scholarly journals Hopping charge transport in amorphous semiconductors with the spatially correlated exponential density of states

2017 ◽  
Vol 146 (2) ◽  
pp. 024504 ◽  
Author(s):  
S. V. Novikov
Keyword(s):  
Charge Transport ◽  
Density Of States ◽  
Amorphous Semiconductors ◽  
Spatially Correlated ◽  
Exponential Density

The Study of Charge Transport in Nanoscale DNA Structures

2010 ◽  
Vol 1280 ◽  
Author(s):  
G. Bart ◽  
M. R. Singh ◽  
M. Zinke-Allamang
Keyword(s):  
Electrical Conductivity ◽  
Density Of States ◽  
Variable Range Hopping ◽  
Band Tail ◽  
Phonon Interaction ◽  
Dna Structures ◽  
Electron Phonon Interaction ◽  
Electric Field Dependence ◽  
Exponential Density ◽  
Base Distance

AbstractWe have studied the variable range hopping (VRH) mechanism for polarons in DNA structures using an exponential density of states. Due to the electron-phonon interaction localized polarons are formed in the DNA helix. The unwinding of DNA increases molecular orbital overlap between bases while decreasing the base-to-base distance. These types of vibrations create phonons. We consider that DNA has a band tail which has an exponential density of states and we have calculated the temperature- and the electric field dependence of the conductivity. We compare our model with the experiments of the electrical conductivity of samples of double-stranded H5N1 genes of avian Influenza virus DNA. Our theory is able to explain their data.

scholarly journals Impact of Hydrogen Bonds Limited Dipolar Disorder in High-k Polymer Gate Dielectric on Charge Carrier Transport in OFET

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 826
Author(s):  
Bartosz Paruzel ◽  
Jiří Pfleger ◽  
Jiří Brus ◽  
Miroslav Menšík ◽  
Francesco Piana ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Charge Carrier ◽  
Charge Transport ◽  
Density Of States ◽  
Dielectric Layer ◽  
Carrier Transport ◽  
Gate Dielectric ◽  
Field Effect Transistors ◽  
Semiconductor Layer ◽  
High K

The paper contributes to the characterization and understanding the mutual interactions of the polar polymer gate dielectric and organic semiconductor in organic field effect transistors (OFETs). It has been shown on the example of cyanoethylated polyvinylalcohol (CEPVA), the high-k dielectric containing strong polar side groups, that the conditions during dielectric layer solidification can significantly affect the charge transport in the semiconductor layer. In contrast to the previous literature we attributed the reduced mobility to the broader distribution of the semiconductor density of states (DOS) due to a significant dipolar disorder in the dielectric layer. The combination of infrared (IR), solid-state nuclear magnetic resonance (NMR) and broadband dielectric (BDS) spectroscopy confirmed the presence of a rigid hydrogen bonds network in the CEPVA polymer. The formation of such network limits the dipolar disorder in the dielectric layer and leads to a significantly narrowed distribution of the density of states (DOS) and, hence, to the higher charge carrier mobility in the OFET active channel made of 6,13-bis(triisopropylsilylethynyl)pentacene. The low temperature drying process of CEPVA dielectric results in the decreased energy disorder of transport states in the adjacent semiconductor layer, which is then similar as in OFETs equipped with the much less polar poly(4-vinylphenol) (PVP). Breaking hydrogen bonds at temperatures around 50 °C results in the gradual disintegration of the stabilizing network and deterioration of the charge transport due to a broader distribution of DOS.

Erratum: “Hopping photoconductivity in an exponential density of states” [Appl. Phys. Lett. 101, 103307 (2012)]

2013 ◽  
Vol 102 (16) ◽  
pp. 169901
Author(s):  
A. Iacchetti ◽  
D. Natali ◽  
M. Binda ◽  
L. Beverina ◽  
M. Sampietro
Keyword(s):  
Density Of States ◽  
Exponential Density

Urbach energy and the tails of the density of states in amorphous semiconductors

2011 ◽  
Vol 78 (2) ◽  
pp. 223-227 ◽  
Author(s):  
S. Zaynobidinov ◽  
R. G. Ikramov ◽  
R. M. Jalalov
Keyword(s):  
Density Of States ◽  
Urbach Energy ◽  
Amorphous Semiconductors

Semiclassical density-of-states and optical-absorption analysis of amorphous semiconductors

1995 ◽  
Vol 51 (7) ◽  
pp. 4143-4149 ◽  
Author(s):  
Stephen K. O’Leary ◽  
Stefan Zukotynski ◽  
John M. Perz
Keyword(s):  
Optical Absorption ◽  
Density Of States ◽  
Amorphous Semiconductors ◽  
Absorption Analysis
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