6,13-diphenylpentacene(DPP) was synthesized by 6,13-pentacenequinone and the Grignard reagent with the SnCl2/HCl as the reducing agent. It was detected by 1H NMR, infrared spectra, X-ray diffraction (XRD), UV-visible spectra and fluorescence spectra. Substitution with phenyl at the C-6 and C-13 posi- tions of pentacene leads to phenomenal enhancement in solubility and a little enhancement in photooxidative stability. XRD results showed that the pattern of 6,13-diphenylpentacene was different from the patterns of pentacene and 6,13-pentacenequinone. UV-Visible spectra showed that the λmax of DPP in HCCl3 was 600 nm. The fluorescence spectra showed that DPP emitted purple (430 nm) and red (612 nm) when excited by UV, while only emitted red when excited by visible light. But it is still sus- ceptible to photooxidation. The photooxidation product of DPP was also studied.
FU YaLi ZHANG JingChang ZENG Ting HUANG Zhong CAO WeiLiang
A nano-crystal N–Zn/TiO 2 anode film was prepared using a combined technology. X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy and cyclic voltammetry characterizations showed that the two elements N and Zn were doped into nano-crystal TiO 2 successfully. This resulted in a strong redshift in the UV-Visible spectrum. UV-Visible measurements showed that the light absorption of N719 and P3OT were complementary and covered the entire visible region. This led to a high utilization of visible light. Solar cells based on the N–Zn/TiO 2 anode film were co-sensitized using P3OT and N719. The cells have a short-circuit current density of 7.91 mA/cm 2 , an open-circuit photovoltage of 0.659 V, and a photoelectric conversion efficiency of 2.64%. Also, the relationship among the N–Zn/TiO 2 -film anode’s electric structure, the dye’s LUMO, electrochemical impedance, and photoelectric conversion efficiency are discussed in the paper.
