Galvanostatic Electrochemical Deposition Research Articles

H2O2Treatment of Electrochemically Deposited Cu2O Thin Films for Enhancing Optical Absorption

Cu2O is considered to be promising as an absorber layer material of solar cells, but its band gap (about 2.1 eV) is larger than the optimum one (about 1.5 eV). CuO has a smaller band gap of about 1.35 eV. Therefore, we attempted to oxidize Cu2O using H2O2to increase oxygen ratio and decrease band gap. Cu2O thin films were deposited on indium-tin-oxide-coated glass from an aqueous solution containing CuSO4, lactic acid, and KOH by the galvanostatic electrochemical deposition at 40°C with current density of −1 mA/cm2. Then, the as-prepared copper oxide thin film was dipped in H2O2(30%) at fixed temperature to oxidize for some time. By the H2O2treatment at room temperature, the oxygen content was increased, and the band gap was decreased.

Improvement of Electrochemically Deposited Cu2O/ZnO Heterojunction Solar Cells by Modulation of Deposition Current

Cu2O thin films were deposited on indium–tin-oxide-coated glass from an aqueous solution containing CuSO4, lactic acid and KOH by the galvanostatic electrochemical deposition at 40 °C with several different current densities. The photo-absorption of Cu2O was increased and the conduction type was changed from weak p-type to clear p-type by raising the current value. Cu2O(2)/Cu2O(1)/ZnO three-layer heterojunctions were fabricated electrochemically by modulation of deposition current density of Cu2O. The first Cu2O layer Cu2O(1) was deposited at a lower deposition current, and the second one Cu2O(2) at a higher current. Under the optimized condition, the conversion efficiency of a Cu2O(2)/Cu2O(1)/ZnO solar cell was found to be higher than that of a Cu2O(1)/ZnO solar cell.

Polycrystalline Cu7Te4 Dendritic Microstructures Constructed by Spherical Nanoparticles: Fast Electrodeposition, Influencing Factors, and the Shape Evolution

Polycrystalline Cu7Te4 dendritic microstructures were successfully synthesized via a simple galvanostatic electrochemical deposition method at room temperature, employing a mixed solution containin...

Conducting Nanopearl Chains Based on the Dmit Salt

Nanowire arrays of crystalline [(CH3)4N][Ni(dmit)2]2 have been fabricated by a galvanostatic electrochemical deposition method using anodic aluminum oxide as the template. A nanopearl chain structure associated with the oscillation of the voltage during the electrochemical deposition process was investigated. These nanowire arrays are highly textured as determined by XRD. The preliminary results show that the conductivities of the nanowires are in the semiconductor range.