Fabrication of patterned CdS/TiO2 heterojunction by wettability template-assisted electrodeposition

• Main Authors: Lai, Yuekun, Lin, Zequan, Chen, Zhong, Huang, Jianying, Lin, Changjian
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Materials::Microelectronics and semiconductor materials
• Online Access: https://hdl.handle.net/10356/95018; http://hdl.handle.net/10220/9389
• Institution: Nanyang Technological University

A wettability template-assisted process was applied to selectively deposit cadmium sulfide (CdS) nanospheres on TiO2 nanotube layers to form uniformly coupled CdS/TiO2 semiconductor heterojunction micropatterns. The effect of deposition time on the size and morphology of the as-prepared CdS/TiO2 array patterns was investigated. It is shown that the CdS nanocrystals with a highly ordered, hierarchically porous structure in nano-micro dual scales could be selectively grown within the superhydrophilic regions. The patterned CdS/TiO2 heterojunctions have demonstrated enhanced photo-response under both UV and visible light irradiation. This novel template patterning technique, which is based on wettability contrast, can be applied to a broad range of technological areas, such as sensor arrays and optoelectronic devices.