On-Nanowire Axial Heterojunction Design for High-Performance Photodetectors

Pengfei Guo, Jinyou Xu, Ke Gong, Xia Shen, Yang Lu, Yang Qiu, Junqi Xu, Zhijun Zou, Chunlei Wang, Hailong Yan, Yongsong Luo, Anlian Pan, Han Zhang, Johnny C. Ho, Kin Man Yu

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

We report the growth of high-quality CdS/CdSxSe1-x axial heterostructure nanowires (NWHs) via a temperature-controlled chemical vapor deposition method. Microstructural characterizations revealed that these NWHs have a single-crystalline structure with abrupt heterojunctions. Local photoluminescence and mapping near the heterojunctions show only two separated narrow band-edge emission bands from the two different adjacent semiconductors, further demonstrating the high-quality of these heterostructures. Moreover, the photodetector based on the single NWH shows a performance (higher responsivity (1.18 × 102 A/W), faster response speed (rise ∼68 μs, decay ∼137 μs), higher Ion/Ioff ratio (105), higher EQE (3.1 × 104 %), and broader detection range (350-650 nm)) at room temperature superior to that of photodetectors based on single band gap nanostructures. This work suggests a much simpler route to achieve superior NWHs for applications in optoelectronic devices.

Original languageEnglish
Pages (from-to)8474-8481
Number of pages8
JournalACS nano
Volume10
Issue number9
DOIs
Publication statusPublished - Sep 27 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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