Publications related to Electron emission

Towards near-atomic resolution imaging of microsecond nanoscale dynamics

Time-resolved electron microscopy has made significant progress in recent years, with some groups now working on instruments that offer attosecond temporal resolution. While much of the research in the field revolves around the improvement of temporal reso ...

EPFL2023

Thiazole Boron Difluoride Dyes with Large Stokes Shift, Solid State Emission and Room-Temperature Phosphorescence

Jieping Zhu, Wei Wang, Shuo Tong

The small Stokes shift and weak emission in the solid state are two main shortcomings associated with the boron-dipyrromethene (BODIPY) family of dyes. This study presents the design, synthesis and luminescent properties of boron difluoro complexes of 2-ar ...

WILEY-V C H VERLAG GMBH2022

High-Resolution Transmission Electron Microscopy with Bright Microsecond Electron Pulses

Marcel Drabbels, Ulrich Lorenz, Pavel Olshin, Gabriele Bongiovanni

Transmission electron microscopy at atomic-resolution is a crucial tool in a variety of fields, ranging from materials science to biology. [1,2] Fast electron cameras have recently enabled high-speed observations atomic resolution. [3] Moreover, they have ...

2021

Radiative cooling of carbon cluster anions C-2n+1(-) (n=3-5)

Eduardo Carrascosa Casado

Radiative cooling of carbon cluster anions C(2n+1)(-)C2n+1- (n = 3-5) is investigated using the cryogenic electrostatic ion storage ring DESIREE. Two different strategies are applied to infer infrared emission on slow (milliseconds to seconds) and ultraslo ...

SPRINGER2020

Characterization of a time-resolved electron microscope with a Schottky field emission gun

Marcel Drabbels, Ulrich Lorenz, Pavel Olshin

The rapid growth of the field of time-resolved and ultrafast electron microscopy has been accompanied by the active development of new instrumentation. Recently, time-resolved microscopes equipped with a field emission gun have been introduced, demonstrati ...

2020

Intense microsecond electron pulses from a Schottky emitter

Marcel Drabbels, Ulrich Lorenz, Pavel Olshin, Gabriele Bongiovanni

Thanks to their high brightness, field emitters are the electron sources of choice in most high-end electron microscopes. Under typical operating conditions, the available emission current from these emitters is largely limited by practical considerations, ...

AIP American Institute of Physics2020

Elucidation of photovoltage origin and charge transport in Cu2O heterojunctions for solar energy conversion

Michael Graetzel, Jingshan Luo, Matthew Thomas Mayer

Heterojunctions between p-type cuprous oxide (Cu2O) and suitable n-type layers stand out as some of the best performing and abundant oxide photoabsorbers currently available for the generation of hydrogen with photoelectrochemical cells or conversion of so ...

2019

Contributions to the contact resistivity in fired tunnel-oxide passivating contacts for crystalline silicon solar cells

Christophe Ballif, Franz-Josef Haug, Andrea Ingenito, Frank Meyer, Sofia Libraro

We investigate the contact resistivity of p-type passivating contacts for silicon solar cells. Our contact structures are compatible with firing, a rapid annealing process similar to the one used for sintering of the screen-printed metallisation in solar c ...

2019

Transient Current Technique characterization of bonded interfaces for monolithic silicon radiation detectors

Jacopo Bronuzzi

This thesis aims at demonstrating a novel technique for the characterization of interfaces obtained by a CMOS-compatible Surface Activated Bonding (SAB) process between silicon wafers. This enables the optimization of the two main components of monolithic ...

EPFL2018

Electron beam dynamics in an ultrafast transmission electron microscope with Wehnelt electrode

Thomas La Grange

High temporal resolution transmission electron microscopy techniques have shown significant progress in recent years. Using photoelectron pulses induced by ultrashort laser pulses on the cathode, these methods can probe ultrafast materials processes and ha ...

Elsevier Science Bv2016

III-V Nanowire Hetero-junction Tunnel FETs integrated on Si

Davide Cutaia

In the last decade the power consumption of electronic devices has increased for both static and active components. Following the Dennard's scaling rule, as long as the transistor sizes are reduced then the supply voltage (VDD) can also be scaled in order ...

EPFL2016

Design and implementation of a fs-Transmission Electron Microscope for time-resolved studies of strongly correlated systems and nanostructures

Luca Piazza

The integration of ultrafast laser systems with transmission electron microscopes led to the extension of conventional electron microscopy (PINEM) to the 4th dimension, time, and new techniques as photon-induced near-field electron microscopy became availa ...

EPFL2015

Surface emitting Terahertz Photonic Crystal Quantum Cascade Laser realized by Bragg boundary condition

Romuald Houdré, Jérôme Faist, Zhaolu Diao, Christopher Bonzon

We theoretically and experimentally investigate a band edge Photonic Crystal (PhC) Quantum Cascade Laser (QCL) operating at 3.1 THz. The surface emission is achieved by using a second-order Bragg grating at the PhC tile boundaries. Highly directional surfa ...

Ieee2012

Charge transport mechanisms in organic and microcrystalline silicon field-effect transistors

Libero Zuppiroli, Marie-Noëlle Bussac, Steven Konezny

Several organic and inorganic materials have emerged as promising candidates for the active layer of field-effect transistors (FETs) fabricated on flexible substrates. The charge transport models necessary for device optimization in these systems are at di ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2007

Characterization of electron bunches from field emitter array cathodes for use in next-generation X-Ray free electron lasers

PSI is interested in developing an X-FEL as a companion radiation source to the existing Swiss Light Source. In order to achieve radiation wavelengths as low as 1 Å, the X-FEL requires excellent electron beam quality and high beam energy. The energy requir ...

EPFL2007

Picosecond cathodoluminescence

We have developed an original time resolved cathodoluminescence (TRCL) set-up with temporal performances similar to those of conventional time resolved optical techniques, keeping the capability to get structural information through the secondary electron ...

EPFL2005