III-V charge coupled device suitable for visible, near and far infra-red detection
US6870207B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 2000 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | Apr 24, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E10/544
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
A photon detector is obtained by using the intersubband absorption mechanism in a modulation doped quantum well(s). The modulation doping creates a very high electric field in the well which enables absorption of input TE polarized light and also conducts the carriers emitted from the well into the modulation doped layer from where they may recombine with carriers from the gate contact. Carriers are resupplied to the well by the generation of electrons across the energy gap of the quantum well material. The absorption is enhanced by the use of a resonant cavity in which the quantum well(s) are placed. The absorption and emission from the well creates a deficiency of charge in the quantum well proportional to the intensity of the input photon signal. The quantity of charge in the quantum well of each detector is converted to an output voltage by transferring the charge to the gate of an output amplifier. The detectors are arranged in the form of a 2D array with an output amplifier associated with the entire array or a row of the array as in the known charge coupled devices, or a separate amplifier could be dedicated to each pixel as in the known architecture of the active pixel devi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.