Hall-effect mobility of pentacene films prepared by the thermal evaporating method with different substrate temperature

Lin, Yow−Jon; Tsao, Hou-Yen; Liu, Day-Shan

doi:10.1063/1.4733293

Cited by 20 publications

(6 citation statements)

References 19 publications

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“…Pentacene crystals and polycrystalline films exhibited room-temperature hole mobilities of up to 40 cm 2 /(Vs) in crystals and values ranging from 5.5 cm 2 /(Vs) (in TFTs) to ∼11 cm 2 /(Vs) (from Hall effect) and to 21 cm 2 /(Vs) (from THz spectroscopy) in films. Observations of “bandlike” dμ/d T < 0 behavior were made in optical pump-THz probe experiments, ,,, in Hall effect measurements, and in devices (Table ). Mobility anisotropy of up to a factor of 3.5 was observed in single-crystal FETs .…”

Section: Charge Transportmentioning

confidence: 99%

Organic Optoelectronic Materials: Mechanisms and Applications

2016

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Organic (opto)electronic materials have received considerable attention due to their applications in thin-film-transistors, light-emitting diodes, solar cells, sensors, photorefractive devices, and many others. The technological promises include low cost of these materials and the possibility of their room-temperature deposition from solution on large-area and/or flexible substrates. The article reviews the current understanding of the physical mechanisms that determine the (opto)electronic properties of high-performance organic materials. The focus of the review is on photoinduced processes and on electronic properties important for optoelectronic applications relying on charge carrier photogeneration. Additionally, it highlights the capabilities of various experimental techniques for characterization of these materials, summarizes top-of-the-line device performance, and outlines recent trends in the further development of the field. The properties of materials based both on small molecules and on conjugated polymers are considered, and their applications in organic solar cells, photodetectors, and photorefractive devices are discussed.

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Section: Charge Transportmentioning

confidence: 99%

Organic Optoelectronic Materials: Mechanisms and Applications

2016

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“…For example, if one wishes to use a charge-hopping approach within Marcus theory, the mobility can be predicted from the transfer integral between nearest neighbor molecules and the reorganization energy of the isolated molecule, − an approach that can be easily implemented to screen thousands of molecules . Unfortunately, there are serious limitations with describing charge transport via a hopping approach, and the large reported mobility with the evidence of Hall effects , suggests that the charge propagates coherently. A family of alternative models have emerged based on the observation that the transfer integral undergoes large fluctuations because of thermal motions. − This effect, known as dynamic disorder, is due to the strong modulation of the transfer integral by low-frequency molecular phonons, that is, it is a manifestation of the nonlocal electron–phonon coupling.…”

Section: Introductionmentioning

confidence: 99%

Rapid Evaluation of Dynamic Electronic Disorder in Molecular Semiconductors

Landi

Troisi

2018

J. Phys. Chem. C

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One of the key factors limiting the charge mobility of molecular semiconductors is the fluctuation of transfer integrals, also known as dynamic disorder. This is a manifestation of the nonlocal electron−phonon coupling, a property that is computationally expensive to evaluate and, so far, prevented the study of this property on large datasets of molecules. In this article, we describe a methodology for the fast evaluation of the dynamic electronic disorder for molecular semiconductors from their crystalline structure. The computation is accelerated by (i) the evaluation of the Cartesian gradient of transfer integral and (ii) the use of approximate phonons evaluated within the rigid body approximation. The quality of the approximations is checked against lessapproximated alternatives. This method is used to study a range of molecular crystals, and some general trends on the behavior of the nonlocal electron−phonon coupling are discussed. A strategy to find the optimal relative position between interacting molecules is proposed.

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“…Unlike the MOSFET based on crystalline silicon, there are many defects in the conducting layer of OTFT. The charge transport mechanisms in organic materials have been described by Coropceanuet et al 28 and Lin et al 29 The polaron models have been employed to explain the transport mechanism, in which the total carrier mobility can be expressed to a good approximation as a sum of two contributions,…”

Section: Resultsmentioning

confidence: 99%

A low-frequency noise model with carrier generation-recombination process for pentacene organic thin-film transistor

Han

Qian

Leung

et al. 2013

Journal of Applied Physics

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By including the generation-recombination process of charge carriers in conduction channel, a model for low-frequency noise in pentacene organic thin-film transistors (OTFTs) is proposed. In this model, the slope and magnitude of power spectral density for low-frequency noise are related to the traps in the gate dielectric and accumulation layer of the OTFT for the first time. The model can well fit the measured low-frequency noise data of pentacene OTFTs with HfO 2 or HfLaO gate dielectric, which validates this model, thus providing an estimate on the densities of traps in the gate dielectric and accumulation layer. It is revealed that the traps in the accumulation layer are much more than those in the gate dielectric, and so dominate the low-frequency noise of pentacene OTFTs. V C 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4816103] 044503-3 Han et al. J. Appl. Phys. 114, 044503 (2013) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 136.165.238.131 On: Mon, 22 Dec 2014 16:48:42 044503-4 Han et al. J. Appl. Phys. 114, 044503 (2013) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 136.165.238.131 On: Mon, 22 Dec 2014 16:48:42 044503-5 Han et al. J. Appl. Phys. 114, 044503 (2013) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 136.165.238.131 On: Mon, 22 Dec 2014 16:48:42 044503-6 Han et al.

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Hall-effect mobility of pentacene films prepared by the thermal evaporating method with different substrate temperature

Cited by 20 publications

References 19 publications

Organic Optoelectronic Materials: Mechanisms and Applications

Organic Optoelectronic Materials: Mechanisms and Applications

Rapid Evaluation of Dynamic Electronic Disorder in Molecular Semiconductors

A low-frequency noise model with carrier generation-recombination process for pentacene organic thin-film transistor

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