Improvement in mobility and stability of ntype organic fieldeffect transistors with a hole transporting interfacial layer kenichi nakayama1. Highmobility organic thinfilm transistors based on a. We found different impacts to hole mobility in each material when the dopant concentration changes. Us8394665b2 organic thin film transistors, organic light. A solutioncrystallized transistor based on alkylated dnfv derivatives showed an excellent carrier mobility of up to 1.
Basic pn juncti on for oled application the oled structure is delimited by the metallic layer and the transparent conductor such as indium tin oxide itoglass interfaces. Organic semiconductors are solids whose building blocks are pibonded molecules or polymers made up by carbon and hydrogen atoms and at times heteroatoms such as nitrogen, sulfur and oxygen. Based on 2dqtts, the relationship between molecular structure, film microstructure, and charge. They present an interesting challenge for studying charge transport measurements. A test of polaron band theory naresh shakya, chandra pokhrel, brett ellman. High mobility emissive organic semiconductor jie liu 1,2, hantang zhang 1,2, huanli dong 1,2, lingqiang meng 3, longfeng jiang 4, lang jiang 5, ying w ang 3. This study may provide a universal route for the use of small organic molecules to achieve high performance in lamellar single crystal. Shinwoong kang, and satyendra kumar department of physics, kent state university yulia getmanenko and robert j. Organic thinfilm transistors tfts are of interest for a variety of largearea electronics applications. In order to avoid using a codeposited emissive layer, a solutionprocessed iridiumcored. They exist in form of molecular crystals or amorphous thin films. Light and flexible organic semiconductor materials are promising for foldable. Organic solar cellsreduce the cost of solar power by making use of inexpensive organic polymers rather than the expensive crystalline silicon used in most solar cells.
Even higher mobility would be achieved for polymers with enatiopure chiral side chain. An 11inch television, with a thickness of 3 mm, based on oled technology is currently available from sony, demonstrating that organic technology will be able to compete, in the near future, with the ones of liquidcrystal and plasma ones. We need an organic material with high mobility for highly drivable electronic circuits. The welldeveloped high mobility organic semiconductors oscs are considered to be excellent candidates for high performance ote materials. Thermoelectric transport properties of high mobility. Electron injection into organic semiconductor devices from high work function cathodes corey v. High mobility emissive organic semiconductor jie liu 1,2, hantang zhang 1,2, huanli dong 1,2, lingqiang meng 3, longfeng jiang 4, lang jiang 5, ying wang 3. The achievement of organic semiconductors with both high mobility and strong fluorescence emission remains a challenge. Twieg department of chemistry, kent state university. Recent advances in molecular design have led to polymer semiconductor materials that possess hole mobility values similar to that of amorphous silicon. High mobility emissive organic semiconductor nature. Flexible lowvoltage organic transistors based on a novel.
We present measurements of the seebeck coefficient in two high mobility organic small molecules, 2,7dioctyl1benzothieno3,2b1benzothiophene c 8btbt and 2,9didecyldinaphtho2,3b. The integration of high charge carrier mobility and high luminescence in an organic semiconductor is challenging. Organic transistor ofet materials tokyo chemical industry co. The interest in undoped organic semiconductors revived in the 1980s due to the demon stration of an ef. In this letter, we used space charge limited current measurements to evaluate the hole mobilities of candidate host materials with or without doped phosphorescent guests through a study of hole only devices. Although a variety of oscs have been explored as ote materials. An important difference between organic and conventional solar cells is the charge carrier mobility of the semiconductors, which tends to be relatively low in organic semiconductors. A free powerpoint ppt presentation displayed as a flash slide show on id. We postulated that the guesthost energy level matching in. High mobility emissive organic semiconductor jie liu 1,2, hantang zhang 1,2, huanli dong 1,2, lingqiang meng 3, longfeng jiang 4, lang jiang 5, ying wang 3, junsheng yu 4, yanming. Electron injection into organic semiconductor devices from.
Dielectric between the substrate and the semiconductor improves the mobility and the lifetime. Nowadays, organic semiconductors have found commercial application in organic lightemitting diodes oleds. High mobility organic semiconductors for fieldeffect. Semiconductor like properties are also found in organic compounds like polydiacetylene ch2n with conjugate carbon chains, fullerenes, nanotubes, bn nanotubes, etc. Effect of a highvacuum gauge on photoconductivity of pristine rubrene. Organic molecules can easily be tailored at the molecular level and tuned for applications. A highlyordered, high mobility organic semiconductor.
The first part introduces the design and demonstration of highperformance, lowvoltage flexible spofets fabricated on plastic substrates with a carrier mobility over 0. In contrast to the inorganic semiconductors, where charge carriers are delocalized and band model describes the charge transport rather well, charge carriers in oss are localized at one or several molecules because. High mobility emissive organic semiconductor nasaads. In general, they are electrical insulators, but become semiconducting when charges are either injected from. A method of manufacturing an organic thin film transistor, the method comprising. Hoven, renqiang yang, andres garcia, victoria crockett, alan j. An organic semiconductor device according to the present invention includes a semiconductor layer 14 interposed between two electrodes 12 and 15, and the semiconductor layer 14 contains a trioxotriangulene tot derivative, which is a neutral radical compound, as a semiconductor material. Organic semiconductors with high mobility and strong fluorescence are necessary for optoelectronic devices. Perylene bisimide compounds are promising ntype organic semiconductor having deep lumo levels and high crystallinity. High mobility organic thin film transistor and efficient photovoltaic devices using versatile donoracceptor polymer semiconductor by molecular design. Dpa is a high mobility emissive organic semiconductor with potential in organic optoelectronics. Improvement in mobility and stability of ntype organic.
Organic electronics vol 14, issue 4, pages 10211224 april 20. Organic optoelectronic devices including organic resonant tunneling diodes 1,2, oleds 3,4, organic phototransistors 5, organic photovoltaic cells 6, and organic photodetectors 7 have formed a tremendous area of research in chemistry and physics. Organic semiconductors oscs are the key components of ofets and basically determine the device performance. F8bt, tfb and pfb see supplemental information for chemical structures. The measurements are performed in a field effect transistor structure with high field effect mobilities of approximately 3 cm 2 v s.
Organic lightemitting diodes oleds based on dpa give pure blue emission with brightness up to 6,627 cd m. A few organic ntype semiconductors that can be used in fets are known, but these suffer from low electron mobility, poor stability in air andor demanding processing conditions8,9,10. Dnfv derivatives showed high emissive behaviour in solid. Asymmetric conjugated molecules based on 1benzothieno3,2b1benzothiophene for highmobility organic thinfilm transistors. Organic thermoelectric ote materials have attracted intensive attention because of their promising applications in flexible electricity generators and ultrathin solid cooling elements. In this study, we present optical simulation versus real fabricated device results in the microcavity red topemitting organic light emitting diodes teoleds. Us8933437b2 organic semiconductor material with neutral. Oled devices consist of a substrate and either an emissive layer eml, or more. The past five years have witnessed great progress of oscs. Here, two superior high mobility emissive organic semiconductors, 2,6. Transport in organic semiconductors has traditionally been investigated using measurements of the temperature and gate voltage dependent mobility of charge carriers within the channel of organic fieldeffect transistors ofets. Influence of high mobility polymer semiconductors in. A novel ptype organic semiconductor with high thermal stability is developed by simply incorporating cyclohexyl substituted aryl groups into the 2,6position of anthracene, namely 2,6di4cyclohexylphenylanthracene dchpa, and a similar compound with linear alkyl chain, 2,6di4nhexylphenylanthracene dnhpa, is also studied for comparison.
The semiconductor layer 14 acts as an ntype semiconductor and coacts with a p. Exploring thermoelectric materials from high mobility. Effect of hole mobilities through the emissive layer on. Organic semiconductor gaojie lu ece423 presentation 12162006 outline for organic semiconductor introduction to organic semiconductor relation of organic. Highmobility semiconducting naphthodithiophene copolymers. Organic lightemitting diodes oleds based on dpa give pure blue emission with brightness up to 6,627 cd m2 and turnon voltage of 2. The optical simulation results indicate that the two kinds of possible emissive layer eml positions exist in the second order microcavity effect and each emls could emit the similar radiance with near national. High efficiency red topemitting microcavity organic. Towards reliable chargemobility benchmark measurements. A test of polaron band theory naresh shakya, chandra pokhrel, brett ellman, shin woong kang, and satyen kumar department of physics, kent state university yulia getmanenko and robert j. High mobility emissive organic semiconductor jie liu 1,2, hantang zhang 1,2, huanli dong 1,2, lingqiang meng 3, longfeng jiang 4, lang jiang 5, ying w ang 3, junsheng y u 4, y anming. The annellation mode of the system allows for increased stability of the conjugated system relative to linear analogues due to the increased number of clar aromatic sextets. Ultrahigh charge carrier mobility in an organic semiconductor by vertical chain alignment thursday, march 31, 2016 the control of the electronic and optical properties of conjugated polymer thin films is of great interest for building more efficient solution processed organic electronic devices, e. High mobility solutionprocessed hybrid light emitting transistors bright walker,1,a mujeeb ullah,2,a gil jo chae,3,4 paul l.
High mobility solutionprocessed hybrid light emitting. Organic fieldeffect transistors ofets are attracting more and more attention due to their potential applications in lowcost, largearea and flexible electronic products. Moreover, it is beneficial for htms to have sufficiently high hole drift mobility 62. Electroluminescent devices based on organic materials are of.
Decoupling charge transport and electroluminescence in a. These exceptional characteristics are achieved by novel. Twieg department of chemistry, kent state university dated. Enhanced mobility in organic fieldeffect transistors due. A soluble and airstable organic semiconductor with high. Synthesis and applications for organic solar cells conjugated semiconductors have received more and more attention due to their intriguing electron and optoelectronic properties. For the semiconductor layer, three fluorenebased alternating copolymers were studied. A highlyordered, high mobility organic semiconductor grown from a mesophase. Cyclohexylsubstituted anthracene derivatives for high. With proper control of the dielectric surface, arrays of organic semiconductor single crystals can be patterned over a large area for high performance transistors. In particular, ptcdi with long alkyl chains bring about a highly ordered film struct ure, and very high electron mobility has been reported tatemichi et al.
The invention of an organic semiconductor with high mobility and strong emission opens the doors to the design and synthesis of additional novel organic semiconductors, coauthor huanli dong at. By attaching the appropriate solubilizing substituents. Developing high mobility emissive organic semiconductors towards. Simple charge transport model for efficient search of high. We report the synthesis and characterization of bistetracene, an unconventional, linearly extended conjugated core with eight fused rings. Ppt organic semiconductor powerpoint presentation free. Previous studies of similar materials have found hole transport to be relatively poor, and characterised by strong energetic disorder. Furan fused vshaped organic semiconducting materials with. Unipolar devices were also fabricated by adding high mobility charge.
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