This inventor holds 4 USPTO granted patents. Top assignee: Hong Kong Applied Science and Technology Research Institute. Active years: 2011-2012.
Company Filing History:
Years Active: 2011-2012
Title: Innovations of Ka Wah Chan in Light Emitting Diodes
Introduction
Ka Wah Chan is a prominent inventor based in Hong Kong, CN. He has made significant contributions to the field of light emitting diodes (LEDs) with a total of 4 patents to his name. His work focuses on improving the efficiency and cost-effectiveness of LED technology.
Latest Patents
One of his latest patents is titled "Methods for making quasi-vertical light emitting diodes." This invention outlines a method for creating quasi-vertical light emitting devices by growing semiconductor layers on a growth substrate. The process includes etching the semiconductor layers to produce device isolation trenches, which form separable semiconductor devices and holes. Blind holes are drilled in the substrate at the location of each hole in the semiconductor layers. The drilling defines blind hole walls and a blind hole end in each of the blind holes. N-semiconductor metal is deposited in each of the blind holes, and an n-electrode contact is formed by plating each hole with n-electrode metal connected to the n-semiconductor metal. The substrate is then thinned to expose the n-electrode metal as an n-electrode, and bonding metal is deposited for packaging.
Another notable patent is "Optimization of polishing stop design." This invention provides a method for fabricating vertical LED structures by removing the substrate used for epitaxial layer growth through polishing. The polishing technique involves chemical mechanical polishing using polish stops to achieve a sufficiently level plane. Polish stops are integrated into the multilayer structure before polishing, with the hardness of the polish stop material being greater than that of the material to be removed. This innovation allows for the production of vertical LEDs at a lower cost and higher yield compared to traditional methods.
Career Highlights
Ka Wah Chan is affiliated with the Hong Kong Applied Science and Technology Research Institute, where he continues to advance LED technology. His work has been instrumental in enhancing the performance and manufacturability of LED devices.
Collaborations
He collaborates with notable colleagues such as Hung Shen Chu and Yong Cai, contributing to a dynamic research environment focused on innovative solutions in semiconductor technology.
Conclusion
Ka Wah Chan's contributions to the field of light emitting diodes exemplify the impact of innovative thinking in technology. His patents reflect a commitment to improving efficiency and reducing costs in LED manufacturing.