Hong Kong Applied Science and Technology Research Institute Company, Limited

Li Min Lin

Yong Cai

Ka Wah Chan

Sheng Mei Zheng

The present invention provides a method of fabricating vertical LED structures in which the substrate used for epitaxial layer growth is removed through polishing. The polishing technique used in an exemplary embodiment is chemical mechanical polishing using polish stops to provide a sufficiently level plane. Polish stops are provided in the multilayer structure before polishing the surface, the hardness of the polish stop material being greater than the hardness of the material that needs to be removed. Consequently, vertical LEDs can be produced at a lower cost and higher yield compared to either laser lift-off or conventional polishing. Exemplary vertical LEDs are GaN LEDs. The polish stops may be removed by saw dicing, laser dicing or plasma etching.

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Hong Kong, China

Li Min Lin