Johannes Kepler University of Linz

About: Johannes Kepler University of Linz is a education organization based out in Linz, Oberösterreich, Austria. It is known for research contribution in the topics: Computer science & Thin film. The organization has 6605 authors who have published 19243 publications receiving 385667 citations.

Gas dynamics and film profiles in pulsed-laser deposition of materials.

Abstract: Film-thickness profiles obtained in pulsed-laser deposition are calculated by using the well-known solution of the gas-dynamic equations which describes the expansion of the plasma plume in vacuum. The time for plasma formation is supposed to be short compared with the time of expansion. The film profile depends on the initial dimensions of the plume and on the adiabatic exponent of the vapor.

Hybrid Solar Cells Based on Nanoparticles of CuInS2 in Organic Matrices

Abstract: We report on solution-processed hybrid solar cells consisting of a nanocrystalline inorganic semiconductor, CuInS2, and organic materials. Synthesis of quantized CuInS2 nanoparticles was performed using a colloidal route, where the particle surface was shielded by an organic surfactant. First attempts were made to use nanocrystalline CuInS2 with fullerene derivatives to form flat-interface donor–acceptor heterojunction solar cells. We investigated also bulk heterojunctions by replacing the CuInS2 single layer by a blend of CuInS2 and p-type polymer (PEDOT:PSS; poly(3,4-ethylenedioxythiophene:poly(styrene sulfonic acid) in the same cell configuration. Bulk heterojunction solar cells show better photovoltaic response with external quantum efficiencies up to 20 %.

Survey on the shadow economy and undeclared earnings in oecd countries

Abstract: In most OECD countries THE policy instrument of choice to prevent people from working in the shadows has been deterrence. While deterrence is well-founded from a theoretical point of view, the empirical evidence on its success is weak: tax policies and state deregulation appear to work much better. The discussion of the recent literature underlines that in addition economic opportunities, the overall situation in the labor market, and unemployment are crucial for an understanding of the dynamics of the shadow economy. JEL-Classification: K42, H26, D78.

Charge carrier mobility in regioregular poly(3-hexylthiophene) probed by transient conductivity techniques: A comparative study

Abstract: The temperature and electric-field dependence of charge carrier mobility has been studied by a conventional time-of-flight technique in chemically purified, low dark conductivity samples of regioregular poly(3-hexylthiophene) Subsequently, the mobility of doping-induced charge carriers has been determined using the technique of charge carrier extraction by linearly increasing voltage in the same samples exposed to air The charge carrier mobility determined by both experimental techniques correspond well to each other at temperatures above $130\phantom{\rule{03em}{0ex}}\mathrm{K}$, indicating that these experimental techniques are mutually consistent The study clearly shows that the typical $\mathrm{log}\phantom{\rule{02em}{0ex}}\ensuremath{\mu}\ensuremath{\propto}\ensuremath{\beta}{E}^{1∕2}$, $\ensuremath{\beta}g0$ Poole--Frenkel-like electric-field dependence of the charge carrier mobility diminishes at temperatures around $250--270\phantom{\rule{03em}{0ex}}\mathrm{K}$, and $\ensuremath{\beta}$ becomes negative at higher temperatures Such negative electric-field dependence of mobility observed by both experimental techniques is attributed to positional disorder in a random-organic dielectric and analyzed in the framework of the disorder formalism Finally, the overall agreement indicates that the mode of charge generation has negligible effect on the temperature- and electric-field dependence of mobility except at the lowest temperatures $(l110\phantom{\rule{03em}{0ex}}\mathrm{K})$, where transit time dispersion of the photogenerated charge carriers probed by the ToF technique is more pronounced