Origin of Bias-Stress Induced Instability in Organic Thin-Film Transistors with Semiconducting Small-Molecule/Insulating Polymer Blend Channel

Park, Ji Hoon; Lee, Young Tack; Lee, Hee Sung; Lee, Jun Young; Lee, Kimoon; Lee, Gyu Baek; Han, Jiwon; Kim, Tae‐Woong; Im, Seongil

doi:10.1021/am3022703

Cited by 31 publications

(20 citation statements)

References 31 publications

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“…During periods of UV exposure (i.e., the shaded areas in Figure 4a,b), both types of devices maintained relatively constant current levels. This implies that the number of both electrons and holes trapped at the PMMA/OSC interface of each UV light-exposed device was not exceptionally large in these devices, even though the PMMA-based organic fieldeffect transistors were reported to have hole trapping properties [30,31]. After the UV light was turned off, the drain current immediately returned to its initial state.…”

Section: Resultsmentioning

confidence: 98%

Enhanced Optical Switching Characteristics of Organic Phototransistor by Adopting Photo-Responsive Polymer in Hybrid Gate-Insulator Configuration

Park

Kim

2020

Polymers

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In this study, we developed polymer gate insulator-based organic phototransistors (p-OPTs) with improved optical switching properties by using a hybrid gate insulator configuration. The hybrid gate insulator of our p-OPT has a photoresponsive layer made of poly(4-vinylphenol) (PVP), which enhances the photoresponse, and an interfacial layer of poly(methyl methacrylate) for reliable optical switching of the device. Our hybrid gate insulator-equipped p-OPT exhibits well-defined optical switching characteristics because no specific type of charge is significantly trapped at an interfacial layer/organic semiconductor (OSC) interface. Moreover, our device is more photoresponsive than the conventional p-OPT (here, an OPT with a single-polymer poly(methyl methacrylate) (PMMA) gate insulator), because the characteristic ultraviolet (UV) absorption of the PVP polymer allows the photoresponsive layer and OSC to contribute to the generation of charge carriers when exposed to UV light.

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Section: Resultsmentioning

confidence: 98%

Enhanced Optical Switching Characteristics of Organic Phototransistor by Adopting Photo-Responsive Polymer in Hybrid Gate-Insulator Configuration

Park

Kim

2020

Polymers

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“…Photoexcited charge‐collection spectroscopy (PECCS) is a powerful method for the direct probing of the interfacial traps that arise between the OSC layer and the gate dielectric layer . PECCS can be used to measure the gradual recovery of the V th shift under monochromatic illumination.…”

Section: Experimental Methods For Investigating Charge Trapsmentioning

confidence: 99%

“…By using PECCS, Im and co‐workers have succeeded to quantify the interfacial trap states in various organic and inorganic semiconductor FETs, such as pentacene, poly(3‐hexylthiophene), poly(3,3'''‐didodecylquaterthiophene), and poly(didodecyl‐quaterthiophene‐ alt ‐didodecylbithiazole), TIPS‐pentacene, and zinc oxide (ZnO) . Recently, Kang et al utilized PECCS for n‐type conjugated polymer OFETs to investigate the correlation between the orientation of conjugated molecules and the bias stress stability .…”

Section: Experimental Methods For Investigating Charge Trapsmentioning

confidence: 99%

Recent Advances in the Bias Stress Stability of Organic Transistors

Park

Kim

Choi

et al. 2019

Adv Funct Materials

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In this progress report, recent advances in the development of organic transistors with superior bias stress stability and in the understanding of the charge traps that degrade device performance under prolonged bias stress are reviewed, with a particular focus on materials science and engineering methods. The phenomenological aspects of bias stress effects and the experimental methods for investigating charge traps are described. The recent progress in the bias stress stability of organic transistors is discussed in terms of those components that are the main focus of attempts to improve bias stress stability, i.e., organic semiconductor layers, gate dielectrics, and source/drain contacts. A brief summary of this progress is presented and the outlook for future research in this field is assessed. This report aims to summarize recent progress in this field and to provide some guidelines for studying bias stress-induced charge-trapping phenomena.

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“…Second, the amorphous polymers can introduce both lateral and vertical phase segregation between the polymers and semiconductors [45]. For example, various polymers have been reported to cause vertical phase segregation with the organic semiconductors, including poly(methyl methacrylate) (PMMA) [46][47][48], poly (alpha-methylstyrene) (PαMS) [49][50][51][52][53][54][55][56], polystyrene (PS) [57][58][59], and poly(triarylamine) (PTAA) [60][61][62][63][64]. A group of polymers, including poly(ethyl acrylate) (PEA), poly(butylacrylate) (PBA), and poly(2-ethylhexyl acrylate) (P2EHA), were reported with the capability to switch between lateral phase segregation and vertical phase segregation [45].…”

Section: Comparison Of Various Additives 211 Polymeric Additivesmentioning

confidence: 99%

Nanoparticles for organic electronics applications

Zhang

2020

Mater. Res. Express

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Recently, the research in solution-based, small-molecule organic semiconductors has achieved great progress, although their application in organic electronics devices is still restricted by a variety of issues, including crystal misorientation, morphological nonuniformity and low charge-carrier mobility. In order to overcome these issues, hybrid material systems that incorporate both organic semiconductors and additives have been successfully demonstrated to control crystal growth and charge transport of the organic semiconductors. In this work, we first review the recent advances in the charge-carrier mobility of the organic semiconductors, followed by a comparison of the different additives that have been reportedly blended with the semiconductors, including polymeric additives, small-molecule additives and nanoparticle based additives. Then we will review the important nanoparticles employed as additives to blend with solution-based, organic semiconductors, which effectively improved the semiconductor crystallization, enhanced film uniformity and increased charge transport. By discussing specific examples of various well-known organic semiconductors such as 6, 13-bis (triisopropylsilylethynyl) pentacene (TIPS pentacene), we demonstrate the essential relationship among the crystal growth, semiconductor morphology, dielectric properties, and chargecarrier mobilities. This work sheds light on the implementation of nanoparticle additives in highperformance organic electronics device application. the application of the organic semiconductor in thin-film transistor and other electronics device fabrication. Throughout the discussion of these specific examples that mainly involve small-molecule organic semiconductors, we showcase that this work can be used to control the crystallization and electrical performance of other newly-discovered, high-performance, semiconducting materials. Advances in organic electronicsIn this section, we will review the various advances in charge-carrier mobilities and device application that have been recently achieved in the field of organic electronics. The following discussion will be mainly focused on various solution-processed, small-molecule, organic semiconductors.The mobilities in solution-processed, small-molecule, organic semiconductors have been reported to be compared to or even far surpass the mobility of amorphous silicon. For example, Asare-Yeboah et al developed a temperature-based method which exposed the substrate to a gradient temperature and induced a solubility difference of a p-type small-molecule semiconductor 6, 13-bis (triisopropylsilylethynyl) pentacene (TIPS pentacene) [18]. TIPS pentacene crystals grew from the lower temperature side of the substrate towards the higher temperature side, forming well-aligned ribbons across the whole substrate. A mobility of up to 0.5 cm 2 V −1 s −1 has been reported from the TIPS pentacene OTFTs based on an ITO/PET flexible substrate by using the temperature-based alignment technique. Wade et al demonstrated a zone casting metho...

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Origin of Bias-Stress Induced Instability in Organic Thin-Film Transistors with Semiconducting Small-Molecule/Insulating Polymer Blend Channel

Cited by 31 publications

References 31 publications

Enhanced Optical Switching Characteristics of Organic Phototransistor by Adopting Photo-Responsive Polymer in Hybrid Gate-Insulator Configuration

Enhanced Optical Switching Characteristics of Organic Phototransistor by Adopting Photo-Responsive Polymer in Hybrid Gate-Insulator Configuration

Recent Advances in the Bias Stress Stability of Organic Transistors

Nanoparticles for organic electronics applications

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