AI Article Synopsis
- Researchers successfully grew high-quality CdS/CdSxSe1-x axial heterostructure nanowires (NWHs) using a temperature-controlled chemical vapor deposition method, resulting in single-crystalline structures with sharp heterojunctions.
- Detailed microstructural and photoluminescence analyses confirmed the presence of two distinct band-edge emission bands from the adjacent semiconductors, indicating high-quality heterostructures.
- A photodetector built from a single nanowire exhibited exceptional performance, with metrics that surpass those using traditional single band gap nanostructures, suggesting a simpler approach to developing advanced nanowires for optoelectronic applications.
Article 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 × 10(2) A/W), faster response speed (rise ∼68 μs, decay ∼137 μs), higher Ion/Ioff ratio (10(5)), higher EQE (3.1 × 10(4) %), 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.
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| http://dx.doi.org/10.1021/acsnano.6b03458 | DOI Listing |
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