Composition-gradient ZnO/Zn(S, O) heterostructure nanorod arrays and their cathodoluminescence. (1st March 2019)

• Record Type: Journal Article
• Authors: Liu, B.Y.; Bi, X.G.; Xiong, C.M.; Shang, L.Y.
• Is Part Of: Materials science in semiconductor processing. Volume 91(2019)
• Page Start: 362
• Page End: 366
• Publication Date: 2019-03-01
• Subjects: ZnO -- ZnS -- Synthesis -- Heterostructures -- Cathodoluminescence; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2018.12.002
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: Well-aligned ZnO/Zn(S, O) heterostructure nanorods have been synthesized through a well-designed chemical vapor deposition synthesis process. The as-synthesized ZnO/Zn(S, O) heterostructures exhibit a single crystal characteristic and a transitive interface with obvious composition gradient. X-ray Energy dispersive spectrometer (EDS) analysis demonstrates that ZnS-phase is rich in the nanorod bottom during the initial nucleation process and the S element content has a drastic decrease along the heterostructure nanorod from the bottom to the top, while O element is spatially detected in the whole rod. Room-temperature cathodoluminescence measurements verify two UV emissions at 330 nm and 385 nm for respective Zn(S, O) and ZnO phases with a strong defect-related emission band in visible range. Finally, the growth mechanism and optical emissions of ZnO/Zn(S, O) heterostructure nanorods are discussed. Graphical abstract: Semiconductor nanostructures with good alignment and tuneable composition have significant applications in optoelectronic nanodevices. By controlling the oxygen content during reaction process, well-aligned ZnO/ZnS heterostructure nanorods with gradient composition in the interface can be obtained. Room-temperature cathodoluminescence measurement shows that the ZnO/ZnS heterostructure nanorods have a strong visible emission with two separated characteristic band emissions originating from individual ZnO and ZnS phases, respectively.