摘要
为了提高CdS光敏层在TiO_2一维纳米棒阵列中的填充率,在TiO_2种子层的基础上,采用水热法于FTO导电玻璃表面生长了棒长较短、棒间距较大的低密度TiO_2一维纳米棒阵列膜,通过化学浴沉积在TiO_2纳米棒表面包覆CdS种子层,以此为基底采用水热法于TiO_2一维纳米阵列中生长CdS光敏层。采用SEM,XRD及紫外-可见吸收光谱对不同CdS水热生长时间的TiO_2/CdS复合膜结构进行了表征,并对其光电性能进行了研究。结果表明,低密度TiO_2纳米棒阵列有利于CdS生长液在阵列中渗入形成完全包覆的CdS种子层,CdS光敏层通过水热过程在整个TiO_2纳米棒表面均匀生长,逐渐形成CdS对TiO_2纳米棒阵列的完全填充和包覆,并在阵列顶端形成由CdS纳米短棒组成的花状修饰层;CdS的修饰将TiO_2一维纳米阵列膜的光吸收拓展至可见光区,水热生长7h所得到的TiO_2/CdS复合膜具有最高光电流。所制备的CdS修饰低密度TiO_2纳米棒复合膜在太阳电池器件中具有很好的应用前景。
In order to increase the filling ratio of CdS photosensitized layer into the TiO2 array,a low-density TiO2 nanorod array with short-length rods and large rod-interval is prepared based on the TiO 2 seed layer-coated FTO conductive glass through hydrothermal process.CdS seed layer is covered onto the TiO2 nanorod by chemical bath deposition.Then CdS photosensitized layer is grown in the TiO2 nanorod array via hydrothermal approach.SEM,XRD,UV-Vis absorption spectra are employed to characterize the TiO2/CdS composite films with different hydrothermal time of CdS.The photoelectrochemical properties of the TiO2/CdS composite film are also studied.The results indicate that the low-density of the TiO2 nanorod array could facilitate the infiltration of the CdS growth solution into the TiO2 array to form the perfect coverage with CdS seed layers.CdS photosensitized layers are homogeneously grown on the whole TiO2 nanorods and gradually filled in the TiO2 array through hydrothermal process.Meanwhile,flower-like CdS modified layers composed with short-length rods are formed at the top of composite film array.The light absorption of the TiO2 nanorod array is extended to the visible region with the CdS modification.The photocurrent of the TiO2/CdS composite film is obtained via 7 h hydrothermal growth of CdS layer.The excellent photoelctrochemical performance of the composite film of CdS modified TiO2 nanorod array with low density reveales its application prospect in solar cells.
作者
孙宝
苏子亭
张赛
郝彦忠
裴娟
李英品
SUN Bao;SU Ziting;ZHANG Sai;HAO Yanzhong;PEI Juan;LI Yingpin(School of Science,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China;School of Chemical and Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China)
出处
《河北科技大学学报》
CAS
2018年第5期470-476,共7页
Journal of Hebei University of Science and Technology
基金
国家自然科学基金(21173065
21603053)
河北省自然科学基金(B2014208062
B2014208066)
河北省科技计划项目(13214413)
河北科技大学博士启动基金(000691
010087)
关键词
电化学
低密度TiO2纳米棒阵列
短棒状CdS
水热法
光电性能
electrochemistry
TiO2 nanorod array with low density
short rod-like CdS
hydrothermal process
photoelctrochemical property
作者简介
孙宝(1975—),女,河北深泽人,副教授,博士,主要从事半导体纳米材料光电性能方面的研究;通信作者:郝彦忠,教授。E-mail:yzhao@hebust.edu.cn。
