Research On Preparation And Properties Of P-CuSCN Film

Extensive attention has been given to nanocrystalline solar cells for their advantages including simple preparation, low cost, vast development space, etc. In recent years, p-CuSCN has become a research hotspot as a excellent p-type window material due to its good energe band matching with some photo anode materials, such as ZnO and TiO2, high optical transparency, stability, and favorable semiconductive properties for hole-transporting.In this paper, the current situation of nanocrystalline solar cells was overviewed. Also, CuSCN thin films with high chemical stability, favorable morphology, high purity and optical transparency were prepared on ITO conducting glass by electrochemical-deposition method from aqueous solution in which the Cu(II) cations were masked by different complexing agents to make the solution stable. The linear sweep voltammetry curves of sediment liquids show that the proper deposition voltage is between-200～-600mV. The products were characterized by XRD, SEM, EDS, and UV-VIS. The results indicate that the thin films are p-type semiconductors, and that the product has an obvious growth orientation with high purity as can be seen from the XRD spectrum which has almost no miscellaneous peak, and that the crystals are perfect pyramids in shape grown under the island-like mode, and that the band gap is calculated to be3.52eV.The formation mechanism of the films was studied by analysising the current-time curves at constant voltage. Discussion on the influence of different complexing agents on the results shows that ethanolamine has the best chelating behavior. The effects of stoichiometry, deposition time and deposition voltage on the morphology and diameter of the films were also studied. The optimum conditions obtained at last were as follows:the electrolyte composing was0.01mol/l CUSO4+0.04mol/l KSCN+0.1mol/l MEA, the deposition voltage-450mV(vs Ag/AgCl).Finally, this paper explored the method for preparing ZnO upon substrate on which CuSCN were deposited. The XRD and SEM results show that it is feasible to synthesize ZnO nano-array by hydro thermal method after a spin coating process.