Concept

Tension de polarisation

Publications associées (120)

Beyond Scaling

Over the recent decades, the balance between increasing the complexity of computer chips and simultaneously reducing cost per bit has been accommodated by down-scaling. While extremely successful in the past, this approach now faces grave limitations leadi ...

EPFL2012

Correlating long-lived photogenerated hole populations with photocurrent densities in hematite water oxidation photoanodes

Michael Graetzel, Kevin Sivula

Photogenerated charge carrier dynamics are investigated as a function of applied bias in a variety of different hematite photoanodes for solar water oxidation. Transient absorption spectroscopy is used to probe the photogenerated holes, while transient pho ...

2012

Layout and Architecture Issues in Hall based CMOS microsystems

Pierre-André Farine, Pavel Kejik

The Hall cells intended for industrial applications are mainly produced in silicon integrated circuit technology. Recently, the increased use of other technologies, such as GaAs, InAs and InSb, have been reported. However, a single chip solution comprising ...

Czech Technical University in Prague, Faculty of Electrical Engineering2012

Nanoscale Organic / Inorganic Hybrid Photovoltaic Devices

Thomas Dufaux

There is an increasing trend of using various types of nanostructures as components of solar cells. This highlights the need to gain a deeper understanding of the nanoscale interface in such devices. The present thesis aims to study individual photoactive ...

EPFL2012

Coulomb blockade in a granular material made of gold nanowires

Hoël Maxime Guérin

Uniform, 2 nm diameter gold nanowires were synthesized through the reduction of gold(III) chloride in an oleylamine matrix. They were top-contacted on a Si/SiO2 substrate with metallic electrodes to manufacture back-gated transistors. Due to thermal breaka ...

2012

Dynamics of photogenerated holes in surface modified alpha-Fe2O3 photoanodes for solar water splitting

Michael Graetzel, Kevin Sivula, Takashi Hisatomi

This paper addresses the origin of the decrease in the external electrical bias required for water photoelectrolysis with hematite photoanodes, observed following surface treatments of such electrodes. We consider two alternative surface modifications: a c ...

National Academy of Sciences2012

On the origin of exciton formation in dye doped Alq(3) OLEDs

Libero Zuppiroli

Electrically Detected Magnetic Resonance (EDMR) was used to investigate the influence of dye doping on spin-dependent exciton formation in aluminum (III) 8-hydroxyquinoline (Alq(3)) based Organic Light Emitting Diodes (OLEDs) with different device structur ...

Springer2012

FACT - The First G-APD Cherenkov Telescope (first results)

Werner Lustermann, Mathieu Ribordy, Thomas Günther Bretz

In October 2011, the first air-Cherenkov telescope utilizing Geiger-mode avalanche photodiodes commenced operations. The silicon-based devices display several advantages compared to classical photomultiplier tubes allowing for a more compact camera design ...

Amer Inst Physics2012

Self-Pulsation at Zero Absorber Bias in GaN-Based Multisection Laser Diodes

Nicolas Grandjean, Jean-François Carlin, Julien Dorsaz, Luca Alex Milo Sulmoni

We study the influence of pump current and absorber bias voltage on the pulse width and frequency of sustained pulsation in GaN-based multisection laser diodes. The observed frequencies and pulse widths range from 1.5 to 4.5GHz and 90 to 18 ps, respectivel ...

2011

Dynamics of photogenerated holes in nanocrystalline alpha-Fe2O3 electrodes for water oxidation probed by transient absorption spectroscopy

Michael Graetzel, Kevin Sivula

Transient absorption spectroscopy on the mu s-s time scale is used to monitor the yield and decay dynamics of photogenerated holes in nanocrystalline hematite photoanodes. In the absence of a positive applied bias, these holes are observed to undergo rapid ...

2011

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