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- 저자 : Xingao Li (검색결과 2 건)
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Preparation and characterization of Mn doped copper nitride films with high photocurrent response
Aiai Yu,Ruiyuan Hu,Wei Liu,Rui Zhang,Jian Zhang,Yong Pu,Liang Chu,Jianping Yang,Xingao Li 한국물리학회 2018 Current Applied Physics Vol.18 No.11
The Mn-doped copper nitride (Cu3N) films with Mn concentration of 2.0 at. % have high crystallinity and uniform surface morphology. We found that the as-synthesized Mn-doped Cu3N films show suitable optical absorption in the visible region and the band gap is ∼1.48 eV. A simple photodetector based on Mn doped Cu3N films was firstly fabricated via magnetron sputtering method. The fabricated device with doping of Mn demonstrated high photocurrent response and fast response shorter than 0.1 s both for rise and decay time superior to the pure Cu3N. Furthermore, the energy levels of Mn-doped Cu3N matched well with ITO and Ag electrode. The excellent photoelectric properties reflect a good balance between sensitivities and response rate. Our investigation reveals the excellent potential of Mn-doped Cu3N films for application of photodetectors.
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Xin Gao,Shunlong Li 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.6
Failure of a redundant long-span bridge is often described by innumerable failure modes, which make the structural system reliability analysis become a computationally intractable work. In this paper, an innovative procedure is proposed to efficiently identify the dominant failure modes and quantify the structural reliability for a long-span bridge system. The procedure is programmed by ANSYS and MATLAB. Considering the correlation between failure paths, a new branch and bound operation criteria is applied to the traditional stage critical strength branch and bound algorithm. Computational effort can be saved by ignoring the redundant failure paths as early as possible. The reliability of dominant failure mode is computed by FORM, since the limit state function of failure mode can be expressed by the final stage critical strength. PNET method and FORM for system are suggested to be the suitable calculation method for the bridge system reliability. By applying the procedure to a CFST arch bridge, the proposed method is demonstrated suitable to the system reliability analysis for long-span bridge structure.
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