Annealing of the superlong CdS nanotubes for enhanced performance in fully nanostructured photodetector

• Published in: Materials letters Vol. 161; pp. 751 - 754
• Main Authors: An, Qinwei, Meng, Xianquan, Liu, Guangrui, Hong, Lifang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.12.2015
• Subjects: Annealing; CdS nanotubes; Crystal structure; Defects; Devices; Electrodes; Nanostructure; Nanotubes; Photodetectors; Physical vapor deposition; Sensors; Silver; CdS nanotubes; Physical vapor deposition; Sensors; Crystal structure; Defects
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2015.09.083

The superlong single-crystalline CdS nanotubes have been prepared via a physical evaporation process. The effect of annealing process on the structural and photoluminescence (PL) characterizations are investigated, which plays important roles in the improvement of the crystalline quality and the optical property. A fully nanostructured photodetector with CdS NTs as active layer and Ag nanowires as electrodes have been fabricated and characterized. Compared with the performance of as-grown NTs-based photodetector, the annealed NTs-based device provides about 2–3 orders of magnitude decrease of dark current in air and about 30 times increase of photocurrent and decrease of the response time in vacuum, which are dependent on the high crystalline quality and defect-free property in annealed sample. •Superlong single-crystalline CdS nanotubes were synthesized by physical evaporation process.•A sensitive photodetector was developed using CdS nanotubes.•The effects of annealing on crystal structure and optical properties of nanotubes were investigated.•Photodetector performance was further enhanced through the annealing process.