Colloidal quantum dot based infrared detectors: extending to the mid-infrared and moving from the lab to the field

Abstract

Quantum dots (QDs) that absorb in the mid-wave infrared (MWIR) regime (3-5 μm) have recently generated significant interest as possible detector materials for MWIR cameras, with promises to reduce materials...

Extended Short-Wave Photodiode Based on CdSe/HgTe/Ag2Te Stack with High Internal Efficiency

“…The specific detectivity reaches almost 10 11 Jones at room temperature and 10 12 Jones at 200 K, making this device not only matches stateof-the-art HgTe NC-based devices but also available commercial technologies. 1,20 The time response appears to be in the 200− 700 ns range depending on the pixel size, and we demonstrate using time-resolved photoemission that this time response can be directly connected to the carrier dielectric relaxation. Finally, we discuss where future efforts should be focused to push the external quantum efficiency (EQE) close to 100%.…”

Material Perspective on HgTe Nanocrystal-Based Short-Wave Infrared Focal Plane Arrays

“…Following their use as light downconverters in displays and farming, nanocrystals are now being integrated into infrared cameras, − one of the first commercial applications in which the material is both electrically and optically active. So far, most reported cameras , are based on PbS nanocrystals and operate in the near-infrared and short-wave infrared. − ,− HgTe holds more promise for the design of longer wavelength sensors in the extended short-wave and midwave infrared. On the other hand, there are, to date, only a few reports of imaging based on this material. ,− …”

Photoconductive focal plane array based on HgTe quantum dots for fast and cost-effective short-wave infrared imaging

“…Colloidal quantum dots (QDs) now offer an interesting alternative. 2 Over the past two decades, a lot of efforts have been dedicated, first to push their absorption toward longer wavelengths 3–5 and later to integrate them into functional devices such as LEDs, 6–9 solar cells 10 and IR sensors. 2,11–14 For the latter application, most of the efforts have been focused on the design of single pixel devices, but there are few reports relative to image sensors.…”

“…2 Over the past two decades, a lot of efforts have been dedicated, first to push their absorption toward longer wavelengths 3–5 and later to integrate them into functional devices such as LEDs, 6–9 solar cells 10 and IR sensors. 2,11–14 For the latter application, most of the efforts have been focused on the design of single pixel devices, but there are few reports relative to image sensors. 12,15–19 Several companies (such as SWIR Vision, 20–22 ST Microelectronics, 23 IMEC, 1,24–26 Emberion, 27 QDIR, Osram) are now developing or even commercializing nanocrystal-based cameras.…”

“…Colloidal quantum dots (QDs) now offer an interesting alternative. 2 Over the past two decades, a lot of efforts have been dedicated, first to push their absorption toward longer wavelengths [3][4][5] and later to integrate them into functional devices such as LEDs, [6][7][8][9] solar cells 10 and IR sensors. 2,[11][12][13][14] For the latter application, most of the efforts † Electronic supplementary information (ESI) available: Ellipsometric measurements, simulation of the electric field and current density distribution, additional data relative to EQE determination, imaging at high frame rate, procedure for image correction, additional infrared imaging using band pass filters.…”