Multiple-quantum-well (MQW) photodetectors of a proposed type would contain active regions comprising multiple superlattice subregions. These devices would have complex structures: The superlattice of each subregion would be designed for enhanced absorption of photons in a desired wavelength band (typically in the infrared) and multiple subregions of different design would be cascaded for multicolor operation.
The designs of these photodetectors would take advantage of the characteristic alignment of the edges of the electronenergy bands in type-II quantum-well structures: Within each finite superlattice, interband transitions would be used for detecting photons, and between finite superlattices, intraband relaxation and interband tunneling would be used for transport of charge carriers, all such as to enable detection of normally incident photons.
Absorption of photons in the active region of a photodetector according to the proposal could be significantly enhanced by designing the superlattice/ MQW structures to contain closely spaced energy states. The photodetector could be operated with a small bias to facilitate transport of charge carriers. The superlattices could be somewhat chirped, with a preferred transport direction.
This work was done by Rui Yang of Caltech for NASA's Jet Propulsion Laboratory. For more information, download the Technical Support Package (free white paper) at www.techbriefs.com/tsp under the Physical Sciences category.
In accordance with Public Law 96-517, the contractor has elected to retain title to this invention. Inquiries concerning rights for its commercial use should be addressed to:
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Refer to NPO-41976, volume and number of this NASA Tech Briefs issue, and the page number.
This Brief includes a Technical Support Package (TSP).
Complex Type-II Interband Cascade MQW Photodetectors
(reference NPO-41976) is currently available for download from the TSP library.
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Overview
The document is a Technical Support Package from NASA's Jet Propulsion Laboratory (JPL) concerning Complex Type-II Interband Cascade Multi-Quantum Well (MQW) Photodetectors, identified by NTR Number 41976. It is part of NASA Tech Briefs, which disseminate information on aerospace-related technological advancements with potential broader applications in various fields.
The focus of this document is on a novel type of photodetector that utilizes a complex active region and incorporates multiple different cascade units, enabling multi-color operation. This innovation is significant as it enhances the capabilities of photodetectors, which are essential components in various applications, including remote sensing, environmental monitoring, and telecommunications.
The document emphasizes the importance of these photodetectors in advancing technology, particularly in areas requiring high sensitivity and specificity in detecting light across different wavelengths. The Type-II interband cascade design allows for improved performance in terms of efficiency and response time, making these devices suitable for a range of scientific and commercial applications.
Additionally, the Technical Support Package serves as a resource for those interested in the commercial potential of this technology. It is part of NASA's Commercial Technology Program, which aims to promote the transfer of aerospace innovations to the private sector. The document encourages collaboration and provides contact information for further inquiries, specifically directing interested parties to the Innovative Technology Assets Management team at JPL.
The document also includes a notice regarding the proprietary nature of the information contained within, highlighting that it may be subject to export control regulations. It clarifies that the U.S. Government and its representatives do not assume liability for the use of the information provided, nor do they guarantee that such use will be free from privately owned rights.
In summary, this Technical Support Package outlines the development and potential applications of Complex Type-II Interband Cascade MQW Photodetectors, showcasing NASA's commitment to innovation and the dissemination of technology that can benefit various sectors beyond aerospace. It serves as a valuable resource for researchers, developers, and businesses interested in leveraging advanced photodetector technology.
