title: High-performance ultraviolet photodetectors based on CdS/CdS:SnS2 superlattice nanowires.
abstract: CdS heterostructure nanomaterials are attractive for their potential applications in integrated optoelectronic devices. Herein, the high-quality CdS/CdS:SnS2 superlattice nanowires were synthesized through a micro-environmental controlled co-evaporation technique, which shows periodic emission properties and that their structures are periodic and alternating. For the first time, we demonstrate the fabrication of high-performance ultraviolet photodetectors using unique CdS/CdS:SnS2 superlattice nanowires. The optoelectronic properties of the photodetectors were studied and compared to those devices based on pure CdS nanowires. The as-fabricated photodetectors (under 365 nm) based on CdS/CdS:SnS2 superlattice nanowires showed a high photocurrent to dark current ratio of 10(5), a large photoresponsivity of 2.5 × 10(3) A W(-1), a fast response time of 10 ms and an excellent external quantum efficiency of 8.6 × 10(5) at room temperature, which shows better performance than pure CdS nanowires photodetectors. The results indicate that CdS/CdS:SnS2 superlattice nanowires are very promising potential candidates in nanoscale electronic and optoelectronic devices.
authors.affiliation: Institute of Super-microstructure and Ultrafast Process in Advanced Materials (ISUPAM), School of Physics and Electronics, Central South University, Changsha, Hunan 410083, PR China. gzdai2011@csu.edu.cn jiasun@csu.edu.cn.
authors.forename: Guangyang
authors.initials: G
authors.lastname: Gou
authors.forename: Guozhang
authors.initials: G
authors.lastname: Dai
authors.forename: Chuan
authors.initials: C
authors.lastname: Qian
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Liu
authors.forename: Yan
authors.initials: Y
authors.lastname: Fu
authors.forename: Zhenyang
authors.initials: Z
authors.lastname: Tian
authors.forename: Yinke
authors.initials: Y
authors.lastname: He
authors.forename: Lingan
authors.initials: L
authors.lastname: Kong
authors.forename: Junliang
authors.initials: J
authors.lastname: Yang
authors.forename: Jia
authors.initials: J
authors.lastname: Sun
authors.forename: Yongli
authors.initials: Y
authors.lastname: Gao