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Here we consider two hypotheses to explain the open-circuit voltage (Voc) degradation observed in thin-film vapor-liquid-solid (TF-VLS) grown p-type InP photovoltaic cells: bandgap narrowing and local shunting. First, a bandgap (Eg) narrowing effect is hypothesized, based on the surface inhomogeneity of VLS InP captured by the photoluminescence (PL) image. The PL data was used to estimate a spatially-resolved...
In recent years a significant amount of effort has been devoted towards the development of dopant-free carrier selective contacts for crystalline silicon (c-Si) solar cells. This short manuscript surveys a range of materials which have the potential to induce carrier-selectivity when applied to c-Si, including metals, metal oxides, alkali / alkaline earth metal salts, and organic conductors. Simple...
We present a novel, general-purpose method for deconvolving and denoising images from gridded radio interferometric visibilities using Bayesian inference based on a Gaussian process model. The method automatically takes into account incomplete coverage of the uv-plane and mode coupling due to the beam. Our method uses Gibbs sampling to efficiently explore the full posterior distribution of the underlying...
To cope with the growing requirements of data intensive scientific experiments, models and simulations the Large Scale Data Facility(LSDF) at KIT aims to support many scientific disciplines. The LSDF is a distributed storage facility at Exabyte scale providing storage, archives, data bases and meta data repositories. Open interfaces and APIs support a variety of access methods to the highly available...
Grid access methods are still dominated by command line tools or manually developed, problem specific graphical user interfaces. This fact reduces the acceptance of the Grid for users, who are not familiar with the usage of the Linux shell or the Grid itself. The first step away from the command line was done by the Globus Alliance by interpreting and realizing the Grid as a Service Oriented Architecture(SOA)...
The presented dynamic grid service architecture provides a novel and comfortable access for scientific software developers and users without prior knowledge of grid technologies or even the underlying architecture. A simple Java API allows the extension of WSRF-compliant Web services by scientific software components deployed automatically on available GT4 containers. In preparation only two services...
Grid is a rapidly growing new technology that will provide easy access to vast amounts of computer resources, both hardware and software. As these resources become available soon, more and more scientific users are interested in benefiting from them. At this time the main problem accessing Grid is that scientific user usually need to know a lot about Grid methods and technologies besides their own...
This paper presents a QPSK modulator equipment designed and qualified for space applications. It enables high data rate transmission for Earth observation satellites. The equipment is based on a full MMIC RF chain, including a MMIC QPSK linear vector modulator, and features a direct X band Local oscillator (LO). Data rates up to 2?150 Mbits/s and RF output power up to 6 W for LO frequencies between...
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