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Effects of sn-doping on morphology and optical properties of CdTe polycrystalline films

Journal of Semiconductors 2009年第11期30卷 10-13页

作者：李锦杨林钰简基康邹华孙言飞 College of Physics Science and Technology Xinjiang University

sn-doped CdTe polycrystalline films were successfully deposited on ITO glass substrates by close space sublimation. The effects of sn-doping on the microstructure, surface morphology, and optical properties of polycrys- talline films were studied using X-ray diffraction, scanning electron microscopy, and ultraviolet-visible spectrophotometry, respectively. The results show that the lower molar ratio of sn and CdTe conduces to a strongly preferential orientation of （111） in films and a larger grain size, which indicates that the crystallinity of films can be improved by appropriate sn-doping. As the molar ratio of sn and CdTe increases, the preferential orientation of （111） in films becomes weaker, the grain size becomes smaller, and the crystal boundary becomes indistinct, which indicates that the crystallization growth of films is incomplete. However, as the sn content increases, optical absorption becomes stronger in the visible region. In summary, a strongly preferential orientation of （111） in films and a larger grain size can be obtained by appropriate sn-doping （molar ratio of sn ： CdTe = 0.06 ： 1）, while the film retains a relatively high optical absorption in the visible region. However, sn-doping has no obvious influence on the energy gap of CdTe films.

关键词： CdTe polycrystalline films sn-doping preferential orientation growth morphology optical properties close space sublimation

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Surface modification of CeO_(2-x) nanorods with sn doping for enhanced nitrogen electroreduction

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Journal of Energy Chemistry 2023年第12期87卷 400-407,I0011页

作者： Yuhang Xiao Xiaohong Tan Yingying Guo Jianpo Chen Weidong He Hao Cui Chengxin Wang School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275GuangdongChina The Key Laboratory of Low-Carbon Chemistry&Energy Conservation of Guangdong Province Sun Yat-sen UniversityGuangzhou 510275GuangdongChina

While the electrochemical nitrogen reduction reaction(NRR) represents a prospective blueprint for environmentally renewable ammonia generation,it has yet to overcome the limitations of weak activity and inferior *** this regard,surface modification tactic was constructed to markedly enhance the activity and selectivity via introducing sn atoms into the surface of defective cerium oxide(denoted as sn-CeO_(2-x)) as the active and robust electrocatalyst for NRR under benign *** introduction of sn atoms in CeO_(2-x)can not only inhibit the HER activity of the catalyst but also modulate the electronic structure of ceria and optimize N-Ce interaction,thus enhancing NRR activity and *** all previous CeO_(2)-based NRR catalysts,this catalyst has demonstrated an ammonia yield rate of 41.1 μg mg_(cat)^(-1) h^(-1) and an exceptional Faradic efficiency of 35.3%.This work presents a viable approach for the development of advanced NRR electrocatalysts.

关键词： Ceria-based materials Nitrogen reduction reaction sn-doping Surface modification Electrocatalysis

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Improving rate performances of Li-rich layered oxide by the co-doping of sn and K ions

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Journal of Materiomics 2019年第2期5卷 149-155页

作者： Bao Li Xinbo Wang Yibo Gao Bao Wang Jinxu Qiu Xu Cheng Dongmei Dai School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiangHenan453007China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China

The specific capacities and power performances of conventional cathode materials are still needed to improve in order to meet the demand for electrical ***-rich layered oxide delivers a high specific capacity,but poor rate *** doping is an effective way to address this challenge due to the expanded crystal *** a single ion substitution in the literature,here Li-rich layered oxides were doped by sn and K to achieve the favorite rate performance,where sn and K were assumed to replace transition metal ion and Li ion,*** indicate the co-doped samples result in an increasing capacity retention by more than 40%from 107.9(contrast sample)to 151.5 mAh g^(-1)(co-doped sample)at 10 *** impedance spectroscopy(EIS)and calculated diffusion coefficient of Li^(+) also confirmed the favorite rate performances for co-doped *** results of Rietveld structure refinement,we proposed that the reason for rate performances comes from the enlarged crystal lattices,which provides a smooth diffusion tunnel for Lithium ions during the charge/discharge *** as-adopted method provides a possibility to achieve the improved rate performances by co-doping big-size ions at the different crystal sites.

关键词： Li-rich layered oxide Rate performance sn-doping K-doping Crystal lattice Solid state reaction

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