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| Author | : Cindy Alexandra Montenegro Benavides |
| Publisher | : |
| Total Pages | : |
| Release | : 2018 |
| Genre | : |
| ISBN | : |
| Author | : Rauch, Tobias |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 242 |
| Release | : 2014-06-24 |
| Genre | : Conjugated polymers |
| ISBN | : 3731501546 |
Solution-processed photodiodes with infrared sensitivities at wavelengths beyond the bandgap of silicon would be a significant advance towards cost-effective imaging. Colloidal quantum dots are highly suitable as infrared absorbers for photodetection. The concept of organic bulk heterojunctions sensitized with PbS nanocrystalline was proved with efficient near-infrared detection up to 1.8 mm for NIR imaging on active matrix TFT backplanes and demonstrated x-ray sensitivity.
| Author | : Ying Suet Lau |
| Publisher | : |
| Total Pages | : 114 |
| Release | : 2021 |
| Genre | : Electronic books |
| ISBN | : |
In comparison with the commercial inorganic semiconductor-based photodetectors, the solution-processable organic photodetectors (OPDs) offer an attractive option for use in imaging applications, security monitoring and artificial intelligence. This research work aimed at developing high-performance solution- processable OPDs, including transparent near-infrared (NIR) OPDs and the novel photomultiplication (PM)/photovoltaic (PV) dual-mode OPDs for imaging applications. The recent advances in low-bandgap organic materials and solution fabrication technologies have provided an encouraging pathway for imaging applications using OPDs. The PhD work included: (1) analyzing the performance of the NIR OPDs, (2) investigating the photoresponses of the transparent NIR OPDs and the application in NIR visualization, (3) examining the unique filter-free spectral selective photoresponse behavior of the novel PM/PV dual-mode OPDs, and (4) demonstrating the use of the dual-mode OPDs for imaging applications. The photoresponse of the solution-processed large-area transparent NIR OPDs with a high conductivity poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS) upper transparent electrode has been analyzed. The transparent large-area self-powered NIR OPDs have a high specific detectivity of >1012 Jones at 850 nm, and a high -3 dB cutoff frequency of 71 kHz and a linear dynamic range of 154 dB. The visualization of NIR light can be attempted through monolithic integration of transparent NIR OPDs with perovskite light-emitting diodes (PeLEDs). In an NIR-to-visible upconversion device, the transparent NIR OPD unit acts a charge-injection layer to adjust the emission behavior in the LED unit. The hole-electron current balance in the NIR-to-visible upconversion device is controlled by the photocurrent generated in the NIR PD that responds to the NIR portion of the incoming light. The visible light emission in the LED unit is realized in area where the effective charge injection occurs, adjusted by the NIR PD unit in the presence of the NIR light, such that the objects reflecting or illuminating NIR light can be visualized. In parallel to the optimization of transparent NIR photodetection component, the efficiency of the emission component is another crucial factor for determining the overall performance of the NIR-to-visible upconversion devices. Among different types of reported LEDs, the emerging PeLEDs are very attractive for use in NIR-to-visible upconversion devices because they have a high color purity with narrow emission spectrum, high brightness, and high photoluminescence quantum yield. The performance of the large-area cesium lead bromide (CsPbBr3)-based PeLEDs has been optimized through a controlled growth of the perovskite emission layer modified using a hybrid additive approach. The results reveal that the use of the hybrid additive helps to suppress both the structural defects and nonradiative recombination-induced leakage current and assists in improving the electron-hole current balance in the PeLEDs. Apart from the effort in developing NIR visualization devices, spectral crosstalk-free photodetection is another important technique with practical impacts for use in image sensors. The present commercial inorganic semiconductor-based broadband photodetectors require dedicated color filters to realize spectral selective photodetection. The use of the filters increases the complexity and cost of the image sensors. In this work, a novel bias-switchable PM/PV dual-mode OPD has been developed for image applications. The PM/PV dual-mode OPD has a heterostructure photoactive layer, comprising a tandem organic bulk-heterojunction (BHJ) architecture. The first BHJ absorbs the short-wavelength portion of the incoming light, whereas the second BHJ has an extended absorption to longer wavelengths. The spectral photo-selective photodetection is realized by adjusting the difference in wavelengths between the transmission cutoff wavelength of the first BHJ and the absorption edge of the second BHJ in the dual-mode OPDs. Both BHJs are connected in series to form a back-to-back structure. When a forward bias is applied across the ITO and Al contacts, the second BHJ is under its forward current. The first BHJ is under its reverse-biased condition for generating the photocurrent due to the absorption of the short-wavelength portion of the incoming light. Likewise, when a reverse bias is applied across the ITO and Al contacts, the first BHJ is under its forward-biased conduction to conduct the current. The second BHJ is under its reverse-biased condition to generate the photocurrent due to the absorption of the long-wavelength portion of the incoming light. To suppress the spectral crosstalk in the PM/PV dual-mode OPDs, a long- wavelength absorbing functional layer has been adopted in the second BHJ. The use of the PM effect helps to promote the external quantum efficiency of the dual- mode OPDs over 100%, leading to a high photosensitivity for the long-wavelength portion of the incoming light. The dual-mode OPDs with a spectral selective photoresponse in two distinct bands over the visible light spectrum have been realized. For example, the dual-mode OPD, having a device configuration of ITO/ZnO/F8T2:PC61BM/MoO3:PEDOT:PSS/P3HT:PC71BM/Al, has a high photoesponse over the wavelength of
| Author | : Ram K. Gupta |
| Publisher | : CRC Press |
| Total Pages | : 291 |
| Release | : 2024-08-23 |
| Genre | : Science |
| ISBN | : 1040121330 |
Semiconducting Fibers: Preparation, Advances, and Applications is a comprehensive study of the properties and emerging applications of semiconducting fibers. These nanomaterials have unique optoelectronic properties: they are flexible, one-dimensional, and lightweight, and can grow in bulk, thin films, and nano-dimensions (0D, 1D, 2D, 3D). Written by experts from around the world, this book covers the fundamentals of semiconducting fibers, their fabrication, and emerging applications in electronics, optoelectronics, energy, and healthcare. Various approaches to fabricating semiconducting fibers, their characteristics, and the working principles of nano-dimensional devices are covered. Key features: Expert scientists across the world present state-of-the-art progress on semiconducting fibers for emerging applications, including flexible and wearable electronics Provides details of novel methods and advanced technologies used in energy applications of semiconducting fibers Provides fundamentals of electrochemical behavior and their understanding of optoelectronics, photovoltaics, batteries, fuel cells, sensors, and supercapacitors Presents fabrication, characterization, and applications of semiconducting fibers for energy conversion and storage This book will be a key resource for students, academics, and industry professionals interested in the fabrication, device technologies, and applications of semiconducting fibers.
| Author | : Antoni Rogalski |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2022 |
| Genre | : |
| ISBN | : 9781032338668 |
This new edition of Infrared and Terahertz Detectors provides a comprehensive overview of infrared and terahertz detector technology, from fundamental science to materials and fabrication techniques. It includes a new tutorial introduction to technical aspects that are fundamental for basic understanding.
| Author | : Li Wei |
| Publisher | : John Wiley & Sons |
| Total Pages | : 290 |
| Release | : 2020-10-19 |
| Genre | : Science |
| ISBN | : 3527344314 |
Hybrid organic-inorganic perovskites (HOIPs) have attracted substantial interest due to their chemical variability, structural diversity and favorable physical properties the past decade. This materials class encompasses other important families such as formates, azides, dicyanamides, cyanides and dicyanometallates. The book summarizes the chemical variability and structural diversity of all known hybrid organic-inorganic perovskites subclasses including halides, azides, formates, dicyanamides, cyanides and dicyanometallates. It also presents a comprehensive account of their intriguing physical properties, including photovoltaic, optoelectronic, dielectric, magnetic, ferroelectric, ferroelastic and multiferroic properties. Moreover, the current challenges and future opportunities in this exciting field are also been discussed. This timely book shows the readers a complete landscape of hybrid organic-inorganic pervoskites and associated multifuctionalities.
| Author | : Patrick Echlin |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 329 |
| Release | : 2011-04-14 |
| Genre | : Technology & Engineering |
| ISBN | : 0387857311 |
Scanning electr on microscopy (SEM) and x-ray microanalysis can produce magnified images and in situ chemical information from virtually any type of specimen. The two instruments generally operate in a high vacuum and a very dry environment in order to produce the high energy beam of electrons needed for imaging and analysis. With a few notable exceptions, most specimens destined for study in the SEM are poor conductors and composed of beam sensitive light elements containing variable amounts of water. In the SEM, the imaging system depends on the specimen being sufficiently electrically conductive to ensure that the bulk of the incoming electrons go to ground. The formation of the image depends on collecting the different signals that are scattered as a consequence of the high energy beam interacting with the sample. Backscattered electrons and secondary electrons are generated within the primary beam-sample interactive volume and are the two principal signals used to form images. The backscattered electron coefficient ( ? ) increases with increasing atomic number of the specimen, whereas the secondary electron coefficient ( ? ) is relatively insensitive to atomic number. This fundamental diff- ence in the two signals can have an important effect on the way samples may need to be prepared. The analytical system depends on collecting the x-ray photons that are generated within the sample as a consequence of interaction with the same high energy beam of primary electrons used to produce images.
| Author | : |
| Publisher | : Elsevier |
| Total Pages | : 385 |
| Release | : 2011-05-03 |
| Genre | : Science |
| ISBN | : 0123813387 |
Semiconductors and Semimetals has distinguished itself through the careful selection of well-known authors, editors, and contributors. Originally widely known as the "Willardson and Beer" Series, it has succeeded in publishing numerous landmark volumes and chapters. The series publishes timely, highly relevant volumes intended for long-term impact and reflecting the truly interdisciplinary nature of the field. The volumes in Semiconductors and Semimetals have been and will continue to be of great interest to physicists, chemists, materials scientists, and device engineers in academia, scientific laboratories and modern industry. Written and edited by internationally renowned experts Relevant to a wide readership: physicists, chemists, materials scientists, and device engineers in academia, scientific laboratories and modern industry
| Author | : Santosh K. Kurinec |
| Publisher | : John Wiley & Sons |
| Total Pages | : 828 |
| Release | : 2018-12-03 |
| Genre | : Technology & Engineering |
| ISBN | : 1119407680 |
This book covers the recent advances in photovoltaics materials and their innovative applications. Many materials science problems are encountered in understanding existing solar cells and the development of more efficient, less costly, and more stable cells. This important and timely book provides a historical overview, but concentrates primarily on the exciting developments in the last decade. It includes organic and perovskite solar cells, photovoltaics in ferroelectric materials, organic-inorganic hybrid perovskite, materials with improved photovoltaic efficiencies as well as the full range of semiconductor materials for solar-to-electricity conversion, from crystalline silicon and amorphous silicon to cadmium telluride, copper indium gallium sulfide selenides, dye sensitized solar cells, organic solar cells, and environmentally-friendly copper zinc tin sulfide selenides.
| Author | : Josep M. Bayona |
| Publisher | : Academic Press |
| Total Pages | : 2998 |
| Release | : 2012-12-31 |
| Genre | : Science |
| ISBN | : 0123813743 |
Comprehensive Sampling and Sample Preparation is a complete treatment of the theory and methodology of sampling in all physical phases and the theory of sample preparation for all major extraction techniques. It is the perfect starting point for researchers and students to design and implement their experiments and support those experiments with quality-reviewed background information. In its four volumes, fundamentals of sampling and sample preparation are reinforced through broad and detailed sections dealing with Biological and Medical, Environmental and Forensic, and Food and Beverage applications. The contributions are organized to reflect the way in which analytical chemists approach a problem. It is intended for a broad audience of analytical chemists, both educators and practitioners of the art and can assist in the preparation of courses as well in the selection of sampling and sample preparation techniques to address the challenges at hand. Above all, it is designed to be helpful in learning more about these topics, as well as to encourage an interest in sampling and sample preparation by outlining the present practice of the technology and by indicating research opportunities. Sampling and Sample preparation is a large and well-defined field in Analytical Chemistry, relevant for many application areas such as medicine, environmental science, biochemistry, pharmacology, geology, and food science. This work covers all these aspects and will be extremely useful to researchers and students, who can use it as a starting point to design and implement their experiments and for quality-reviewed background information There are limited resources that Educators can use to effectively teach the fundamental aspects of modern sample preparation technology. Comprehensive Sampling and Sample Preparation addresses this need, but focuses on the common principles of new developments in extraction technologies rather than the differences between techniques thus facilitating a more thorough understanding Provides a complete overview of the field. Not only will help to save time, it will also help to make correct assessments and avoid costly mistakes in sampling in the process Sample and sample preparation are integral parts of the analytical process but are often less considered and sometimes even completely disregarded in the available literature. To fill this gap, leading scientists have contributed 130 chapters, organized in 4 volumes, covering all modern aspects of sampling and liquid, solid phase and membrane extractions, as well as the challenges associated with different types of matrices in relevant application areas
