This inventor holds 2 USPTO granted patents. Top assignees: International Business Machines Corporation, Siemens Aktiengesellschaft. Active years: 1998-1999.
Company Filing History:
2 out of 166,264 
2 out of 30,859 
Years Active: 1998-1999
Title: Herb Lei Ho: Innovator in DRAM Technology
Introduction
Herb Lei Ho is a notable inventor based in Washingtonville, NY (US). He has made significant contributions to the field of semiconductor technology, particularly in dynamic random-access memory (DRAM) systems. With a total of 2 patents to his name, his work has had a lasting impact on the industry.
Latest Patents
One of Herb Lei Ho's latest patents is focused on nitride cap formation in a DRAM trench capacitor. This innovative method involves creating an oxygen-impervious barrier on the oxide collar of a trench capacitor in a DRAM cell. The process begins with etching a shallow trench into the oxide collar that surrounds the polysilicon trench fill. This trench is isolated from the single crystal semiconducting substrate material of the DRAM cell to a depth that is at least equal to or larger than the width of the oxide collar. A nitride layer, with a thickness equal to or greater than half of the width of the oxide collar, is then deposited on the top surface of the freshly excavated oxide collar. This ensures that the trench is completely filled with the nitride layer, covering the entire surfaces of the substrate and polysilicon trench fill. The newly formed nitride layer is selectively overetched to remove it from the substrate and polysilicon trench fill surfaces while maintaining a sufficient thickness on the oxide collar to prevent oxygen diffusion. Alternatively, the nitride layer may be sandwiched between the original oxide collar and an additional thermally deposited oxide layer.
Career Highlights
Throughout his career, Herb Lei Ho has worked with prominent companies in the technology sector. Notably, he has been associated with Siemens Aktiengesellschaft and IBM. His experience in these organizations has contributed to his expertise in semiconductor technologies and innovations.
Collaborations
Herb Lei Ho has collaborated with various professionals in the field, including his coworker Erwin Hammerl. These collaborations have further enriched his work and contributions to the industry.
Conclusion
Herb Lei Ho's innovative work in DRAM technology and his contributions to the semiconductor industry highlight his importance as an inventor. His patents and career achievements reflect a commitment to advancing technology and improving memory systems.