By Dr. Flora M. Li, Prof. Arokia Nathan, Dr. Yiliang Wu, Prof. Beng S. Ong(auth.)
Examine on natural electronics (or plastic electronics) is pushed by means of the necessity to create platforms which are light-weight, unbreakable, and automatically versatile. With the extraordinary development within the functionality of natural semiconductor fabrics in the past few a long time, natural electronics entice cutting edge, functional, and broad-impact purposes requiring large-area assurance, mechanical flexibility, low-temperature processing, and occasional fee. therefore, natural electronics entice a vast variety of digital units and items together with transistors, diodes, sensors, sun cells, lighting fixtures, monitors, and digital identity and monitoring units a couple of advertisement possibilities were pointed out for natural skinny movie transistors (OTFTs), starting from versatile screens, digital paper, radio-frequency id (RFID) tags, clever playing cards, to reasonably cheap disposable digital items, and extra are constantly being invented because the know-how matures. the aptitude purposes for ?plastic electronics? are large yet numerous technological hurdles has to be triumph over. in lots of of those functions, transistor serves as a primary construction block to enforce the required digital performance. as a result, study in natural skinny movie transistors (OTFTs) or natural box influence transistors (OFETs) is eminently pertinent to the advance and recognition of natural electronics. This booklet offers a accomplished research of the construction and alertness of a number of polymer dependent transistor units and circuits. It starts off with a close evaluation of natural skinny movie Transistors (OTFTs) and discusses some of the attainable fabrication equipment mentioned to date. this is often by means of significant sections at the selection, optimization and implementation of the gate dielectric fabric for use. information of the results of processing at the potency of the contacts are then supplied. The ebook concludes with a bankruptcy at the integration of such units to provide a number of OTFT dependent circuits and platforms. the most important aim is to envision options to use current fabrics and methods to increase OTFT know-how in machine functionality, equipment manufacture, and equipment integration. ultimately, the collective wisdom from those investigations allows the combination of OTFTs into natural circuits, that's anticipated to give a contribution to the advance of latest new release of all-organic screens for conversation units and different pertinent purposes. total, an immense consequence of this paintings is that it offers a cost-effective potential for natural transistor and circuit integration, via permitting using a well-established PECVD infrastructure, whereas now not compromising the functionality of electronics. The suggestions confirmed listed here are no longer restricted to take advantage of in OTFTs in basic terms; the natural semiconductor and SiNx mixture can be utilized in different equipment buildings (e.g., sensors, diodes, photovoltaics). moreover, the process and method used for interface optimization will be prolonged to the improvement of alternative fabrics systems.Content:
Chapter 1 advent (pages 1–11):
Chapter 2 natural skinny movie Transistor (OTFT) evaluation (pages 13–53):
Chapter three OTFT Integration thoughts (pages 55–100):
Chapter four Gate Dielectrics via Plasma more desirable Chemical Vapor Deposition (PECVD) (pages 101–145):
Chapter five Dielectric Interface Engineering (pages 147–183):
Chapter 6 touch Interface Engineering (pages 185–207):
Chapter 7 OTFT Circuits and structures (pages 209–237):
Chapter eight Outlook and destiny demanding situations (pages 239–243):
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Extra resources for Organic Thin Film Transistor Integration: A Hybrid Approach
3. 1, the functional device layers are the semiconductor, the gate dielectric, and the electrodes. Since these layers are actively involved in the operation of OTFTs, the choice of materials and the compatibility between materials inﬂuence device performance. 17 depicts the key interaction mechanisms between various device layers. There are two additional material layers that require consideration for OTFT fabrication: the substrate and the encapsulation. The substrate presents a platform for material deposition; in the case of organic electronics, there is an application-driven aspiration toward ﬂexible substrates.
If P3HT consists of both HH and HT moieties, it is ‘‘regiorandom’’; if only one type of arrangement is present (either HH or HT), it is ‘‘regioregular’’. High regioregularity is critical for higher molecular ordering, and thus high mobility, in polymer OTFTs. In contrast, regiorandom P3HT ﬁlms usually yield lower mobility due to a higher degree of disorder in the regiorandom structure [26, 28]. Alternative techniques to improve the mobility of P3HT OTFT have also been reported, including optimizing the choice of solvent, thermal annealing, optimizing the chain length, and using chemical treatment of the substrate surface prior to deposition of the polymer semiconductor ﬁlm [14, 28, 29].
Many polymer semiconductors easily absorb oxygen and water molecules in air, and often become increasingly p-type doped. As a result of (photo-induced) oxidative doping, the free carrier density increases and the conductivity of the material increases . The uncontrolled increase in conductivity can lead to severe deterioration of the performance of OTFTs, possibly resulting in a higher off-current and lower on/off current ratio. Abdou et al.  studied the interaction of oxygen with conjugated polymers and observed that oxygen forms a reversible CTC with the polymer.