City University of Hong Kong

Professor of Photovoltaics, TU Berlin and Helmholtz-Zentrum Berlin

Department of Physics and Astrophysics, University of Delhi

Professor, Chair of Electronic Devices, University of Wuppertal

Kiel University

National Chi Nan University

Applied Materials

Director PVcomB, Helmholtz Zentrum Berlin, Professor at HTW Berlin

Associate Professor, Department of Chemical Sciences (DiSC), University of Padova

Emeritus research staff member, IBM Research Zurich,