The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 2021
Filed:
Feb. 18, 2020
National Central University, Taoyuan, TW;
Jin-Wei Shi, Taoyuan, TW;
National Central University, Taoyuan, TW;
Abstract
An avalanche photodiode (APD) is provided with a mixed composite charge layer. A novel structure of InAlAs is designed with the mixed layer. A single P-type field control layer is divided into three layers of different materials with each two forming a heterojunction structure. By controlling the relative concentration distributions and thicknesses of the first, second, and third P-type field control layers along with a mesa shape formed through chemical selective etching, a part of the second P-type field control layer is exposed to the air with a part of the first one etched out at the same time through this single structure having the mesa shape. Thus, the field of a multiplication layer is further confined at center to concentrate electric-field so that fringe field is low but not collapsed. Hence, the overall speed is increased, the intensity high, and sensitivity good while response is fast and efficiency high.