n-Type Cu[sub 2]O by Electrochemical Doping with Cl

Cuprous oxide is naturally p-type, which has prevented an efficient solar cell. n-Type doping of is demonstrated during electrochemical deposition by adding a chlorine (Cl) precursor to the aqueous solution. Current–voltage characterization reveals that the resistivity of undoped by electrochemical deposition is , while that of electrochemically doped with Cl is significantly reduced to as low as . X-ray diffraction confirms that the films are pure . Photocurrent measurements verify that Cl-doped is n-type. The solution-based doping method is particularly suitable for low-cost, large-area, and high-throughput fabrication of solar cells.