The heteroj unction composed of Cu2O film and ZnO nanorod arrays was fabricated by a two-step method.ZnO nanorod arrays were firstly grown on fluorine-doped SnO2 conducting glass (FTO) by chemical solution deposition method,then Cu2O film was deposited on ZnO nanorod arrays to form heteroj unction by sequential hydrothermal method.The morphology and crystalline phase of obtained heteroj unction were characterized by scanning electron microscope and X-ray diffraction.ZnO nanorod arrays had very high purity with a (002) orientation and the length of the nanorod was around 1μm.The Cu2O film with a thickness of 1.5μm and a preferential (111) orientation grew on the ZnO nanorod arrays.Compared with the ZnO nanorod arrays,Cu2O/ZnO heteroj unction showed increased absorption intensity in the visible region.The Cu2O/ ZnO heteroj unction solar cells was observed under Sun illumination (AM 1.5,100 mW/cm2 ) with the short circuit current density (Jsc) of 7.8mA/cm2,the open circuit voltage (Voc) of 0.36V,the filling factor (FF) of 0.31,and photovoltaic conversion effciency (PCE) of 0.86%.%通过两步法制备了由ZnO纳米棒阵列和Cu2O薄膜组成的异质结.首先利用低温湿化学法在掺氟的SnO2导电玻璃(比较FTO)上生长ZnO纳米棒阵列,然后在ZnO纳米棒阵列上通过水热法继续生长Cu2O薄膜,形成ZnO/Cu2O异质结.通过扫描电子显微镜和X射线衍射仪的表征结果得知,ZnO纳米棒阵列具有很好的c轴取向性,其长度为1μm;而Cu2O薄膜的厚度为1.5 μm,其(111)面优先沿ZnO的(002)面外延生长.与ZnO纳米棒阵列相比,ZnO/Cu2O异质结在可见光范围内吸收强度明显增强.在模拟太阳光照射下(AM 1.5,100 mW/cm2),由ZnO/Cu2O异质结构成的太阳能电池器件的开路电压为0.36 V,短路电流密度为7.8 mA/cm2,对应的填充因子为31％,光电转换效率为0.86％.
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