Kho Liep Chok

Title: Kho Liep Chok: Innovator in Semiconductor Technology

Introduction

Kho Liep Chok is a prominent inventor based in Singapore, known for his contributions to semiconductor technology. He holds a total of 5 patents that reflect his innovative approach to solving complex engineering challenges in the field.

Latest Patents

One of his latest patents is titled "Grain boundary blocking for stress migration and electromigration improvement in CU interconnects." This invention presents embodiments of a structure and method for forming a copper interconnect with a doped region near the top surface. The doped region contains implanted alloying elements that block grain boundaries, thereby reducing stress and electromigration. In one embodiment, a barrier layer is left over the intermetal dielectric layer during the alloying element implant, which is later removed through a planarization process. In another embodiment, the barrier layer is removed before the alloying element implant, and a hard mask prevents the alloying element from being implanted in the intermetal dielectric layer.

Another significant patent is the "Method of fabrication of a die oxide ring." This invention introduces a new design and method for implementing an 'oxide ring.' A conventional die is equipped with a guard ring or sealing ring that surrounds and isolates the active surface area of an individual semiconductor die. The 'oxide ring' surrounds the guard ring, forming a mechanical stress release buffer between the sawing paths of the die and the active surface area of the singulated individual semiconductor die.

Career Highlights

Kho Liep Chok has worked with notable companies in the semiconductor industry, including Chartered Semiconductor Manufacturing Ltd and Globalfoundries Singapore Pte. Ltd. His experience in these organizations has significantly contributed to his expertise and innovative capabilities.

Collaborations

Throughout his career, Kho has collaborated with talented individuals such as Fan Zhang and Tae Jong Lee. These collaborations have fostered a creative environment that has led to groundbreaking advancements in semiconductor technology.

Conclusion

Kho Liep Chok is a distinguished inventor whose work in semiconductor technology has made a lasting impact. His innovative patents and collaborations highlight his commitment to advancing the field.