氧化锌纳米棒形貌对ZnO/Cu2O异质结太阳能电池光伏性能的影响

采用电化学沉积法制备了ZnO纳米棒,首先讨论了电化学沉积参数对氧化锌(ZnO)纳米棒形貌的影响,并对不同长度ZnO纳米棒的光吸收和反射等性质进行了研究.实验发现沉积时间是影响纳米棒长度、直径的重要因素,ZnO纳米棒的微观形貌对其光学性质有重要影响.然后以氧化锌纳米棒为n型材料,以氧化亚铜为p型材料,通过电化学沉积法构筑了ZnO/Cu2O异质结太阳能电池,并测试了其光伏性能,研究表明增长纳米棒阵列的长度使得开路电压、短路电流密度及光电转换效率等性能得到提升.最后,综合分析了氧化锌纳米棒形貌与所组装电池的性能之间的关系,发现调控氧化锌纳米棒的形貌是提高ZnO/Cu2O异质结太阳能电池光伏性能的有效途径.

Influence of ZnO Nanorods Morphology on the Photovoltaic Properties of ZnO/Cu2O Heterostructural Solar Cells

ZnO nanorods were prepared by electrochemical deposition(ECD).The influence of ECD parameters on the morphologies of ZnO nanorods was studied and optical properties of the ZnO nanorods were measured with optical absorption and specular reflection spectra.It is found that deposition time has significant influence on the length and diameter of ZnO nanorods which is also proved by the optical measurements.ZnO/Cu2O heterostructural solar cells were constructed by ECD with n-type ZnO nanowires and p-type Cu2O films and their photovoltaic characteristics such as open-circuit voltage,short-circuit current density and efficiency were measured.With the increase of nanorods’ length,the photovoltaic properties of ZnO/Cu2O solar cells are enhanced.Finally,the relation between the solar cell performance and the morphologies of ZnO nanorods are discussed.It is indicates that,by increasing the length of nanorods,the light scattering is enhanced,which improves the electronic collection efficiency and photon utilization rate,and accordingly,the performance of solar cells.