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Author: Yuanjia Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages : 318
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Author: Yuanjia Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages : 318
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Author: Calla Mae McCulley
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Thin-film transistors (TFTs) function as electrical switches within integrated circuits. Precise control over the on and off states of this switch are crucial for device implementation into the various circuit applications. Currently, organic and polymer thin film semiconductors face challenges that differ from the semiconductors used in modern-day TFTs. However, they have their advantages such as being solution processable, relatively inexpensive, and deposition can be performed on a larger variety of substrates for flexible applications. Therefore, this dissertation consists of many approaches we have explored to overcome the performance challenges (low on-currents and mobilities) of organic and polymer semiconductor-based TFTs. Our approaches were implemented in large- and short-channel TFTs to study the effects of scaling down closer to current dimensions used in state-of-the-art technologies. The modifications to the dielectric layer, the electrical contacts, and the thin-film semiconductor layer were all investigated to highlight the impact each layer contributes to overall electrical TFT performance
Author: Jeongwon Park
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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Organic thin-film transistors (OTFTs) have received increasing attention because of their potential applications in displays, optoelectronics, logic circuits, and sensors. Ultrathin OTFTs are of technical interest as a possible route toward reduced bias stress in standard OTFTs and enhanced sensitivity in chemical field-effect transistors (ChemFETs). ChemFETs are OTFTs whose output characteristics are sensitive to the presence of analytes via changes in the channel mobility and/or threshold voltage induced by analyte chemisorption onto the channel materials. The fundamental understanding of charge transport properties of organic thin-films is critical for the applications. OTFT has been demonstrated by many groups; however, there has been much less progress towards more reliable contact structure between organic materials and electrodes. This thesis investigates the electrical properties of metal phthalocyanine thin-film devices. In chapter 1, the basic electrical properties in OTFTs are reviewed. In chapter 2, we have investigated the microfabrication process of OTFTs to control the contact morphology and the charge transport properties of phthalocyanine thin-film devices. In chapter 3, the channel thickness dependence of the mobility was investigated in bottom-contact copper phthalocyanine (CuPc) OTFTs. The current-voltage characteristics of bottom contact CuPc OTFTs with low contact resistance fabricated by the bilayer photoresist lift-off process were analyzed to determine the mobility, threshold voltage and contact resistance. The independence of measured electronic properties from channel thickness is due to the contact resistance being negligible for all channel thicknesses. For practical applications, the aging and recovery process in CuPc OTFTs were investigated in chapter 4. An origin of the aging process on CuPc OTFTs has been investigated based on the responses of thick 1000ML CuPc OTFTs under a controlled atmosphere. The recovery process under 30 % relative humidity with pure dry air for 48 hours and pure dry air for 24 hours can improve the OTFTs performance with a good current saturation behavior, a high mobility, a low threshold voltage and a high current on/off ratio due to controlling dopants. The bottom contact OTFTs with low contact resistance created in this work could serve useful in a variety of applications and initial results are presented for their use as displays, optoelectronics, logic circuits, and sensors.
Author: Andraž Petrović
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
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Author: Mahdieh Aghamohammadi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Michael C. Petty
Publisher: John Wiley & Sons
ISBN: 1119631343
Category : Technology & Engineering
Languages : en
Pages : 480
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Book Description
Electrical Processes in Organic Thin Film Devices A one-stop examination of fundamental electrical behaviour in organic electronic device architectures In Electrical Processes in Organic Thin Film Devices: From Bulk Materials to Nanoscale Architectures, distinguished researcher Michael C. Petty delivers an in-depth treatment of the electrical behaviour of organic electronic devices focused on first principles. The author describes the fundamental electrical behaviour of various device architectures and offers an introduction to the physical processes that play a role in the electrical conductivity of organic materials. Beginning with band theory, the text moves on to address the effects of thin film device architectures and nanostructures. The book discusses the applications to devices currently in the marketplace, like displays, as well as those under development (transistors, solar cells, and memories). Electrical Processes in Organic Thin Film Devices also describes emerging organic thin film architectures and explores the potential for single molecule electronics and biologically inspired devices. Finally, the book also includes: A detailed introduction to electronic and vibrational states in organic solids, including classical band theory, disordered semiconductors, and lattice vibrations Comprehensive explorations of electrical conductivity, including electronic and ionic processes, carrier drift, diffusion, the Boltzmann Transport Equation, excess carriers, recombination, doping, and superconductivity An overview of important electro-active organic materials, like molecular crystals, charge-transfer complexes, conductive polymers, carbon nanotubes, and graphene Practical considerations of defects and nanoscale phenomena, including transport processes in low-dimensional systems, surfaces and interface states In-depth examinations of metal contacts, including ohmic contacts, the Schottky Barrier, and metal/molecule contacts A systematic guide to the operating principles of metal/insulator/semiconductor structures and the field effect A set of problems (with solutions on-line) for each chapter of the book Perfect for electronics developers and researchers in both industry and academia who study and work with molecular and nanoscale electronics, Electrical Processes in Organic Thin Film Devices also deserves a place in the libraries of undergraduate and postgraduate students in courses on molecular electronics, organic electronics, and plastic electronics.
Author: Tarek Zaki
Publisher: Springer
ISBN: 3319188968
Category : Science
Languages : en
Pages : 232
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Book Description
This work takes advantage of high-resolution silicon stencil masks to build air-stable complementary OTFTs using a low-temperature fabrication process. Plastic electronics based on organic thin-film transistors (OTFTs) pave the way for cheap, flexible and large-area products. Over the past few years, OTFTs have undergone remarkable advances in terms of reliability, performance and scale of integration. Many factors contribute to the allure of this technology; the masks exhibit excellent stiffness and stability, thus allowing OTFTs with submicrometer channel lengths and superb device uniformity to be patterned. Furthermore, the OTFTs employ an ultra-thin gate dielectric that provides a sufficiently high capacitance to enable the transistors to operate at voltages as low as 3 V. The critical challenges in this development are the subtle mechanisms that govern the properties of aggressively scaled OTFTs. These mechanisms, dictated by device physics, are well described and implemented into circuit-design tools to ensure adequate simulation accuracy.
Author: Mahdieh Aghamohammadi
Publisher:
ISBN: 9788449064753
Category :
Languages : en
Pages : 170
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Book Description
Las propiedades de las películas de semiconductores orgánicas y, en particular, de las interfases involucradas, son uno de los aspectos más prominentes en relación con la eficiencia de los dispositivos orgánicos. La interfase formada entre dos materiales orgánicos puede influenciar las propiedades electrónicas y ópticas de los dispositivos de diferentes manteras: por los mecanismos de crecimiento, la morfología, la densidad de defectos y la estructura electrónica. El impacto de la orientación molecular en interfases de materiales orgánicos es una de las cuestiones menos entendidas y menos investigadas en relación con la eficiencia de células solares orgánicas. Mediante el uso de microscopia de sonda cercana (SPM) y fotoluminiscencia, se ha demostrado en esta tesis una correlación clara entre la orientación molecular en la interfase de DIP (donor)/PTCDI-C8 (aceptor) y la formación de un estado de transferencia de carga para aquellas heteroestructuras en las que el solape de los orbitales p en moléculas adyacentes es favorecido. Otro tipo de interfase de materiales orgánicos de gran relevancia se encuentra en los transistores orgánicos de película delgada (TFTs), en el que el dieléctrico es funcionalizado con películas orgánicas autoensambladas (SAMs). El uso de SAMs es una tecnología muy prometedora en la manufacturación de transistores orgánicos para conseguir voltajes de operación deseados dado que el voltaje umbral de operación puede ser modulado mediante la elección de las SAMs. El origen físico de este fenómeno ha sido muy debatido en la literatura y permanece una cuestión abierta. Microscopia de sonda Kelvin ha sido empleada como herramienta para explorar las propiedades electrónicas de la interfase entre DNTT (semiconductor orgánico) y dos SAMs con cadenas alquílica terminadas en grupos metil o metil fluorinados. Dicho estudio en correlación con la operación de los TFTs con DNTT ha revelado que el voltaje umbral depende de la capacitancia del dieléctrico solamente para la SAM fluorinada y se ha determinado que se debe a la interacción electrónica en la interfase entre DNTT y los grupos F de la SAM. En conjunto, los estudios realizados en esta tesis combinan una serie de métodos sistemáticos y técnicas complementarias que han permitido abordar el efecto de procesos electrónicos en interfases de relevancia en células solares y TFTs. Los resultados de esta tesis ponen de manifiesto la importancia del control de las propiedades estructurales y electrónicas de las interfases de materiales orgánicos como paso necesario para mejorar la eficiencia de dispositivos.
Author: Brajesh Kumar Kaushik
Publisher: CRC Press
ISBN: 1498736556
Category : Technology & Engineering
Languages : en
Pages : 372
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Book Description
Text provides information about advanced OTFT (Organic thin film transistor) structures, their modeling and extraction of performance parameters, materials of individual layers, their molecular structures, basics of pi-conjugated semiconducting materials and their properties, OTFT charge transport phenomena and fabrication techniques. It includes applications of OTFTs such as single and dual gate OTFT based inverter circuits along with bootstrap techniques, SRAM cell designs based on different material and circuit configurations, light emitting diodes (LEDs). Besides this, application of dual gate OTFT in the logic gate, shift register, Flip-Flop, counter circuits will be included as well.
Author: Flora Li
Publisher: John Wiley & Sons
ISBN: 3527634452
Category : Technology & Engineering
Languages : en
Pages : 258
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Book Description
Research on organic electronics (or plastic electronics) is driven by the need to create systems that are lightweight, unbreakable, and mechanically flexible. With the remarkable improvement in the performance of organic semiconductor materials during the past few decades, organic electronics appeal to innovative, practical, and broad-impact applications requiring large-area coverage, mechanical flexibility, low-temperature processing, and low cost. Thus, organic electronics appeal to a broad range of electronic devices and products including transistors, diodes, sensors, solar cells, lighting, displays, and electronic identification and tracking devices A number of commercial opportunities have been identified for organic thin film transistors (OTFTs), ranging from flexible displays, electronic paper, radio-frequency identification (RFID) tags, smart cards, to low-cost disposable electronic products, and more are continually being invented as the technology matures. The potential applications for "plastic electronics" are huge but several technological hurdles must be overcome. In many of these applications, transistor serves as a fundamental building block to implement the necessary electronic functionality. Hence, research in organic thin film transistors (OTFTs) or organic field effect transistors (OFETs) is eminently pertinent to the development and realization of organic electronics. This book presents a comprehensive investigation of the production and application of a variety of polymer based transistor devices and circuits. It begins with a detailed overview of Organic Thin Film Transistors (OTFTs) and discusses the various possible fabrication methods reported so far. This is followed by two major sections on the choice, optimization and implementation of the gate dielectric material to be used. Details of the effects of processing on the efficiency of the contacts are then provided. The book concludes with a chapter on the integration of such devices to produce a variety of OTFT based circuits and systems. The key objective is to examine strategies to exploit existing materials and techniques to advance OTFT technology in device performance, device manufacture, and device integration. Finally, the collective knowledge from these investigations facilitates the integration of OTFTs into organic circuits, which is expected to contribute to the development of new generation of all-organic displays for communication devices and other pertinent applications. Overall, a major outcome of this work is that it provides an economical means for organic transistor and circuit integration, by enabling the use of a well-established PECVD infrastructure, while not compromising the performance of electronics. The techniques established here are not limited to use in OTFTs only; the organic semiconductor and SiNx combination can be used in other device structures (e.g., sensors, diodes, photovoltaics). Furthermore, the approach and strategy used for interface optimization can be extended to the development of other materials systems.
