conduction type in cuprous oxide synthesized from solution

The formation of native point defects in cuprous oxide, Cu(2)O, synthesized from solution has been studied by first-principles calculations. Although p-type conduction is obtained in Cu(2)O synthesized from vacuum regardless of copper-rich or oxygen-rich conditions, intrinsically n-type Cu(2)O without doping can be grown in a strong acidic environment from solution. Our calculations show that both n-type and p-type Cu(2)O can be obtained depending on the solution pH value, which are in good agreement with our experimental results. (C) 2010 American Institute of Physics. [doi:10.1063/1.3452383]