Polarization fields in GaN/AlN nanowire heterostructures studied by Off axis holography

In this work, we present an off-axis holography study of GaN/AlN heterostructured nanowires grown by plasma-assisted molecular-beam epitaxy. We discuss the sample preparation of nanowire samples for electron holography and combine potential profiles obtained using holography with theoretical calculations of the projected potential in order to gain understanding of the potential distribution in these nanostructures. The effects of surface states are discusse

Intrinsic limits governing MBE growth of Ga-assisted GaAs nanowires on Si(111)

Diffusion-enhanced and desorption-limited growth regimes of Ga-assisted GaAs nanowires were identified. In the latter regime, the number of vertical NWs with a narrow length distribution was increased by raising the growth temperature. The maximum axial growth rate; which can be quantified by the supplied rate of As atoms, is achieved when a dynamical equilibrium state is maintained in Ga droplets i.e. the number of impinging As atoms on the droplet surface is equivalent to that of direct deposited Ga atoms combining with the diffusing ones. The contribution of Ga diffusion to the wire growth was evidenced by the diameter-dependent NW axial growth rate

Environmental sensitivity of n-i-n and undoped single GaN nanowire photodetectors

In this work, we compare the photodetector performance of single defect-free undoped and n-in GaN nanowires (NWs). In vacuum, undoped NWs present a responsivity increment, nonlinearities and persistent photoconductivity effects (~ 100 s). Their unpinned Fermi level at the m-plane NW sidewalls enhances the surface states role in the photodetection dynamics. Air adsorbed oxygen accelerates the carrier dynamics at the price of reducing the photoresponse. In contrast, in n-i-n NWs, the Fermi level pinning at the contact regions limits the photoinduced sweep of the surface band bending, and hence reduces the environment sensitivity and prevents persistent effects even in vacuum

E-Testing Construction Support System with some Prediction Tools

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Development of Potential in Value-Added Marketing Strategy Management and Application for Durian Agro-Community Enterprise in Deep South Provinces

The purposes of this study were to develop a management system for increasing the competitiveness of Yala’s agro-community enterprises, and to develop the potential of agro-community enterprises by adding value to the market share of durian via application of the concept of integration through the supply chain and value chain. The methodology followed a participatory action research approach with a sample group consisting of three durian-related enterprises, namely the Community Enterprise of Ban Batoo Puteh Quality Development, Yala Agricultural Marketing Co-Operative Limited, and the Fruit Processing Group of the community enterprise in Bannang Sata district. Data were collected via interview and group discussion, while data analysis involved data explanation and description. The results revealed that the development of a management system for adding to the competitiveness of Yala’s agro-community enterprises consists of the development of organizational structure, the member system, and a development plan management system. It was also found that the development of the potential of agro-community enterprise relates to adding value to the market share of durian by applying the concept of integration through the supply chain and value chain. This consisted of product development, marketing strategies, enhancing management efficiency, and building networks