Research on Improvement of Endurance against Hydrogen for Multi-Layered Electrode in Flexible Module Like Solar Cell Structure

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Deformation and fracture characteristics of an interface, which is commonly encountered in a multi-layered structure of an electrode of a solar cell, in a BCC metal (alpha-Fe) under hydrogen diffusion are investigated by the molecular dynamics (MD) analysis. Influence of strain, existence of interface and hydrogen concentration on diffusion of hydrogen from a free surface are studied. Two types of Fe-H potentials gave different results. By comparing these results with a physical H diffusion mechanism, a new model of H diffusion combining two Fe-H potentials, was developed. In this model, deformation and fracture of an interface are relatively promoted than the previous models using a single Fe-H potential. It is shown major factors of interface fracture are applied strain and hydrogen concentration. So, to improve strength of an interface, it is suggested to reduce residual stresses during lamination and to coat a moisture proof film around the electrode.