Synthesis and Characterization of Spinel-Type NiCr_2O_4 Nanocrystalline

摘要

In this article, spinel-type NiCr_2O_4 Nanocrystalline were prepared by the citrate method. After doping it into P25 (degussa, TiO_2), NiCr_2O_4/TiO_2 thin film photoanode were prepared by screen printing process on the surface of Fluorine Tin Oxide (FTO) Glass. And then they were assembled into Dye sensitized TiO_2 Nanocrystalline solar cells (DSSC). The as-prepared NiCr_2O_4 powders were characterized by differential thermal analysis/thermo gravimetry (DTA/TG), X-ray diffraction (XRD) and ultraviolet visible (Uv-Vis) diffuse spectra. The properties of the solar cells were investigated by Solar Simular and Keithley Sourcemeter, respectively. The results showed that the grain size of the NiCr_2O_4 particles obtained at optimum synthesis temperature (1000 °C) was about 40.23 nm and the band gap was 1.8ev. The cell properties increased when the doping amount of NiCr_2O_4 was lwt%. The open-circuit voltage (V_(oc)) of Dye Sensitized TiO_2 Nanocrystalline Solar Cell was from 0.71V up to 0.73V, The short-circuit photocurrent (J_(sc)) of DSSC increased from 5.21mA·cm~(-2) to 6.95mA·cm~(-2). The photoelectric conversion efficiency (n) was from 2.40% up to 3.14%, which was 30.8% higher than the pure TiO_2 thin film photoanode.