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:
Oct. 13, 2015
Filed:
Nov. 13, 2012
Quantum Electro Opto Systems Sdn. Bhd., Melaka, MY;
Gabriel Walter, Madison, WI (US);
Quantum Electro Opto Systems Sdn. Bhd., Melaka, MY;
Abstract
A method for producing optical signals with improved efficiency, including the following steps: providing a layered semiconductor structure that includes a substrate, a semiconductor collector region of a first conductivity type, a semiconductor base region of a second conductivity type disposed on the collector region, and a semiconductor emitter region of the first semiconductor type disposed as a mesa over a portion of a surface of the base region; providing, in the base region, at least one region exhibiting quantum size effects; providing collector, base, and emitter electrodes, respectively coupled with the collector, base and emitter regions; providing a tunnel barrier layer over at least the exposed portion of the surface of the base region; and applying signals with respect to the collector, base, and emitter electrodes to produce optical signals from the base region.