通过两步法合成PbS量子点(QDs)修饰ZnO纳米片复合膜.首先利用电化学法在掺氟的SnO2导电玻璃(FTO)上生长ZnO纳米片,然后在ZnO纳米片上通过逐次化学浴法沉积PbS量子点形成PbS/ZnO复合膜.利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)详细表征了样品的表面形貌和晶体结构,并研究了PbS/ZnO复合膜作为量子点敏化太阳能电池光阳极的紫外-可见吸收谱、光电化学性能和表面光电压谱.对比ZnO纳米片经PbS量子点修饰前后,发现PbS量子点修饰后光阳极的光吸收和光伏响应均从紫外区拓宽到了可见光区,同时光电化学性能有了显著提高,短路电流密度从敏化前的0.1 mA/cm2增加到0.7 mA/cm2,效率由0.04％增加到0.57％.与单一ZnO纳米片相比,PbS/ZnO复合膜的表面光伏响应强度明显增强,说明PbS与ZnO之间形成了有利于光生电荷分离的异质结,从而导致了PbS/ZnO复合膜光电性能的增加.
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