Experimental observation of the density of localized trapping levels in organic semiconductors

Sedghi, Naser; Donaghy, D.; Raja, M.; Badriya, Samer; Higgins, Simon J.; Eccleston, W.

doi:10.1016/j.jnoncrysol.2005.10.049

Cited by 11 publications

(11 citation statements)

References 7 publications

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“…Replacing the DOS function g(ε) by the product [61] in the equations of Section 5, and using Eqs. (51), (52), one comes to the result…”

Section: Transition From Dispersive To Non-dispersive Transport: Calcmentioning

confidence: 99%

“…They performed calculations in spirit of those by Grünewald and Thomas (), concluding that they ‘do not expect the results to be qualitatively different for a different choice of

g false(ϵ false)

, as long as

g false(ϵ false)

increases strongly with

ϵ

’. Since then, numerous researchers used the exponential DOS for ODSs . Furthermore, some researchers claim that the exponential DOS is an accurate approximation of the Gaussian DOS in the energy range in which transistors operate .…”

Section: Introductionmentioning

confidence: 99%

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Theoretical description of charge transport in disordered organic semiconductors

Baranovskiǐ

2014

Physica Status Solidi (b)

303

365

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Twenty years ago Heinz Bässler published in this journal the seminal review article on charge transport in disordered organic semiconductors [Phys. Status Solidi B 175, 15 (1993)], which has become one of the most popular references in this research field. Thanks to this paper, our understanding of charge transport in disordered organic materials has been essentially improved in the past two decades. New theoretical methods have been developed and new results on various phenomena related to charge transport in disordered organic materials have been obtained. The aim of the current review is to present these new theoretical methods and to highlight the most essential results obtained in their framework. While theoretical consideration in the article by Bässler was based on computer simulations, particular attention in the current review is given to the development of analytical theories. Dependences of charge carrier mobility and diffusivity on temperature, electric field, carrier concentration and on material and sample parameters are discussed in detail. Schematic behaviour of charge carriers within the Gaussian density of states (DOS)

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“…Replacing the DOS function g(ε) by the product [61] in the equations of Section 5, and using Eqs. (51), (52), one comes to the result…”

Section: Transition From Dispersive To Non-dispersive Transport: Calcmentioning

confidence: 99%

“…They performed calculations in spirit of those by Grünewald and Thomas (), concluding that they ‘do not expect the results to be qualitatively different for a different choice of

g false(ϵ false)

, as long as

g false(ϵ false)

increases strongly with

ϵ

Section: Introductionmentioning

confidence: 99%

Theoretical description of charge transport in disordered organic semiconductors

Baranovskiǐ

2014

Physica Status Solidi (b)

303

365

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“…At the first stages of research on organic semiconductors, it has been recognized in time-of-flight studies that the DOS in such systems is close to a Gaussian one, gð"Þ / expfÀð"=Þ 2 g [7]. However in numerous later theoretical studies, a purely exponential form of the DOS, gð"Þ / expfÀð"=Þg, has been assumed [8][9][10][11][12]. In this Letter, we show how to reveal the DOS by studying the dependence of the charge carrier mobility on the concentration of carriers n. We apply our recipe to experimental data obtained on two widely studied polymers, PPV and P3HT [13,14], and show that the DOS in these organic materials is not purely exponential, but is instead close to a Gaussian one.…”

mentioning

confidence: 99%

How to Find Out the Density of States in Disordered Organic Semiconductors

2012

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We suggest a recipe on how to determine the density of states (DOS) in disordered organic semiconductors from the measured dependence of the charge carrier mobility on the concentration of carriers n. The recipe is based on a theory for the concentration-dependent mobility. As an example, we apply our theoretical results to experimental data obtained on two polymers and show that from the class of trial DOS functions g(ε)∝exp{-(ε/σ)(p)}, only those with p>1.8 can explain the experimental results. In particular, we claim that the concentration-independent mobility at low n evidences that the DOS cannot be purely exponential, which is in contrast to numerous recent assumptions in the literature.

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“…There is some confusion in the literature with respect to the term 'transport energy'. Mixing up the effective TE ε * G in equation (51) with the real TE ε t is probably the main reason for that confusion. While the effective TE ε * G serves as a formal tool to describe the VRH as simple activation, the real TE ε t characterizes the transport level at which carriers actually conduct.…”

Section: Wot: the Concept Of The Transport Energy (Te)mentioning

confidence: 99%

Theoretical tools for the description of charge transport in disordered organic semiconductors

Nenashev

Oelerich

Baranovskiǐ

2015

J. Phys.: Condens. Matter

108

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Hopping conduction is widely considered the dominant charge transport mechanism in disordered organic semiconductors. Although theories of hopping transport have been developed in detail for applications to inorganic amorphous materials, these theories are often out of scope for the community working with organic amorphous systems. Theoretical research on charge transport in organic systems is overwhelmed by phenomenological fittings of numerical results by equations, which often make little physical sense. The aim of the current review is to bring analytical theoretical methods to the attention of the community working with disordered organic semiconductors.

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Experimental observation of the density of localized trapping levels in organic semiconductors

Cited by 11 publications

References 7 publications

Theoretical description of charge transport in disordered organic semiconductors

Theoretical description of charge transport in disordered organic semiconductors

How to Find Out the Density of States in Disordered Organic Semiconductors

Theoretical tools for the description of charge transport in disordered organic semiconductors

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