摘要
利用水热反应制备了CuS/TiO2纳米管异质结阵列,采用场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)和X射线衍射谱(XRD)等手段表征了异质结阵列的表面形貌和晶体结构.电流-电压曲线结果表明,CuS/TiO2纳米管异质结阵列具有明显的整流效应.根据表面光电压谱和相位谱,在376～600 nm之间,CuS/TiO2纳米管异质结阵列表现为p型半导体特征,电子在表面聚集;在300～376 nm之间表现为n型半导体特征,空穴在表面聚集;在376 nm处异质结阵列的表面光伏响应为零.CuS/TiO2和CuS/ITO之间界面电场的不同导致异质结在不同波长范围内表面电荷聚集的差异.光电化学性能测试发现,以CuS/TiO2纳米管异质结阵列为光阳极组成的光化学太阳电池,在大气质量AM 1.5G,100 mW/cm2标准光强作用下具有0.4%的光电转换能力.
CuS/TiO2 nanotube heterojunction arrays were prepared by hydrothermal reaction.The surface morphology and crystalline phase of heterojunction arrays were characterized by field emission scanning electron microscopy（FESEM）,transmission electron microscopy（TEM） and X-ray diffraction（XRD）.The current-voltage curve of CuS/TiO2 nanotube heterojunction arrays reveals an obvious rectifying behavior.According to the results of surface photovoltage spectrum（SPS） and phase spectrum（PS）,CuS/TiO2 nanotube heterojunction arrays show p-type semiconductor character and electrons aggregate at the surface in 376—600 nm,and n-type semiconductor character and holes aggregate at the surface in 300—376 nm.The surface photovoltage response is zero at 376 nm.The reason for difference aggregation properties in different wavelengths of heterojunction arrays is the competition result between interfacial electric filed of CuS/TiO2 and CuS/ITO.The photoelectrochemical property of CuS/TiO2 nanotube heterojunction arrays-base photoelectrochemical cell shows that 0.4% of photoelectricity conversion efficiency is achieved under 100 mW/cm2 simulated AM 1.5G sunlight.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第2期423-428,共6页
Chemical Journal of Chinese Universities
基金
中央高校基本科研业务费专项资金(批准号:SWJTU12CX017,SWJTU11ZT31,SWJTU11ZT16)
教育部超导磁悬浮列车创新团队项目(批准号:IRT0751)
国际热核聚变实验堆(ITER)计划专项(批准号:2011GB112001)
教育部博士点基金(批准号:SRDP200806130023)
四川省科技计划资助项目(批准号:2011JY0031,2011JY0130)资助
关键词
CUS
TiO2纳米管异质结阵列
表面光电压谱
相位谱
界面电场
光电化学性能
CuS/TiO2 nanotube heterojunction array
Surface photovoltage spectrum
Phase spectrum
Interfacial electric field
Photoelectrochemical property
