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Wei Chen

Cette personne a quitté l’EPFL

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Publications associées (21)

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Efficient Base-Metal NiMn/TiO2 Catalyst for CO2 Methanation

Wei Chen, Andreas Züttel, Emanuele Moioli

Energy storage solutions are a vital component of the global transition toward renewable energy sources. The power-to-gas (PtG) concept, which stores surplus renewable energy in the form of methane, has therefore become increasingly relevant in recent year ...

2019

Over-the-Air Computation via Reconfigurable Intelligent Surface

Wei Chen, Yuning Jiang

Over-the-air computation (AirComp) is a disruptive technique for fast wireless data aggregation in Internet of Things (IoT) networks via exploiting the waveform superposition property of multiple-access channels. However, the performance of AirComp is bott ...

2021

Federated Reinforcement Learning for Electric Vehicles Charging Control on Distribution Networks

Wei Chen, Xin Liu, Yuning Jiang

With the growing popularity of electric vehicles (EVs), maintaining power grid stability has become a significant challenge. To address this issue, EV charging control strategies have been developed to manage the switch between vehicle-to-grid (V2G) and gr ...

Ieee-Inst Electrical Electronics Engineers Inc2024

Vertex function compliant with the Ward identity for quasiparticle self-consistent calculations beyond GW

Alfredo Pasquarello, Wei Chen

We extend the quasiparticle self-consistent approach beyond the GW approximation by using a range separated vertex function. The developed approach yields band gaps, dielectric constants, and band positions with an accuracy similar to highest-level electro ...

2021

Electronic Structure of Water from Koopmans-Compliant Functionals

Alfredo Pasquarello, Wei Chen, Nicola Marzari, Ngoc Linh Nguyen, Nicola Colonna, James Moraes de Almeida

Obtaining a precise theoretical description of the spectral properties of liquid water poses challenges for both molecular dynamics (MD) and electronic structure methods. The lower computational cost of the Koopmans-compliant functionals with respect to Gr ...

2021

Correspondence of defect energy levels in hybrid density functional theory and many-body perturbation theory

Alfredo Pasquarello, Wei Chen

We demonstrate the correspondence between charge transition levels of localized point defects in hybrid density functional theory and in G(0)W(0) many-body perturbation theory. To achieve this correspondence, it is necessary to properly combine the treatme ...

2013

Nonempirical hybrid functionals for band gaps of inorganic metal-halide perovskites

Alfredo Pasquarello, Wei Chen, Julia Anna Wiktor, Thomas Bischoff

Nonempirical hybrid functionals are investigated for band-gap predictions of inorganic metal-halide perovskites belonging to the class CsBX3, with B = Ge, Sn, Pb and X = Cl, Br, I. We consider both global and range-separated hybrid functionals and determin ...

2019

First-principles determination of defect energy levels through hybrid density functionals and GW

Alfredo Pasquarello, Wei Chen

In this topical review, we discuss recent progress in electronic-structure methods for calculating defect energy levels in semiconductors and insulators. We concentrate mainly on two advanced electronic-structure schemes, namely hybrid density functional t ...

Institute of Physics2015

Band offsets of lattice-matched semiconductor heterojunctions through hybrid functionals and G(0)W(0)

Alfredo Pasquarello, Wei Chen

To assess the accuracy of hybrid functional and many-body GW methods, we study the band offsets for a set of lattice-matched semiconductor heterojunctions, including AlAs/GaAs(100), AlP/GaP(100), Si/GaP(110), Ge/GaAs(110), Ge/AlAs(110), Ge/ZnSe(110), and Z ...

2014

Diffusion engineering of ions and charge carriers for stable efficient perovskite solar cells

Michael Graetzel, Wei Chen

Long-term stability is crucial for the future application of perovskite solar cells, a promising low-cost photovoltaic technology that has rapidly advanced in the recent years. Here, we designed a nanostructured carbon layer to suppress the diffusion of io ...

Nature Publishing Group2017

Accuracy of GW for calculating defect energy levels in solids

Alfredo Pasquarello, Wei Chen

The accuracy of GW in the determination of defect energy levels is assessed through calculations on a set of well-characterized point defects in semiconductors: the As antisite in GaAs, the substitutional Mg in GaN, the interstitial C in Si, the Si danglin ...

2017

Efficient and stable large-area perovskite solar cells with inorganic charge extraction layers

Michael Graetzel, Wei Chen

The recent dramatic rise in power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) has triggered intense research worldwide. However, high PCE values have often been reached with poor stability at an illuminated area of typically less than 0 ...

American Association for the Advancement of Science2015

Nonempirical hybrid functionals for band gaps and polaronic distortions in solids

Alfredo Pasquarello, Wei Chen, Giacomo Francesco Leonardo Miceli, Igor Reshetnyak

2018

Accurate band gaps of extended systems via efficient vertex corrections in GW

Alfredo Pasquarello, Wei Chen

We propose the use of an approximate bootstrap exchange-correlation kernel to account for vertex corrections in self-consistent GW calculations. We show that the approximate kernel gives accurate band gaps for a variety of extended systems, including simpl ...

2015

Mitigating modulation instability in Brillouin distributed fibre sensors

Luc Thévenaz, Mohammad Mehdi Alem Karladani, Marcelo Alfonso Soto Hernandez, Wei Chen

A thorough study of the generation of modulation instability (MI) in distributed Brillouin fibre sensors is presented. ASE noise co-propagating with the pump pulses within the MI gain spectrum has been identified to be an important factor seeding modulatio ...

Spie-Int Soc Optical Engineering2013

Comment on "Fundamental Resolution of Difficulties in the Theory of Charged Point Defects in Semiconductors"

Alfredo Pasquarello, Wei Chen

2018

Ab initio Electronic Structure of Liquid Water

Alfredo Pasquarello, Wei Chen, Giacomo Francesco Leonardo Miceli, Francesco Ambrosio

Self-consistent GW calculations with efficient vertex corrections are employed to determine the electronic structure of liquid water. Nuclear quantum effects are taken into account through ab initio path-integral molecular dynamics simulations. We reveal a ...

American Physical Society2016

Band-edge levels in semiconductors and insulators: Hybrid density functional theory versus many-body perturbation theory

Alfredo Pasquarello, Wei Chen

We compare band-edge levels as obtained with hybrid functionals and GW perturbation theory for a wide class of materials. For sp-bonded semiconductors, a close agreement is demonstrated. However, deviations for other materials are more significant and rang ...

2012

Band-edge positions in GW: Effects of starting point and self-consistency

Alfredo Pasquarello, Wei Chen

We study the effect of starting point and self-consistency within GW on the band-edge positions of semiconductors and insulators. Compared to calculations based on a semilocal starting point, the use of a hybrid-functional starting point shows a larger qua ...

2014

Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition)

Françoise Gisou van der Goot Grunberg, Li Jin, Andreas Kern, Maurizio Molinari, Jun Ren, Wei Chen, Jian Zhang, Yi Sun, Ke Liu, Yang Sun, Wei Liu, Peng Wang, Fan Zhang, Jian Wang, Li Zhang, Giuseppe Russo, Hong Zhang, Liang Xu, Jun Li, Jian Yang, Chong Liu, Ke Li

Taylor & Francis Inc2016