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Electronic Properties of Organic Thin Film Transistors with Nanoscale Tapered Electrodes

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Release : 2008
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Book Synopsis Electronic Properties of Organic Thin Film Transistors with Nanoscale Tapered Electrodes by : Jeongwon Park

Download or read book Electronic Properties of Organic Thin Film Transistors with Nanoscale Tapered Electrodes written by Jeongwon Park. This book was released on 2008. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Nanoscale Organic Thin Film Transistors

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Release : 2006
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Book Synopsis Nanoscale Organic Thin Film Transistors by : Yuanjia Zhang

Download or read book Nanoscale Organic Thin Film Transistors written by Yuanjia Zhang. This book was released on 2006. Available in PDF, EPUB and Kindle. Book excerpt:

Organic Thin Film Transistor Integration

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Release : 2011-03-21
Genre : Technology & Engineering
Kind : eBook
Book Rating : 452/5 ( reviews)

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Book Synopsis Organic Thin Film Transistor Integration by : Flora Li

Download or read book Organic Thin Film Transistor Integration written by Flora Li. This book was released on 2011-03-21. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Organic Thin-Film Transistor Applications

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Release : 2016-09-15
Genre : Technology & Engineering
Kind : eBook
Book Rating : 556/5 ( reviews)

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Book Synopsis Organic Thin-Film Transistor Applications by : Brajesh Kumar Kaushik

Download or read book Organic Thin-Film Transistor Applications written by Brajesh Kumar Kaushik. This book was released on 2016-09-15. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Chemical Approaches for Improved Nanoscale Organic and Polymer Thin-film Transistors (TFTs)

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Release : 2022
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Book Synopsis Chemical Approaches for Improved Nanoscale Organic and Polymer Thin-film Transistors (TFTs) by : Calla Mae McCulley

Download or read book Chemical Approaches for Improved Nanoscale Organic and Polymer Thin-film Transistors (TFTs) written by Calla Mae McCulley. This book was released on 2022. Available in PDF, EPUB and Kindle. Book excerpt: 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

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