聚乙二醇对FTO基底上电沉积-热氧化制备的ZnO薄膜光电化学性能的影响

Effect of polyethylene glycol on photoelectrochemical performance of ZnO film prepared by electrodeposition-thermal oxidation on FTO substrate

通过先电沉积后热氧化的方法在氟掺杂SnO2(FTO)基底上制备了多孔ZnO薄膜。研究了聚乙二醇(PEG-6000)质量浓度对ZnO薄膜的形貌、结构及可见光光电流的影响。结果表明,在恒定电流密度7.0 mA/cm2沉积300 s的条件下,于含有0.4 mol/L ZnCl2、5.0 mol/L NH4Cl和0.4 mol/L H3BO3的镀液中添加10~200 mg/L的PEG-6000,有利于在FTO基底上得到结合良好的金属Zn沉积层,热氧化后转变为有基底Sn自发掺杂的多孔ZnO薄膜。其中PEG质量浓度为50 mg/L时制得的ZnO薄膜厚度最大、孔隙最多,表现出良好的光电化学性能。

Porous ZnO films were prepared on fluorine-doped SnO2(FTO)substrate by electrodeposition followed by thermal oxidation.The effect of mass concentration of polyethylene glycol(PEG-6000)on the morphologies,structures,and photocurrent response under visible light of the ZnO films were studied.The results showed that the addition of 10-200 mg/L PEG-6000 in the electrolyte comprising ZnCl2 0.4 mol/L,NH4Cl 5.0 mol/L,and H3BO3 0.4 mol/L facilitated the formation of Zn films with good adhesion on the FTO substrates by electrodeposition at a constant current density of 7.0 mA/cm2 for 300 s.After thermal oxidation,the Zn films were transformed completely into porous ZnO films with trace Sn as dopants which derived from the FTO substrates.Among all ZnO films studied,the one electrodeposited in an electrolyte containing 50 mg/L PEG had the largest thickness and porosity,and exhibited good photoelectrochemical performance.