Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Alexandre Ferron

Olivier Gravrand

Francois Boulard

Cyril Cervera

François Boulard

A photodetection device includes a pixel matrix in which each pixel includes a barrier photodetector. The pixel matrix includes an absorption layer, a barrier layer, a contact layer, and at least one separation element to delimit the pixels. At least one separation element extends above the contact layer, and forms at least one depletion zone that extends locally in the contact layer, to block the lateral circulation of charge carriers.

Barrier photodetectors matrix with pixellation by local depletions

A semi-conducting structure, configured to receive an electromagnetic radiation and to transform the electromagnetic radiation into an electric signal, including: a first zone and a second zone of a same conductivity type and of same elements; a barrier zone, provided between the first and second zones, for acting as a barrier to majority carriers of the first and second zones on a barrier thickness, the barrier zone having its lowest bandgap energy defining a barrier proportion; and a first interface zone configured to interface the first zone and the barrier zone on a first interface thickness, the first interface zone including a composition of elements which is varied from a proportion corresponding to that of the first material to the barrier proportion, the first interface thickness being at least equal to half the barrier thickness.

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Grenoble, France

Alexandre Ferron