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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: The use of oligo ethylene glycol side chains is demonstrated to significantly improve the processability of the conjugated polymer p(g4 2T-T)-a polythiophene-in polar aprotic solvents, which facilitates coprocessing of dopant:polymer pairs from the same solution at room temperature.
Abstract: Molecular doping of organic semiconductors is critical for optimizing a range of optoelectronic devices such as field-effect transistors, solar cells, and thermoelectric generators. However, many dopant:polymer pairs suffer from poor solubility in common organic solvents, which leads to a suboptimal solid-state nanostructure and hence low electrical conductivity. A further drawback is the poor thermal stability through sublimation of the dopant. The use of oligo ethylene glycol side chains is demonstrated to significantly improve the processability of the conjugated polymer p(g4 2T-T)-a polythiophene-in polar aprotic solvents, which facilitates coprocessing of dopant:polymer pairs from the same solution at room temperature. The use of common molecular dopants such as 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) is explored. Doping of p(g4 2T-T) with F4TCNQ results in an electrical conductivity of up to 100 S cm(-1) . Moreover, the increased compatibility of the polar dopant F4TCNQ with the oligo ethylene glycol functionalized polythiophene results in a high degree of thermal stability at up to 150 °C.

174 citations

Journal ArticleDOI
TL;DR: Very bright and efficient white multilayer organic light-emitting devices based on 2-10-nm-thick layers of 0.25 and 0.5 wt.
Abstract: Very bright and efficient white multilayer organic light-emitting devices based on orange-emitting 2–10-nm-thick layers of 0.25 and 0.5 wt % rubrene-doped 4,4′-bis(2,2′-diphenylvinyl)-1,1′biphenyl are described. The color coordinates of all but one of the devices are well within the white region at 6–12 V, corresponding to a dynamic white brightness range of 30 dB. Their highest brightness Lmax was over 74 000 Cd/m2; in all devices Lmax exceeded 50 000 Cd/m2. The maximum efficiencies were 11.0 Cd/A, 6.0 lm/W, and 4.6% at 5.8 V, 0.6 mA/cm2, and 68 Cd/m2 in the 0.25 wt %, 2-nm-thick doped layer device. The color variation is attributed to either emission from different zones in devices with a thin doped layer, or saturation of emission sites due to relatively light doping.

173 citations

Journal ArticleDOI
TL;DR: In this paper, a hybrid system consisting of a triphenylamine core carrying π-conjugated terthienyl branches has been synthesized and characterized by differential scanning calorimetry, X-ray diffraction, cyclic voltammetry, UV−vis absorption and fluorescence spectroscopy.
Abstract: Two novel “hybrid” systems consisting of a triphenylamine core carrying π-conjugated terthienyl branches have been synthesized and characterized by differential scanning calorimetry, X-ray diffraction, cyclic voltammetry, UV−vis absorption, and fluorescence spectroscopy. The semiconductor potentialities of these compounds, which lead to glassy or amourphous films, have been evaluated by their implementation in very simple prototype devices that display electroluminescence at low voltage as well as a photovoltaic effect. Moreover, field-effect transistors based on one of these novel molecules display a high hole mobility (1.1 × 10-2 cm V-1 s-1). These results suggest that molecules leading to amorphous materials could represent a valid alternative as compared to systems that require control of the molecular orientation/organization.

173 citations

Patent
14 Nov 2005
TL;DR: In this article, the authors introduced new concepts into a structure of a conventional organic semiconductor element and without using a conventional ultra thin film, an organic semiconducting element is provided which is more reliable and has higher yield.
Abstract: By introducing new concepts into a structure of a conventional organic semiconductor element and without using a conventional ultra thin film, an organic semiconductor element is provided which is more reliable and has higher yield. Further, efficiency is improved particularly in a photoelectronic device using an organic semiconductor. Between an anode and a cathode, there is provided an organic structure including alternately laminated organic thin film layer (functional organic thin film layer) realizing various functions by making an SCLC flow, and a conductive thin film layer (ohmic conductive thin film layer) imbued with a dark conductivity by doping it with an acceptor and a donor, or by the like method.

173 citations

Journal ArticleDOI
TL;DR: In this paper, a grain-boundary barrier model with an energy distribution of interfacial traps is proposed to describe charge transport in polycrystalline organic thin films and applied to the interpretation of charge transport.
Abstract: We propose a grain-boundary barrier model with an energy distribution of interfacial traps to describe charge transport in polycrystalline organic thin films. The model is applied to the interpretation of charge transport in unintentionally doped pentacene films. It gives an acceptable explanation for the concomitant increase in threshold voltage and mobility, and allows an understanding of the difference between the dopant-concentration and gate-voltage dependences of the mobility.

172 citations


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