Concept

Opal

Related publications (32)

Solvent Induced Pseudopolymorphism in a Calixarene-Based Porous Host Framework

The self-assembly properties of the proximal p-tert-butylcalix[4]dihydroquinone compound have been studied to investigate the role played by crystallization conditions in driving the formation of a previously reported cubic porous framework. In chloroform ...

American Chemical Society2010

Impact of secondary gas-phase reactions on microcrystalline silicon solar cells deposited at high rate

Christophe Ballif, Grégory Bugnon, Andrea Feltrin, Thomas Söderström, Benjamin Strahm, Gaetano Parascandolo

The role of secondary gas-phase reactions during plasma-enhanced chemical vapor deposition of microcrystalline silicon is a controversial subject. In this paper, we show that the enhancement of such reactions is associated with the improvement of material ...

American Institute of Physics2010

Influence of pressure and silane depletion on microcrystalline silicon material quality and solar cell performance

Christophe Ballif, Grégory Bugnon, Julien Claude Bailat, Andrea Feltrin

Hydrogenated microcrystalline silicon growth by very high frequency plasma-enhanced chemical vapor deposition is investigated in an industrial-type parallel plate R&D KAI (TM) reactor to study the influence of pressure and silane depletion on material qual ...

2009

Silane depletion dependent ion bombardment and material quality of microcrystalline silicon deposited by VHF-PECVD

Christophe Ballif, Grégory Bugnon, Julien Claude Bailat, Andrea Feltrin

Microcrystalline silicon is a composite material embedding silicon nanocrystals in an amorphous matrix [1]. It has attracted much research efforts in the photovoltaic domain [2], because of its potential for integration in a tandem cell concept as bottom c ...

2009

Influence of ion bombardment on microcrystalline silicon material quality and solar cell performances

Christophe Ballif, Grégory Bugnon, Julien Claude Bailat, Andrea Feltrin, Fanny Sculati-Meillaud

Microcrystalline hydrogenated silicon growth with VHF-PECVD was examined in an industrial type parallel plate KAITM reactor. The influence of pressure on material quality was studied in single junction solar cells. Solar cells with their intrinsic layer pr ...

2008

Sub-cellular quantitative optical diffraction tomography with digital holographic microscopy

Christian Depeursinge, Tristan Colomb, Etienne Cuche, Pierre Marquet, Jonas Kühn, Florian Charrière

Digital holographic microscopy (DHM) is an interferometric technique, providing quantitative mapping of the phase shift induced by semi- transparent microscopic specimens, such as cells, with sub-wavelenght resolution along the optical axis. Thanks to actu ...

SPIE2007

Microcrystalline silicon deposited at high rate on large areas from pure silane with efficient gas utilization

Christophe Ballif, Christoph Hollenstein, Alan Howling, Laurent Fabien Hubert Sansonnens, Benjamin Strahm

Microcrystalline silicon thin film deposited by RF-PECVD and integrated in a tandem structure is a promising material for low cost photovoltaic solar cells compared to solar cells based on crystalline silicon. However, in order to allow a cost-effective ma ...

2007

Nanoparticules à noyau métallique recouvert de silice

Heinrich Hofmann, Alke Fink

The invention relates to nanoparticles based on a metal, on a metal alloy or on a metal derivative coated with a silica layer, in which the silica is crystalline silica, in particular crystalline silica in the cristobalite form. They may be prepared from n ...

2006

Pièce en céramique pigmentée

Heinrich Hofmann, Alke Fink

NOVELTY - The component partially or wholly comprises pigmented ceramic. The pigment comprises nanoparticles of metal of group IB in periodic table, alkaline metals or their alloy, coated with a layer of silica such as crystalline silica. The crystalline s ...

2006

Cristobalite inclusions in the Tatahouine achondrite: Implications for shock conditions

Philippe Gillet

The mineralogy of the Tatahouine diogenite was investigated by optical microscopy, Raman micro-spectrometry, and scanning and transmission electron microscopies. Inclusions of alpha-cristobalite in orthopyroxenes, locally in symplectic association with chr ...

2002

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