Matrix of photodetectors with peripheral absorption provided with focussing structures

US11152406B2 · kind B2 · utility

Assignee

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

• Giacomo BADANO · Le Pont-de-Claix, FR
• Clément Lobre · Grenoble, FR

Key dates

• Filing date: Nov 25, 2019
• Grant date: Oct 19, 2021
• Expiry date: Nov 25, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10F39/8063

Abstract

A photodetection device including a pixel matrix, each of the pixels including a photodiode, the absorption region of which extends entirely or almost entirely inside a volume surrounding a central region of the pixel; and a focusing element. An assembly of focusing elements is composed of refractive structures, each formed by a first truncated pyramid with a recess in the shape of a second inverted pyramid. The angles φi at the base of the pyramids satisfy the following relation: wherein n0 is the optical index of a medium surrounding the refractive structures on the side opposite the photodiodes, and n1 is an optical index of the refractive structures.