News Column

Researchers from Hong Kong University of Science and Technology Describe Findings in Nanostructures

June 4, 2014

By a News Reporter-Staff News Editor at Electronics Newsweekly -- Current study results on Nanostructures have been published. According to news reporting from Hong Kong, People's Republic of China, by VerticalNews journalists, research stated, "Planar substrate supported semiconductor quantum well (QW) structures are not amenable to manipulation in miniature devices, while free-standing QW nanostructures, e.g., ultrathin nanosheets and nanoribbons, suffer from mechanical and environmental instability. Therefore, it is tempting to fashion high-quality QW structures on anisotropic and mechanically robust supporting nanostructures such as nanowires and nanoplates."

The news correspondents obtained a quote from the research from the Hong Kong University of Science and Technology, "Herein, we report a solution quasi-heteroepitaxial route for growing a barrier-confined quasi-QW structure (ZnSe/CdSe/ZnSe) on the supporting arms of ZnO nanotetrapods, which have a 1D nanowire structure, through the combination of ion exchange and successive deposition assembly. This resulted in highly crystalline and highly oriented quasi-QWs along the whole axial direction of the arms of the nanotetrapod because a transition buffer layer (ZnxCd1-xSe) was formed and in turn reduced the lattice mismatch and surface defects. Significantly, such a barrier-confined QW emits excitonic light similar to 17 times stronger than the heterojunction (HJ)-type structure (ZnSe/CdSe, HJ) at the single-particle level. Time-resolved photoluminescence from ensemble QWs exhibits a lifetime of 10 ns, contrasting sharply with similar to 300 ps for the control HJ sample. Single-particle PL and Raman spectra suggest that the barrier layer of QW has completely removed the surface trap states on the HJ and restored or upgraded the photoelectric properties of the semiconductor layer. Therefore, this deliberate heteroepitaxial growth protocol on the supporting nanotetrapod has realized a several micrometer long QW structure with high mechanical robustness and high photoelectric quality."

According to the news reporters, the research concluded: "We envision that such QWs integrated on 1D nanostructures will largely improve the performance of solar cells and bioprobes, among others."

For more information on this research see: Solution-Processed, Barrier-Confined, and 1D Nanostructure Supported Quasi-quantum Well with Large Photoluminescence Enhancement. ACS Nano, 2014;8(4):3771-3780. ACS Nano can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; ACS Nano -

Our news journalists report that additional information may be obtained by contacting K.Y. Yan, Hong Kong University of Science & Technology, William Mong Inst Nano Sci & Technol, Dept. of Phys, Kowloon, Hong Kong, People's Republic of China. Additional authors for this research include L.X. Zhang, Q. Kuang, Z.H. Wei, Y. Yi, J.N. Wang and S.H. Yang.

Keywords for this news article include: Asia, Hong Kong, Electronics, Semiconductor, Nanostructural, Nanostructures, Nanotechnology, Emerging Technologies, People's Republic of China

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Source: Electronics Newsweekly

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