Strong correlation of the growth mode and electrical properties of BiCuSeO single crystals with growth temperature

Literature Information

Publication Date 2015-07-07
DOI 10.1039/C5CE01215E
Impact Factor 3.545
Authors

Yang-Yang Lv, Bin-Bin Zhang, Fan Zhang, Shuhua Yao, Y. B. Chen, Jian Zhou, Shan-Tao Zhang, Zheng-Bin Gu, Yan-Feng Chen


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Abstract

In this paper, BiCuSeO single crystals are successfully grown by a flux method at different growth temperatures (690 °C, 730 °C and 775 °C). The crystal surface morphology, microstructure, chemical composition and electrical properties are systematically characterized. By changing the growth temperature, the growth mechanism evolution, from dislocation-driven spiral growth mode to two-dimensional layer-by-layer mode, is observed due to the different growth supersaturations. Simultaneously, the temperature-dependent resistance confirms the electrical property changes from semiconductor to metal. Chemical analysis proves that BiCuSeO crystals grown at higher temperatures (730 °C and 775 °C) are slightly non-stoichiometric. The present results demonstrate the possibility of modulating the crystal morphology and electrical properties of BiCuSeO by controlling the supersaturation. This method may be applicable to similar compounds (BiCuOCh (Ch = S, Te)).

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CrystEngComm

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CrystEngComm is the forum for the design and understanding of crystalline materials. We welcome studies on the investigation of molecular behaviour within crystals, control of nucleation and crystal growth, engineering of crystal structures, and construction of crystalline materials with tuneable properties and functions. We publish hypothesis-driven research into… how crystal design affects thermodynamics, phase transitional behaviours, polymorphism, morphology control, solid state reactivity (crystal-crystal solution-crystal, and gas-crystal reactions), optoelectronics, ferroelectric materials, non-linear optics, molecular and bulk magnetism, conductivity and quantum computing, catalysis, absorption and desorption, and mechanical properties. Using Techniques and methods including… Single crystal and powder X-ray, electron, and neutron diffraction, solid-state spectroscopy, spectrometry, and microscopy, modelling and data mining, and empirical, semi-empirical and ab-initio theoretical evaluations. On crystalline and solid-state materials. We particularly welcome work on MOFs, coordination polymers, nanocrystals, host-guest and multi-component molecular materials. We also accept work on peptides and liquid crystals. All papers should involve the use or development of a design or optimisation strategy. Routine structural reports or crystal morphology descriptions, even when combined with an analysis of properties or potential applications, are generally considered to be outside the scope of the journal and are unlikely to be accepted.

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