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. 15, 2008
Filed:
Oct. 17, 2006
Yusuke Matsukura, Kawasaki, JP;
Yusuke Matsukura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A photodetecting device which is capable of performing photodetection with a high sensitivity in a wide temperature range. A quantum dot structure including an embedding layer and quantum dots embedded by the embedding layer is formed. A quantum well structure including embedding layers and a quantum well layer whose band gap is smaller than those of the embedding layers is formed at a location downstream of the quantum dot structure in the direction of flow of electrons which flow perpendicularly to the quantum dot structure during operation of the photodetecting device. This reduces the temperature dependence of the potential barrier of a photodetecting section, which has to be overcome by electrons, whereby it is possible to lower the potential barrier of the embedding layers at high temperature.