Topic
Pentacene
About: Pentacene is a research topic. Over the lifetime, 5051 publications have been published within this topic receiving 161481 citations. The topic is also known as: 2,3:6,7-dibenzanthracene & benzo[b]naphthacene.
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TL;DR: In this article, a low-voltage pentacene organic field effect transistors are demonstrated with high-κ hafnium dioxide gate dielectrics grown by atomic layer deposition at 200 °C.
Abstract: Low-voltage pentacene organic field-effect transistors are demonstrated (operating voltage of −3 V) with high-κ hafnium dioxide gate dielectrics grown by atomic layer deposition at 200 °C. A high hole mobility of 0.39 cm2/V s with low threshold voltage (<−0.5 V) and low subthreshold slope of 120 mV/dec is achieved with a HfO2 dielectric layer modified with a phosphonic acid based treatment. A high value of 94.8 nF/V s is obtained for the product of mobility and capacitance density. The devices show excellent bias stress stability with or without the phosphonic acid at the HfO2 gate dielectric surface.
51 citations
TL;DR: In this article, the morphological properties prevail over crystal lattice organization in determining the cause for the observed sensitivity of organic semiconductors to mechanical deformation in Organic Thin Film Transistors (OTFTs).
51 citations
TL;DR: In this article, a set of criteria to distinguish between chemisorption and physiscorption beyond the total bond energy argument is discussed. But the results for complex π-conjugated organic molecules are limited.
Abstract: A detailed understanding of the organic molecule/substrate interface is of crucial importance for the design of organic semiconducting devices, as the interface determines the contact resistance and the charge injection. Generally, two different adsorption situations are considered: physisorption and chemisorption. For small molecular adsorbates like CO or N2, the adsorption energy alone can be used as a criterion to classify the adsorption in chemisorption (adsorption energies larger than 1 eV) and physisorption (few tens of meV). This classification fails for complex π-conjugated organic molecules. Here we discuss on the basis of a pentacene/Cu(110) model system a different set of criteria to distinguish between chemisorption and physisorption beyond the total bond energy argument. We analyze the bonding situation on the basis of density functional theory (DFT) calculations and photoelectron spectroscopy. Theory predicts (i) a significant bending of the molecule after adsorption, (ii) a buckling of the ...
51 citations
TL;DR: Evidence is presented that the strong coupling to low frequency motions is the factor limiting the conductivity in pentacene single crystals, which explains the apparent paradox of the "bandlike" temperature dependence of the Conductivity beyond the validity limit of the band model.
Abstract: Terahertz transient conductivity measurements are performed on pentacene single crystals, which directly demonstrate a strong coupling of charge carriers to low frequency molecular motions with energies centered around 1.1 THz. We present evidence that the strong coupling to low frequency motions is the factor limiting the conductivity in these organic semiconductors. Our observations explain the apparent paradox of the “bandlike” temperature dependence of the conductivity beyond the validity limit of the band model.
51 citations
TL;DR: The structure of pentacene thin films in the bulk phase having interplane spacing of d(001)=1.44nm was investigated using grazing-incidence x-ray diffraction as mentioned in this paper.
Abstract: The structure of pentacene thin films in the bulk phase having interplane spacing of d(001)=1.44nm grown on SiO2 was investigated using grazing-incidence x-ray diffraction. The films were prepared with two different methods: one treated with an organic solvent after vacuum deposition and the other thermally treated. Both films are similar in structure to the single crystal reported by Campbell et al. [Acta Crystallogr. 15, 289 (1962)].
51 citations