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:
Mar. 22, 1994
Filed:
Feb. 17, 1993
Benoit Deveaud-Pledran, Lannion, FR;
Jean-Michel Gerard, Paris, FR;
France Telecom, , FR;
Abstract
Photoelectric detector presenting a multiple quantum well structure, each quantum well comprising a first barrier made from a first semiconductor material, a well made from a second semiconductor material, and a second barrier made from a third semiconductor material, each semiconductor material being defined by its chemical composition, and the electric conductibility in the detector being ensured by propagation, from the first barrier to the second barrier, of given charge carriers in a given electronic band, presenting an energy extremum in each of the said materials. In accordance with the invention, said semiconductor materials are at least partly doped with carriers, the chemical composition of the first and third semiconductor materials being such that the difference in energy, between the energy extremum of the said electronic band in the first semiconductor material and the energy extremum of the said electronic band in the third semiconductor material, is greater in absolute value than the maximum energy of the optical longitudinal phonons in the second semiconductor material making up the well. Application: infrared detectors, especially in the range 2.times.10.sup.13 -4.times.10.sup.13 Hz.