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Cooled infrared focal plane array: study of pixels stability

Technological challenge: Photonics, Imaging and displays (learn more)

Department: Département d'Optronique (LETI)

Laboratory: Laboratoire d'Imagerie IR

Start Date: 01-10-2022

Location: Grenoble

CEA Code: SL-DRT-22-0711

Contact: nicolas.baier@cea.fr

The Infrared Laboratory of the Optical and Photonics department of CEA-LETI, associated with the manufacturer LYNRED develop cooled infrared detectors using the HgCdTe technology, with state-of-the-art performances. However, for some specific applications, typically spatial ones like astrophysics or earth observation, defects detected on these focal plane arrays have to be understood and eventually corrected. In this scope, the subject of this thesis is to reveal the link between mechanical constraint applied on the detectors and the defects. Using a specific test bench able to apply a constraint on an operating detector, the defective pixels will be analyzed with electro-optical measurements. Their behavior and properties, especially the temporal noise, its amplitude and spectral content, may be the clues to understand the physical mechanisms in the semiconductor. Depending on the technological variant studied, the key parameters to understand the physics of these defects will be pointed out and a specific evolution of the technological process may be proposed.

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