Browsing by Author "Lan, C. W."

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High Efficiency Silicon Solar Cells with Bilayer Passivation Structure
(2009)
Sun, W. C.
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Chang, W. L.
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Chen, C. H.
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Du, C. H.
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Wang, T. Y.
lThe effects of passivation on monocrystalline silicon solar cells were investigated. Al(2)O(3) and SiO(2) films, prepared by atomic layer deposition and thermal oxidation, respectively, were used as passivation layers. Passivation using a monolayer (SiO(2)) yielded a cell efficiency of 17.5%. However, the Al(2)O(3)/SiO(2) bilayer structure drastically increased cell efficiency to 20.1%. Quantum efficiency results revealed a significant improvement in the IR range, suggesting that bilayer passivation was effective on the back of a solar cell in providing a high energy conversion efficiency. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3194252] All rights reserved.
Three-dimensional buckling analyses of cracked functionally graded material plates via the MLS-Ritz method
(2019-01-01)
Huang, C. S.
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Lee, H. T.
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Li, P. Y.
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Hu, K. C.
;
Lan, C. W.
This study presents a novel three-dimensional elasticity-based numerical solution for buckling analysis of a functionally grated material (FGM) plate with a side crack or an internal crack, which is first shown in literature. The distributions of material properties are assumed to follow a power law through plate thickness. The buckling loads of cracked plates are found by the Ritz method with admissible functions constructed by the moving least squares (MLS) technique. The admissible functions are formed by multiplying a set of regular polynomials in the z coordinate with shape functions in x-y coordinates, established by MLS along with a set of basis functions consisting of regular polynomials and proposed crack functions. The proposed crack functions yields the correct singularity order for stresses at a crack front and shows the displacement and slope discontinuities across the crack, which enhances the ability of the Ritz method to handle problems with cracks. In order to validate the proposed solutions, convergence studies for buckling loads of cracked homogeneous plates are performed and a comparison is presented between the present results, previously published ones, and those obtained from commercial finite element software. The proposed approach is further applied to analyze the buckling of All Al2O3 FGM rectangular plates with side cracks and skewed rhombic plates with central internal cracks while considering the effects of material distributions, plate thickness, skew angles, crack lengths, inclination angles and positions, boundary conditions, and loading conditions on the buckling loads of these plates.