William R Clark

Title: The Innovations of William R. Clark

Introduction

William R. Clark is an accomplished inventor based in Tyngsboro, MA (US). He holds 2 patents that showcase his expertise in the field of photodiodes and avalanche photodiodes. His innovative designs have contributed significantly to advancements in optical technology.

Latest Patents

One of his latest patents is the "Three-terminal avalanche photodiode." This invention features an avalanche photodiode (APD) that includes an absorption layer above the multiplication layer. The thickness of the multiplication layer is defined through a growth process. The APD also incorporates a third terminal, or peripheral ring terminal, which collects charge carriers generated outside the optically-active region of the device. This design effectively manages undesirable dark current throughout the device's lifespan. Additionally, the three-terminal design can be utilized in other photodetectors, including PIN diodes.

Another significant patent is the "Epitaxially grown avalanche photodiode." This invention combines the advantages of planar structure photodiodes and mesa structure photodiodes. The semiconductor layers are epitaxially grown, similar to traditional planar structures. However, the upper doped layer is also epitaxially grown, unlike traditional planar structures where the upper layer is formed by diffusion depth targeting. The edges of the upper layer are then removed by etching to create an island-like structure. Termination junctions are formed by deep diffusion of an impurity of the same type as the dopant in the lower doped layer, which prevents exposure of the edges of the photodiode to the ambient environment. This design enhances the reliability of a planar structure device while maintaining the precision of a mesa structure device, making it particularly beneficial for avalanche photodiodes.

Career Highlights

William R. Clark has worked with notable companies such as Corning Lasertron, Incorporated and Nortel Networks Corporation. His experience in these organizations has allowed him to refine his skills and contribute to significant technological advancements.

Collaborations

One of his notable coworkers is Serguei An, with whom he has collaborated on various projects throughout his career.

Conclusion

William R. Clark's contributions to the field of photodiodes and avalanche photodiodes demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to advancing optical technology, making him a noteworthy figure in the realm of