As a vertically extended contact surface is formed between the said metallic pad and the dielectric layer in the dentritic structure, the contact surface and adhesion are increased.

• 由于在金属接线垫层及位于树枝状子结构中的介电层之间形成垂直延伸接触表面，因此扩大了接触面积而增强附着力；树枝状子结构在介电层的边缘部分不连续可有效截断而防止形成裂缝。