Journal ArticleDOI
On the description of hopping-energy relaxation and transport in disordered systems
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In this paper, it is shown that both diffusion approximation and averaging of hopping rates are inapplicable to hopping relaxation and transport of carriers in band tails, and that both approaches lead to results different from those based on Mott's semiquantitative technique with averaging hopping distances, not the rates.Abstract:
Some recent theoretical approaches to the hopping of electrons through localized band-tail states are discussed. Particular attention is given to the approximation in which energy relaxation of non-equilibrium electrons is treated as diffusion in energy space and to the approximation based on the averaging of hopping rates. It is shown that both approaches lead to results different from those based on Mott's semiquantitative technique with averaging hopping distances, not the rates. Detailed analysis shows that both diffusion approximation and averaging of hopping rates are inapplicable to hopping relaxation and transport of carriers in band tails.read more
Citations
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Charge Transport in Disordered Organic Materials and Its Relevance to Thin‐Film Devices: A Tutorial Review
TL;DR: In this article, a tutorial review aims to provide sufficient intuitive background to draw more researchers to look into the fundamental aspects of device physics and engineering, which can be used in a wide range of applications such as display, radio-frequency tags, and solar cells.
Journal ArticleDOI
On the conduction mechanism in ionic glasses
S. D. Baranovskii,H. Cordes +1 more
TL;DR: Bunde et al. as discussed by the authors showed that the percolation theory leads to the consistent description of most puzzling conduction effects for both direct current (dc) and alternating current (ac) conductivity.
Journal ArticleDOI
Chemical diffusion coefficient of electrons in nanostructured semiconductor electrodes and dye-sensitized solar cells
TL;DR: In this paper, the properties and physical interpretation of the electron diffusion coefficient, Dn, observed in nanostructured semiconductors and dye-sensitized solar cells by small perturbation electrical and electrooptical techniques are investigated.
Journal ArticleDOI
Hopping transport in doped organic semiconductors: A theoretical approach and its application to p-doped zinc-phthalocyanine
TL;DR: In this paper, a detailed approach to the complex hopping transport in organic semiconductors is presented and used to describe experimental data from Maennig et al. on the effect of doping on conductivity, mobility and thermopower.
Journal ArticleDOI
Gaussian disorder model for high carrier densities: Theoretical aspects and application to experiments
TL;DR: In this paper, a vivid hopping model which takes the Fermi distribution into account is presented to describe the equilibrium transport in organic semiconductors also for higher carrier densities.
References
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Journal ArticleDOI
Conduction in glasses containing transition metal ions
TL;DR: In this article, a discussion of conduction in glasses containing transition metal ions is presented, and the Miller-Abrahams term and polaron hopping term tend to zero, giving a decreasing slope of the ln p versus 1/T curve.
Electronic properties of doped semiconductors
Boris I Shklovskii,A. L. Efros +1 more
TL;DR: In the last fifteen years, there has been a noticeable shift towards impure semiconductors -a shift which came about because it is precisely the impurities that are essential to a number of major semiconductor devices.
Journal ArticleDOI
Hopping in exponential band tails
TL;DR: A simple description is presented which includes both of these processes in a single, self-consistent model, and estimate the segregation time of photoexcited carriershoping and thermal excitation.
Journal ArticleDOI
Femtosecond energy relaxation in π-conjugated polymers
R. Kersting,R. Kersting,Uli Lemmer,Uli Lemmer,Rainer F. Mahrt,Rainer F. Mahrt,Karl Leo,Karl Leo,Heinrich Kurz,Heinrich Kurz,Heinz Bässler,Heinz Bässler,Ernst O. Göbel,Ernst O. Göbel +13 more
TL;DR: Ultrafast relaxation processes in poly(p-phenylenevinylene) and its oligomers are investigated using femtosecond luminescence spectroscopy and a quasi-instantaneous luminecence rise and the absence of luminescent near the excitation energy indicate very rapid vibronic relaxation.
Journal ArticleDOI
A hopping model for activated charge transport in amorphous silicon
M. Grünewald,P. Thomas +1 more
TL;DR: In this article, a variable-range hopping model is examined for transport in a band tail and the difference of the activation energies of conductivity and thermoelectric power, ΔE, is essentially determined by the steepness of the tail.