| Title: |
Influence of Pixel Etching on Electrical and Electro-Optical Performances of a Ga-Free InAs/InAsSb T2SL Barrier Photodetector for Mid-Wave Infrared Imaging |
| Authors: |
Maxime Bouschet; Ulises Zavala-Moran; Vignesh Arounassalame; Rodolphe Alchaar; Clara Bataillon; Isabelle Ribet-Mohamed; Francisco de Anda-Salazar; Jean-Philippe Perez; Nicolas Péré-Laperne; Philippe Christol |
| Source: |
Photonics, Vol 8, Iss 6, p 194 (2021) |
| Publisher Information: |
MDPI AG, 2021. |
| Publication Year: |
2021 |
| Collection: |
LCC:Applied optics. Photonics |
| Subject Terms: |
mid-wave infrared quantum detector; barrier structure; Ga-free type-II superlattice; pixel etching; Applied optics. Photonics; TA1501-1820 |
| Description: |
In this paper, the influence of etching depth on the dark current and photo-response of a mid-wave infrared Ga-free T2SL XBn pixel detector is investigated. Two wet chemical etching depths have been considered for the fabrication of a non-passivated individual pixel detector having a cut-off wavelength of 5 µm at 150 K. This study shows the strong influence of the lateral diffusion length of a shallow-etched pixel on the electro-optical properties of the device. The lowest dark current density was recorded for the deep-etched detector, on the order of 1 × 10−5 A/cm2 at 150 K and a bias operation equal to −400 mV. The corresponding quantum efficiency was measured at 60% (without anti-reflection coating) for a 3 µm thick absorbing layer. A comparison of experimental results obtained on the two kinds of etched pixels demonstrates the need for a deep-etching process combined with efficient passivation for FPA manufacturing. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2304-6732 |
| Relation: |
https://www.mdpi.com/2304-6732/8/6/194; https://doaj.org/toc/2304-6732 |
| DOI: |
10.3390/photonics8060194 |
| Access URL: |
https://doaj.org/article/342d8ffdbdee4e3cbe85c21cec65d69a |
| Accession Number: |
edsdoj.342d8ffdbdee4e3cbe85c21cec65d69a |
| Database: |
Directory of Open Access Journals |