Download or read book Multi Color Quantum Well Infrared Photodetectors for Mid Long and Very Long Wavelength Infrared Applications written by Sheng S. Li and published by . This book was released on 2002 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum well infrared photodetectors (QWIPs) have been widely investigated for the 3 - 5 micrometers mid-wavelength infrared (MWIR) and 8 - 12 micrometers long-wavelength infrared (LWIR) atmospheric spectral windows as well as very long wavelength infrared (VLWIR: lambda(sub c)> 14 micrometers) detection in the past decade. The mature III-V compound semiconductor growth technology and the design flexibility of device structures have led to the rapid development of various QWIP structures for infrared focal plane arrays (FPAs) applications. In addition to the single-color QWIP with narrow bandwidth, the multi-color QWIP required for advanced IR sensing and imaging applications have also been emerged in recent years. Using band gap engineering approach, the multi-color (2, 3, and 4- color) QWIPs using multi-stack quantum wells with different well width and depth and voltage-tunable triple-coupled quantum well (TCQW) structure for detection in the MWIR, LWIR, and VLWIR bands have been demonstrated. In this paper, the design, fabrication, and characterization of a voltage-tunable 2-stack 3-color QWIP for MW/LW/LW IR detection and a 3-stack 3-color QWIP for detection in the water, ozone, and CO2 atmospheric blocking bands are depicted.
Download or read book Quantum Well Infrared Photodetectors written by Harald Schneider and published by Springer. This book was released on 2006-10-18 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Addressed to both students as a learning text and scientists/engineers as a reference, this book discusses the physics and applications of quantum-well infrared photodetectors (QWIPs). It is assumed that the reader has a basic background in quantum mechanics, solid-state physics, and semiconductor devices. To make this book as widely accessible as possible, the treatment and presentation of the materials is simple and straightforward. The topics for the book were chosen by the following criteria: they must be well-established and understood; and they should have been, or potentially will be, used in practical applications. The monograph discusses most aspects relevant for the field but omits, at the same time, detailed discussions of specialized topics such as the valence-band quantum wells.
Download or read book Mid Wavelength Quantum Well Infrared Photodetectors written by and published by . This book was released on 1998 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum-well infrared photodetectors (QWIPs) have developed rapidly over the past ten years. Most of the efforts have been concentrated on the longwavelength and the very-long-wavelength regions of the thermal emission spectrum. Due to the success of InSb, HgCdTe, and PtSi detectors in the midwavelength infrared region, less emphasis has been placed on the development of QWIP focal-plane arrays operating in this wavelength band. However, recent interest in establishing pixel-registered, multispectral imaging capabilities has emphasized the need for high-quality mid-wavelength detectors that can be integrated with long-wavelength devices. In this presentation, the design and characterization of QWIPs using InGaAs/AlGaAs grown on GaAs substrates and InGaAs/InAlAs grown on InP substrates will be discussed. Both of these material systems can be used as single-wavelength, mid-wave devices and are compatible with vertical integration to give multispectral operation. Fundamental detector parameters, such as optical absorption strength, photoconductive gain, and temperature-dependent dark current, have been determined for various midwavelength QWIP designs and will be presented along with the results of singlepixel radiometric tests.
Download or read book The Physics of Quantum Well Infrared Photodetectors written by K. K. Choi and published by World Scientific. This book was released on 1997 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past, infrared imaging has been used exclusively for military applications. In fact, it can also be useful in a wide range of scientific and commercial applications. However, its wide spread use was impeded by the scarcity of the imaging systems and its high cost. Recently, there is an emerging infrared technology based on quantum well intersubband transition in III-V compound semiconductors. With the new technology, these impedances can be eliminated and a new era of infrared imaging is in sight. This book is designed to give a systematic description on the underlying physics of the new detectors and other issues related to infrared managing.
Download or read book Development of New III V Semiconductor Quantum Well Infrared Photodetectors for Mid and Long wavelength Infrared Detection written by Yanhua Wang and published by . This book was released on 1994 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation three types of III-V semiconductor quantum well infrared photodetectors (QWIPs) have been developed for 3-5 um mid-wavelength infrared (MWIR) and 8-14 um long-wavelength infrared (LWIR) detection. they are (1) GaAs/AlGaAs, GaAs/InGaP bound to continuum (BTC) QWIPs and InGaAs/InAlAs bound to miniband (BTM) QWIP, (2) nomral-incidence type II indirect bandgap AlAs/AlGaAs QWIP, and (3) normal incidence p-type strained layer InGaAS/InAlAs and InGaAs/GaAs QWIPs. These QWIP structures were grown by the molecular beam epitaxy (MBE) technique, with the exception of the GaAs/InGaP QWIP, which was grown by the metal-organic chemical vapor deposition (MOCVD) technique. Detectivity ranging from 10^9 to 10^12 cm-\/Hz/W was obtained for these QWIPs at T=77 K. The BTC and BTM QWIPs exhibited both photoconductive (PC) an photvoltain (PV) dual-mode (DM) detection characteristics. the peak wavelengths for the GaAs/AlGaAs QWIP were found to be at 7.7um and 12 um. The peak wavelengths for the GaAs/InGaP QWIP were found to be at 6.0um and 8.2 um. the voltage tunable InGaAs/InAlAs QWIP showed a peak wavelength of 10 um with dual-mode operation. a normal-incidence type II indirect bandgap AlAs/AlGaAs QWIP grown on (110)GaAS substrate was developed, which shows a multicolor detection feature with peak response wavelengths occurred at 2.2, 2.7, 3.5, 4.8, 6.5, and 12.5 um. Extremely large photo-conductivity gains of 630 and 3200 at peak wavelengths of 3.5 and 2.2 um were obtained at Vb=3 and 6 V, respectively, while a broad spectral photoresponse with peak wavelength at 12.5 um was observed. A normal-incidence p-type tensile strained-layer InGaAs/InAlAs QWIP grown on InP substrate with an ultralow dark current density (about six orders of magnitude smaller than the standard GaAs/AlGaAs QWIP) was developed in this work. this QWIP has achieved background limited performance (BLIP) for T
Download or read book High Responsivity Tunable Step Quantum Well Infrared Photodetector written by Yeo Hwee Tiong and published by . This book was released on 2004-12-01 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the performance of a step quantum well infrared photodetector (QWIP), which was designed to detect a laser spot at 1.05 m and IR radiation between 9.5 m to 10.5 m, was evaluated. In the far infrared (FIR), the maximum responsivity of the test detector at 10 K was measured at 1.02 A/W with a peak wavelength of 10.3 m under a negative bias of 0.83 V. The D* at background limited infrared performance (BLIP) was measured at 8.0x10(9) cm square root Hz/W with 180 degrees field of view. The BLIP temperature was found to be about 55 K. In addition, the FIR detection wavelength found shift with the amount of bias across the device. The amount of shift observed was 0.21 meV/ kvcm-1 which is due to linear Stark effect associated with the step quantum well. The quantum well infrared detectors made of square quantum wells found to have an order of magnitude lower Stark shift originated from second order effects. This suggests that the step well infrared detector can have applications in tunable wavelength infrared detectors.
Download or read book Long Wavelength Infrared Detectors written by Manijeh Razeghi and published by CRC Press. This book was released on 2020-03-09 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely work presents a comprehensive overview of the development of new generations of infrared detectors based on artificially synthesized quantum structures. The growth of quantum wells and superlattices is well documents in this volume, as are the principal new superlattice technologies for long wavelength infrared detection. Featuring insightful contributions from researchers working at the "cutting edge" of this exciting field, this volume is sure to become an essential reference for advanced graduate students and researchers alike.
Download or read book Characterization and Analysis of a Multicolor Quantum Well Infrared Photodetector written by and published by . This book was released on 2006 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents analysis and characterization of performance of a newly designed, multicolor quantum well infrared photodetector (QWIP). Specifically, it focuses on a detector capable of detecting infrared emissions in the near infrared (NIR), mid-wavelength infrared (MWIR), and long-wavelength infrared (LWIR). Through photocurrent spectroscopy and performance analysis, this prototype detector can be classified and prepared for possible future use within the U.S. Armed Forces. Certain military applications require a highly accurate, reliable, sensitive, and multispectral infrared detector to identify targets and ensure mission success. By designing and fabricating a multicolor quantum well infrared photodetector, simultaneous detection of targets in the near infrared, mid-wavelength infrared and long-wavelength infrared is possible using only one detector. In addition, power and cooling requirements for quantum well infrared detectors makes them suitable for use in the field.
Download or read book Proceedings of the Fifth International Symposium on Long Wavelength Infrared Detectors and Arrays Physics and Applications written by Sheng S. Li and published by The Electrochemical Society. This book was released on 1997 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Research and Development written by and published by Elsevier. This book was released on 1995-11-22 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physics of Thin Films is one of the longest running continuing series in thin film science, consisting of twenty volumes since 1963. The series contains quality studies of the properties of various thinfilms materials and systems. In order to be able to reflect the development of today's science and to cover all modern aspects of thin films, the series, starting with Volume 20, has moved beyond the basic physics of thin films. It now addresses the most important aspects of both inorganic and organic thin films, in both their theoretical as well as technological aspects. Therefore, in order to reflect the modern technology-oriented problems, the title has been slightly modified from Physics of Thin Films to Thin Films. Discusses the latest research about structure, physics, and infrared photoemissive behavior of heavily doped silicon homojunctions and Ge and GaAs-based alloy junctions Reviews the current status of SiGe/Si quantum wells for infrared detection Discusses key developments in the growing research on quantum-well infrared photodetectors (QWIPs) Reviews Chois development of a family of novel three-terminal, multi-quantum well devices designed to improve high-temperature IR detectivity at long wavelengths Describes recent studies aimed at using multi-quantum well structures to achieve higher performance in solar cell devices based on materials systems
Download or read book Proceedings of the Third International Symposium on Long Wavelength Infrared Detectors and Arrays Physics and Applications III written by Sheng S. Li and published by The Electrochemical Society. This book was released on 1995 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the First International Symposium on Long Wavelength Infrared Detectors and Arrays Physics and Applications written by Farhad Radpour and published by . This book was released on 1995 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Sixth International Symposium on Long Wavelength Infrared Detectors and Arrays Physics and Applications written by Sheng S. Li and published by The Electrochemical Society. This book was released on 1999 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physics Of Quantum Well Infrared Photodetectors written by Kwong-kit Choi and published by World Scientific. This book was released on 1997-06-12 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past, infrared imaging has been used exclusively for military applications. In fact, it can also be useful in a wide range of scientific and commercial applications. However, its wide spread use was impeded by the scarcity of the imaging systems and its high cost. Recently, there is an emerging infrared technology based on quantum well intersubband transition in III-V compound semiconductors. With the new technology, these impedances can be eliminated and a new era of infrared imaging is in sight. This book is designed to give a systematic description on the underlying physics of the new detectors and other issues related to infrared imaging.
Download or read book Semiconductor Quantum Wells and Superlattices for Long wavelength Infrared Detectors written by Mahmoud Omar Manasreh and published by Artech House Materials Science. This book was released on 1993 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a basic understanding of how semiconductor quantum wells and superlattices can be used for long-wavelength infrared detectors and related systems. It represents a step towards a knowledge of novel structures that could be used for high-performance infrared detectors and imaging rays.
Download or read book Intersubband Infrared Photodetectors written by Victor Ryzhii and published by World Scientific. This book was released on 2003-06-25 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infrared technologies are very important for a wide range of military, scientific and commercial applications. Devices and systems based on semiconductor heterostructure and quantum well and quantum dot structures open up a new era in infrared technologies.This book deals with various topics related to the latest achievements in the development of intersubband infrared photodetectors, reviewed by top experts in the field. It covers physical aspects of the operation of the devices as well as details of their design in different applications. The papers included in the book will be useful for researchers and engineers interested in the physics of optoelectronic devices as well as their practical design and applications.
Download or read book GUIA do produtor written by and published by . This book was released on 1996 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Administração direta; Secretaria de política grícola-SPA; Abastecimento agropecuário; Secretaria de desenvolvimento rural-SDR; Assistência técnica e extensão rural; Conservação de solo e água; Cooperativismo e associativismo rural; Informação agrícola; Infra-estrutura rural; Mecanização e aviação agrícolas; Produção animal; Produção vegetal; Secretaria de defesa agropecuária-SDA; Defesa animal; Inspeção de produtos de origem animal; Defesa e inspeção vegetal; Endereços (EMATER, DEA, Convênios de classificação vegetal, Criadores de bovinos e laboratórios); Comissão especial de recursos-CER; Comissão executiva do plano da lavoura cacaueira-CEPLAC; Instituto naional de meteorologia-INMET; Administração indireta; Instituto nacional de colonização e reforma agrária-INCRA; Companhia Nacional de Abastecimento-CONAB; Empresa brasileira de pesquisa agropecuária -EMBRAPA; Companhia de colonização do nordeste-COLONE.
