Aïcha Hessler-Wyser

Nationality: CH

EPFL STI IMT PV-LAB
MC A2 305 (Bâtiment MC)
Rue de la Maladière 71b, CP 526
2002 Neuchâtel 2

Expertise

TEM, SEM, Photovoltaïcs, Material Science Materials for Energy, Nanophysics, Metallurgy (metals, superalloys, SMA, powders...)

Mission

PVlab's mission is to push the boundaries of photovoltaic science and foster the innovations needed to shape next-generation PV technologies. This ambition requires mastering the behaviour of PV materials across all scales — atomic, microscopic, and macroscopic. My contribution lies in the systematic microstructural characterization of PV cells and modules, directly informing strategies to enhance their efficiency and durability.

After completing my Master's and PhD in Physics at EPFL, specializing in Electron Microscopy, I joined the Centre for Electron Microscopy and Microanalysis at the University of Western Australia (UWA) in Perth in 2000. Two years later, I returned to EPFL's Centre for Electron Microscopy (CIME) as a scientific researcher under Prof. C. Hébert, leading projects across materials science — including solid oxide fuel cells, photovoltaics, and metallurgy. During this period, I supervised 6 PhD students, contributed to teaching at bachelor's, master's, and doctoral levels, and provided training and support to TEM users.
In 2012, I joined the Laboratory of Photovoltaics and Thin-Film Electronics (PVlab) as Deputy Director. Alongside laboratory head Prof. Ballif, I oversee financial and human resources management while maintaining an active research role focused on the microstructural analysis of photovoltaic materials — spanning nanometric layers in PV cells to fully encapsulated PV modules. At PVlab, I have directed 5 PhD students to completion, with 2 more currently pursuing their theses.

Education

Doctorat

| Physique

1999 – 1999 EPFL
Directed by Rolf Gotthardt

Ing�nieure EPF

| Physique

1994 – 1994 EPFL
Directed by J.-D. Ganière

Teaching & PhD

PhD Students

Marie Amélie Camille Courtant, Chiara Ongaro, Yu-Hsuan Lai

Past EPFL PhD Students

Guillaume Pasche, Federica Landucci, Jonathan Thomet, Caroline Hain, Sofia Libraro, Mostafa Othman

Past EPFL PhD Students as codirector

Antonin Faes, Jonas Vannod, Josef Andreas Schuler, Léa Deillon, Quentin Jeangros

Courses

Introduction to microscopy + Laboratory work

MSE-352

This course of introduction to microscopy aims at giving an overview of the various techniques of microstructure and composition analysis of materials. It focuses in particular on electron and optical microscopy. This course is composed of lectures and practical demonstrations on microscopes.