TY  - JOUR
A1  - Albrecht, Fred
A1  - Brehmer, Ludwig
A1  - Liemant, Alfred
T1  - Hopping transport in a disordered lattice simulation of dark discharge
N2  - On the basis of a stochastic model of hopping transport in disordered solids we present results of simulations of the dark discharge of surface charged thin films considering the energetic distribution of the localised states within the sheet. A non- linear differential equation with suitable boundary and initial conditions describes the time evolution of the space charge. We suppose a Gaussian distribution of energies for the carrier transporting states with a standard deviation s. The arrival time of carriers at the rear electrode of the sandwich sample is studied in dependence on film thickness, initial surface charge, and energetic disorder. Our calculations confirm that the transit time increases indirect proportional with initial surface charge and proportional with the square thickness. For standard deviations of energetic distribution of 0.05 eV up to 0.25 eV the normalised transit time grows as s1.44. We discuss this in terms of the stochastic transport model.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Angelova, Angelina
A1  - Ionov, Radoslav
A1  - Reiche, Jürgen
A1  - Brehmer, Ludwig
T1  - Head-to tail or head-to-head structure of Langmuir-Blodgett long chain ester multilayers?
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Angelova, Angelina
A1  - Penacorada, Florencio
A1  - Stiller, Burkhard
A1  - Zetzsche, Thomas
A1  - Ionov, Radoslav
A1  - Kamusewitz, Helmut
A1  - Brehmer, Ludwig
T1  - Wettability, surface morphology and stability of long chain ester multilayers obtained by different Langmuir- Blodgett deposition type
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Angelova, Angelina
A1  - Reiche, Jürgen
A1  - Ionov, Radoslav
A1  - Janietz, Dietmar
A1  - Lemmetyinen, Helge
A1  - Brehmer, Ludwig
T1  - Control of the structure of Langmuir-Blodgett films of a discotic liquid crystalline compound via the subphase composition and the adjacent molecular environment
N2  - Changes of the molecular arrangenemt that can be induced by means of the LB technique in the multilayers of a disc-shaped multialkynyl amphiphile are monitored by means of small angle X-ray diffraction. Studies of the monolayers at the air-water interface reveal "edge-on" orientation of the discs. Specific effects of the counter- ions (Na+, Cd²+, Pb²+, and Ba²+) and sub-solution pH on the monolayer collapse pressure, transfer efficiency and molecular order in the multilayers are found. A correlation between the monolayer properties and the ability for formation of periodic discotic structures in the presence of divalent counterions is established. The discotic molecules retain their "edge-on" arrangement in the highly compressed transferred films with slight irregular interdigtation of the flexible wings and inclination to the substrate normal. The tilt and the inter- digitation are reduced when the discotic monolayers are deposited in alternating LB films with barium arachidate spacer layers.
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Bochenkov, V.
A1  - Karageorgiev, Peter
A1  - Brehmer, Ludwig
A1  - Sergeev, G. B.
T1  - Quenched growth of nanostructured lead thin films on insulating substrates
N2  - Lead island films were obtained via vacuum vapor deposition on glass and ceramic substrates at 80 K. Electrical conductance was measured during vapor condensation and further annealing of the film up to room temperature. The resistance behavior during film formation and atomic force microscopy of annealed films were used as information sources about their structure. A model for the quenched growth, based on ballistic aggregation theory, was proposed. The nanostructure, responsible for chemiresistive properties of thin lead films and the mechanism of sensor response are discussed. (C) 2003 Elsevier B.V. All rights reserved
Y1  - 2004
SN  - 0040-6090
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
T1  - Supramolecular architectures for micro-sensorics and molecular electronics
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
T1  - Ultrathin films for senorics and molecular electronics
Y1  - 1999
SN  - 3-540-65487-9
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
A1  - Grasnick, G.
A1  - Herkner, G.
A1  - Kaminorz, Yvette
T1  - Organic thin film pyrosensors
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
A1  - Kaminorz, Yvette
A1  - Grasnick, G.
A1  - Herkner, G.
T1  - Organic thin film pyrosensors
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
A1  - Liemant, Alfred
A1  - Müller, I.
A1  - Albrecht, Fred
T1  - Stochastic model for charge carrier transport in disordered solids
Y1  - 1995
ER  -