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Thin-film transistor

About: Thin-film transistor is a research topic. Over the lifetime, 48425 publications have been published within this topic receiving 680879 citations. The topic is also known as: TFT.


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Patent
18 Mar 1992
TL;DR: In this article, a gate electrode of a thin film transistor, a channel formation layer, a power source terminal, and connection patterns of each word transistor to bit lines by a metal layer with polycrystal silicon layers from the first to the fourth was constructed.
Abstract: PURPOSE:To further enhance the degree of higher integration by consisting a gate electrode of a thin film transistor, a channel formation layer, a power source terminal, and connection patterns of each word transistor to bit lines by a metal layer with polycrystal silicon layers from the first to the fourth CONSTITUTION:Under lamination structure adopted herein, a first polycrystal silicon 11 to a fourth polycrystal silicon layer 14 and a conductive layer 15 are laminated In the first polycrystal silicon layer 11, each gate electrode for switching transistors Q3 and Q4 are installed on each semiconductor base board 1 On the first to the fourth polycrystal silicon layers 12 to 14, one of the respective polycrystal silicon layers form gate electrodes GT1 and GT2 for thin film transistors TFT1 and TFT2 while one of the respective polycrystal semiconductor layers form a channel formation layer 15 for these transistors TFT1 and TFT2 Other polycrystal silicon layer forms a power source terminal VSS while a metal layer 15 forms a connection pattern of each work transistor Q1 and Q2 for bit caps B1 and B2 This construction makes it possible to enhance a higher degree of integration

124 citations

Journal ArticleDOI
TL;DR: In this paper, the authors found that spin coating a solution of 6,13-bis(triisopropyl-silylethynyl)-pentacene blended with poly(α-methylstyrene) (PαMS) induces vertical nanophase separation, which results in a trilayer film.
Abstract: We have found that spin coating a solution of 6,13-bis(triisopropyl-silylethynyl)-pentacene (TIPS-pentacene) blended with poly(α-methylstyrene) (PαMS) induces vertical nanophase separation, which results in a trilayer film: a TIPS-pentacene layer, a mixed layer of TIPS-pentacene/PαMS, and a TIPS-pentacene layer Organic thin-film transistors (TFTs) made from this TIPS-pentacene/PαMS solution have remarkably improved uniformity and thermal stability without degradation of electrical characteristics compared to organic TFTs with a conventional TIPS-pentacene sole channel layer

124 citations

Journal ArticleDOI
TL;DR: In this paper, a correlation between the size of the endgroup with respect to the inner semiconducting core of the molecule is found to be an important factor in orienting the molecules with their long axis perpendicular to the substrate surface in the thin film phase.
Abstract: Various cyclohexyl end-capped oligomeric semiconductors based on oligothiophene, oligothiophene-fluorene, and perylene diimide have been synthesized using Stille and Suzuki coupling. These materials exhibit increased solubility over their unsubstituted and hexyl-substituted counterparts and have been successfully employed as the active component in organic field-effect transistors. The morphology of vacuum-deposited films made with these oligomers has been investigated using atomic force microscopy (AFM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Field effect mobility as high as 0.17 cm2/V·s was observed in fluorene-thiophene oligomers deposited at elevated substrate temperatures. With the series of materials, a correlation between the size of the endgroup with respect to the size of the inner semiconducting core of the molecule is found to be an important factor in orienting the molecules with their long axis perpendicular to the substrate surface in the thin film phase, and di...

124 citations

Journal ArticleDOI
09 May 2011-Small
TL;DR: Here it is reported on the successful fabrication and detailed analysis of organic TFTs with channel lengths and gate overlaps of about 100 nm in which the short-channel effects are greatly suppressed by area-selective contact doping and by aggressive gate-dielectric scaling.
Abstract: Organic thin-fi lm transistors (TFTs) are of interest for electronic applications on fl exible plastic substrates, such as rollable or foldable active-matrix displays, [ 1 ] conformable sensor arrays, [ 2 ] and fl exible identifi cation tags. [ 3 ] Due to the relatively small intrinsic fi eld-effect mobility in most conjugated organic semiconductors ( 10 MHz) are highly desirable. Such high frequencies are indeed feasible, provided the lateral dimensions of the organic TFTs are suffi ciently small (about 100 nm). However, TFTs with such small lateral dimensions will suffer from a variety of detrimental short-channel effects, unless a number of important scaling requirements are observed in the design and fabrication of the transistors. Here we report on the successful fabrication and detailed analysis of organic TFTs with channel lengths and gate overlaps of about 100 nm in which the short-channel effects are greatly suppressed by area-selective contact doping (using a strong organic dopant) and by aggressive gate-dielectric scaling (using a 5.7 nm-thick, low-temperature-processed gate insulator based on a molecular self-assembled monolayer). As a result, these nanoscale organic TFTs have off-state drain currents below 1 pA, on/ off current ratios near 10 7 , as well as clean linear and saturation characteristics. The transconductance of these transistors reaches 0.4 S m − 1 , which is the largest transconductance reported for organic TFTs with patterned gate electrodes. The gate electrodes and source/drain contacts of organic TFTs are usually defi ned by photolithography, [ 1 , 3 , 4 ]

124 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a detailed investigation on the layer formation process during spray deposition of organic thin-films and its relation to solution properties and process parameters, and demonstrate that individual droplets in a spray-coated layer can behave to a certain extent as a continuous layer.

124 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023341
2022918
2021640
20201,333
20192,015
20182,080