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采用溶胶-凝胶法和旋转涂覆法在FTO导电玻璃上制备ZnO种子层,以Zn(NO3)2和六亚甲基四胺(HMT)的混合溶液为生长液在ZnO种子层上制备出ZnO纳米棒薄膜,利用X射线衍射(XRD)、扫描电镜(SEM)对ZnO种子层及纳米棒薄膜的晶相及表面微观形貌进行了表征;研究了生长液浓度、生长时间对ZnO纳米棒薄膜生长的影响。实验表明,制备排列整齐的ZnO纳米棒阵列薄膜最佳条件为90℃环境下,基底竖直放置在0.025mol/L的生长液中,生长4h,纳米棒平均直径80nm左右。从新鲜草莓、桑葚中提取天然色素,对ZnO纳米棒电极进行敏化,组装成光电池;测试敏化电极的吸收光谱及光电池的伏安特性曲线。结果表明,桑葚色素在可见光区有更强的吸收特性,由桑葚色素敏化的电极组装的光电池,在模拟太阳光下,得到开路电压为228.75mV,短路电流为189μA,填充因子为0.37,光电转换效率为5.5×10-4。
ZnO seed layer was prepared on FTO conductive glass by sol-gel method and spin-coating method. ZnO seed layer was prepared by using mixed solution of Zn (NO3) 2 and hexamethylenetetramine (HMT) as growth solution ZnO nanorod films. The crystal phase and surface morphology of ZnO seed layer and nanorod films were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of concentration of growth solution and growth time on the growth of ZnO nanorods Effect of film growth. Experiments show that the preparation of aligned ZnO nanorod array film optimum conditions for 90 ℃ environment, the substrate placed vertically in 0.025mol / L of growth solution, growth 4h, the average diameter of about 80nm nanorods. The natural pigment was extracted from fresh strawberry and mulberry and the ZnO nanorod electrode was sensitized and assembled into a photo cell. The absorption spectrum of the sensitized electrode and the voltammetry curve of the photo cell were tested. The results showed that the mulberry pigment had stronger absorption in the visible light region. The photocell assembled by mulberry pigment sensitized electrode showed an open circuit voltage of 228.75mV under simulated sunlight, a short circuit current of 189μA, a fill factor of 0.37, Conversion efficiency of 5.5 × 10-4.