Radio frequency rectifiers based on organic thin-film transistors

Rotzoll, Robert; Mohapatra, Siddharth; Olariu, Viorel; Wenz, Robert; Grigas, Michelle; Dimmler, Klaus; Shchekin, O.B.; Dodabalapur, Ananth

doi:10.1063/1.2186384

Cited by 217 publications

(111 citation statements)

References 11 publications

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“…More 12PTTP12 molecules were deposited on the wafer, which increased the film thickness and decreased its initial I SD in N 2 from 130 to 90 μA. The 12PTTP12 OFET still showed negligible response with I SD decreased by 4 μA upon exposure to 1 ppm NH 3 . The changes of I SD of four OFETs with equal layer at various V G were summarized in Fig.…”

Section: Electronic Performances and Sensing Testsmentioning

confidence: 93%

“…As the alkyl chain length increased, more OSC molecules arranged in a fixed direction on the OTSmodified silicon wafer, resulting in better π-π stacking, higher degree of crystallinity and the increase of output current. However, the longest alkyl chain of 12PTTP12 obstructed the interaction of NH 3 with charges, which led to the lowest sensitivity of 12PTTP12 OFET to 1 ppm NH 3 . length forms the film with high order of molecular arrangement and effective response to 1 ppm NH 3 .…”

Section: Electronic Performances and Sensing Testsmentioning

confidence: 99%

“…Organic field-effect transistors (OFETs) have been investigated extensively for applications such as display drivers, radio frequency identification tags, and circuits of moderate complexity [1][2][3][4][5][6]. Another compelling application of OFET is chemical and biological sensing [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Side-chain effect of organic semiconductors in OFET-based chemical sensors

Liu

Huang

2017

Sci. China Mater.

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Organic field-effect transistors (OFETs) offer great potential applications in chemical and biological sensing for homeland security, environmental monitoring, industry manufacturing, and medical/biological detection. Many studies concentrate on sensitivity and selectivity improvement of OFET-based sensors. We report four organic semiconductors with different alkyl side chain lengths but the same π-conjugated core structure for OFETs. Our work focuses on the molecular structure of organic semiconductors (OSCs). Alkyl side chains can hinder the diffusion of ammonia into the OSCs layer, which blocks the interaction between ammonia and conducting channel. The result also reveals the relationship between the alky chain and the film thickness in sensitivity control. These results are expected to be a guide to the molecular design of organic semiconductors and the choice of OSCs.

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Section: Electronic Performances and Sensing Testsmentioning

confidence: 93%

Section: Electronic Performances and Sensing Testsmentioning

confidence: 99%

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Side-chain effect of organic semiconductors in OFET-based chemical sensors

Liu

Huang

2017

Sci. China Mater.

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“…[1][2][3][4] The development of high-performance OTFTs has progressed significantly; the mobility (>1 cm 2 /Vs) and on/off current ratio (>10 5 ) of these OTFTs are comparable with those of amorphous silicon thin film transistors (TFTs). [5][6][7][8] In practice, however, OTFTs remain problematic in terms of the high threshold voltage (V T ; a few tens of volts).…”

Section: Introductionmentioning

confidence: 97%

Remarkable reduction in the threshold voltage of pentacene-based thin film transistors with pentacene/CuPc sandwich configuration

Liu

Cai

et al. 2014

AIP Advances

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This study investigates the remarkable reduction in the threshold voltage (VT) of pentacene-based thin film transistors with pentacene/copper phthalocyanine (CuPc) sandwich configuration. This reduction is accompanied by increased mobility and lowered sub-threshold slope (S). Sandwich devices coated with a 5 nm layer of CuPc layer are compared with conventional top-contact devices, and results indicate that VT decreased significantly from −20.4 V to −0.2 V, that mobility increased from 0.18 cm2/Vs to 0.51 cm2/Vs, and that S was reduced from 4.1 V/dec to 2.9 V/dec. However, the on/off current ratio remains at 105. This enhanced performance could be attributed to the reduction in charge trap density by the incorporated CuPc layer. Results suggest that this method is simple and effectively generates pentacene-based organic thin film transistors with high mobility and low VT.

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“…It is envisaged that they will have enormous market in a wide range of applications, for example as the driving elements for flexible displays, radio-frequency identification tags and large area sensors [1][2][3]. Previous investigations on organic TFTs have focused on materials [4], interfacial properties [5], source/drain contact engineering [6] and processing techniques [7], to enhance the TFT performance.…”

Section: Introductionmentioning

confidence: 99%

Pentacene Thin-Film Transistors with Hydrophobic Nanostructures on a Polymeric Gate Insulator

Kim¹,

Lee²,

Park³

2015

Int J Metall Mater Eng

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The effects of hydrophobic nanostructures on the growth of pentacene molecules and the electrical characteristics of pentacene thin-film transistors (TFTs) are investigated. X-ray diffraction results show that hydrophobic nanostructures are conducive to the upright growth of pentacene molecules to the substrate. Pentacene TFTs, in which hydrophobic nanostructures with a cowl shape were introduced at the interface between the pentacene layer and the gate insulator, thus exhibit a pronounced enhancement in the field-effect mobility, up to approximately 2.94 cm 2 /Vs. These results suggest that hydrophobic nanostructures are effective to the ordered growth of pentacene molecules for high-performance organic TFTs. Pentacene Thin-Film Transistors with Hydrophobic Nanostructures on a Polymeric Gate Insulator Keywords:Organic semiconductor, Thin-film transistor, Molecular ordering Research ArticleOpen Access IntroductionOrganic thin-film transistors (TFTs) are attracting much interest because of their simple and low-temperature process ability. It is envisaged that they will have enormous market in a wide range of applications, for example as the driving elements for flexible displays, radio-frequency identification tags and large area sensors [1][2][3]. Previous investigations on organic TFTs have focused on materials [4], interfacial properties [5], source/drain contact engineering [6] and processing techniques [7], to enhance the TFT performance. Among the characteristic parameters, the field-effect mobility is known to be greatly influenced by the deposition conditions and consequent crystallinity of organic semiconductors. Likewise, the chemical and morphological properties of a gate insulator are deemed decisive to the field-effect mobility in bottom-gate organic TFTs by influencing the crystalline growth of an organic semiconductor. Several works have shown that the rough surface of a gate insulator causes a reduction in the field-effect mobility [5,8]. In contrast, recent studies reported that the crystalline growth of organic semiconductors and the performance of organic TFTs can be improved by introducing structured morphologies on the surface of a gate insulator [9,10], which motivates our research into cowl-shaped nanostructures for application in organic TFTs.In this study, we show that hydrophobic nanostructures with a cowl shape facilitate the upright growth of pentacene molecules to the substrate. The influence of hydrophobic cowl-shaped nanostructures on the morphological and structural characteristics of pentacene films are investigated. The enhancement in the field-effect mobility of pentacene-based TFTs fabricated with these nanostructures is reported. Experimental ProcedureTo fabricate pentacene TFTs, a 150-nm-thick Al gate was deposited on a glass substrate using the first shadow mask. Poly (4-vinylphenol) (PVP) with a cross-linking agent was spin-coated on the gate-patterned substrates and baked consecutively at 175°C for 1 h in a vacuum oven. A 480-nm-thick layer of cross-linked PVP (cP...

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Radio frequency rectifiers based on organic thin-film transistors

Cited by 217 publications

References 11 publications

Side-chain effect of organic semiconductors in OFET-based chemical sensors

Side-chain effect of organic semiconductors in OFET-based chemical sensors

Remarkable reduction in the threshold voltage of pentacene-based thin film transistors with pentacene/CuPc sandwich configuration

Pentacene Thin-Film Transistors with Hydrophobic Nanostructures on a Polymeric Gate Insulator

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