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Organic semiconductor

About: Organic semiconductor is a research topic. Over the lifetime, 15905 publications have been published within this topic receiving 533881 citations.


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Journal ArticleDOI
TL;DR: In this article, gated four-probe measurements were designed to measure contact resistance in pentacene-based organic thin-film transistors (OTFTs) and the potential profiles as a function of contact metallurgy (Pt, Au, Ag, and Ca), substrate chemistry, VG, and temperature were investigated.
Abstract: We describe gated four-probe measurements designed to measure contact resistance in pentacene-based organic thin-film transistors (OTFTs) The devices consisted of metal source and drain electrodes contacting a 300-A-thick pentacene film thermally deposited on Al2O3 or SiO2 dielectrics with a p-doped Si substrate serving as the gate electrode Voltage-sensing leads extending into the source-drain channel were used to monitor potentials in the pentacene film while passing current during drain voltage (VD) or gate voltage (VG) sweeps We investigated the potential profiles as a function of contact metallurgy (Pt, Au, Ag, and Ca), substrate chemistry, VG, and temperature The contact-corrected linear hole mobilities were as high as 175cm2∕Vs and the film sheet resistance and specific contact resistance were as low as 600kΩ∕◻ and 13kΩ-cm, respectively, at high gate voltages In the temperature range of 50–200K, the pentacene OTFTs displayed an activated behavior with activation energies of 15–30meV Importa

295 citations

Journal ArticleDOI
TL;DR: In this paper, a model for anomalous magnetoresistance and its change with doping based on the charge transport in these semiconductors being electron-hole recombination limited was proposed.

294 citations

Journal ArticleDOI
26 Mar 1987-Nature
TL;DR: In this paper, a study of an organic polymer ferromagnetic preparation with a transition metal impurity content well below the level likely to significantly affect its magnetic properties is presented. But it is not shown that the impurity can significantly affect the magnetic properties of polymeric polymers.
Abstract: Low-dimensional, especially one-dimensional (1D), organic compounds are known to exhibit the properties of semiconductors, molecular metals and superconductors1. The theoretical prediction of 1D organic ferromagnets and the principles of construction of polymer polyradicals with a ground state spin proportional to a number of monomeric units were proposed in 1977–782,3. For nearly two decades various hydrocarbons of high spin multiplicity have been studied as the model of an organic ferromagnet4–6. Advanced quantum chemistry techniques have been applied for theoretical investigations of the electronic structure of such compounds7–9. Here we present a study of an organic polymer ferromagnetic preparation with a transition metal impurity content well below the level likely to significantly affect its magnetic properties. We find that all the organic polymer ferromagnet samples can be conditionally subdivided into three groups: paramagnetic polymers7–9, spin glasses10 and real polymer ferromagnets.

293 citations

Journal ArticleDOI
TL;DR: The results indicate that fluorobenzotriazole based 2D conjugated p-OSs are promising medium bandgap donors in the nonfullerene OSCs.
Abstract: In the last two years, polymer solar cells (PSCs) developed quickly with n-type organic semiconductor (n-OSs) as acceptor. In contrast, the research progress of nonfullerene organic solar cells (OSCs) with organic small molecule as donor and the n-OS as acceptor lags behind. Here, we synthesized a D–A structured medium bandgap organic small molecule H11 with bithienyl-benzodithiophene (BDTT) as central donor unit and fluorobenzotriazole as acceptor unit, and achieved a power conversion efficiency (PCE) of 9.73% for the all organic small molecules OSCs with H11 as donor and a low bandgap n-OS IDIC as acceptor. A control molecule H12 without thiophene conjugated side chains on the BDT unit was also synthesized for investigating the effect of the thiophene conjugated side chains on the photovoltaic performance of the p-type organic semiconductors (p-OSs). Compared with H12, the 2D-conjugated H11 with thiophene conjugated side chains shows intense absorption, low-lying HOMO energy level, higher hole mobility ...

293 citations

Journal ArticleDOI
TL;DR: In this article, the authors report on the fabrication of short-channel polymer organic thin-film transistors (OTFTs) using nano-imprint lithography, and the performance of these devices was studied as the channel length was reduced.
Abstract: We report on the fabrication of short-channel polymer organic thin-film transistors (OTFTs) using nanoimprint lithography. Currently, there is significant interest in OTFTs due to their potential application in inexpensive, large-area electronics. However, polymer carrier mobilities are typically poor, and thus to increase the OTFT drive current per unit area, there is a need for short-channel devices. We have fabricated working devices with channel lengths from 1 μm down to 70 nm with high yields. The performance of these devices was studied as the channel length was reduced. We find that drive current density increases as expected, while the on/off current ratio remains 104. However, at short-channel lengths, OTFTs no longer saturate due to space charge limiting current effects.

292 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023258
2022558
2021580
2020697
2019701
2018713