Publication
Ultrafast spectroscopy of wide bandgap semiconductor nanostructures
Related publications (155)
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Since the dawn of humanity, human beings seeked to light their surroundings for their well-being, security and development. The efficiency of ancient lighting devices, e.g. oil lamps or candles, was in the order of 0.03-0.04% and jumped to 0.4-0.6% with th ...
EPFL2024Study of growth-induced point defects and their impact on InGaN-based optoelectronic devices
GaN exhibits a decomposition tendency for temperatures far below its melting point and common growth temperatures used in metal-organic vapour phase epitaxy (MOVPE).This characteristic is known to be a major obstacle for realising GaN bulk substrate. There ...
EPFL2024Investigation of room-temperature single-photon emitters in GaN-based materials and GaN/AlN quantum dots
Over the past decade, quantum photonics platforms aiming at harnessing the fundamental properties of single particles, such as quantum superposition and quantum entanglement, have flourished. In this context, single-photon emitters capable of operating at ...
EPFL2024Persistent enhancement of exciton diffusivity in CsPbBr3 nanocrystal solids
In semiconductors, exciton or charge carrier diffusivity is typically described as an inherent material property. Here, we show that the transport of excitons among CsPbBr3 perovskite nanocrystals (NCs) depends markedly on how recently those NCs were occup ...
Amer Assoc Advancement Science2024The nanoscale impact of individual nonradiative point defects on InGaN/GaN quantum wells
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Today's world depends on optoelectronic devices: light-emitting diodes illuminate our houses and backlight the displays on our gadgets, while laser diodes underpin fibre-optic communication. Such optoelectronic devices rely on crystalline semiconductor het ...
EPFL2023Polariton lasing in AlGaN microring with GaN/AlGaN quantum wells
Nicolas Grandjean, Jean-François Carlin, Raphaël Butté
Microcavity polaritons are strongly interacting hybrid light-matter quasiparticles, which are promising for the development of novel light sources and active photonic devices. Here, we report polariton lasing in the UV spectral range in microring resonator ...
AIP Publishing2023Polaron hopping through piecewise-linear functionals
Alfredo Pasquarello, Stefano Falletta
We use piecewise-linear functionals to study the polaron energy landscape and hopping rates in beta-Ga2O3, which we adopt as an example of an anisotropic material hosting multiple polaronic states. We illustrate various functionals for polaron localization ...
AMER PHYSICAL SOC2023Optoelectronics based on the spin-valley physics of 2D materials
Two-dimensional (2D) materials are atomically thin crystals with exceptional mechanical, electrical and optical properties. Their unique characteristics originating from quantum confinement in the vertical dimension have attracted a strong interest for sci ...
EPFL2022Ultrafast carrier and quasiparticle dynamics in strongly confined perovskite nanoplatelets
Over the past decade, lead halide perovskites (LHPs) have received considerable attention thanks to their impressive optoelectronic properties. Today, LHP-based devices are one of the most efficient single-junction solar cells, with power-conversion effici ...
EPFL2022Deep defects in InGaN LEDs: modeling the impact on the electrical characteristics
Nicolas Grandjean, Jean-François Carlin, Camille Haller
Deep defects have a fundamental role in determining the electro-optical characteristics and in the efficiency of InGaN light-emitting diodes (LEDs). However, modeling their effect on the electrical characteristics of the LED is not straightforward. In this ...
SPIE-INT SOC OPTICAL ENGINEERING2022