Prof. Dr. Ahmed Ennaoui is Physician and material scientist, President of the Scientific Council of IRESEN – The Moroccan Solar Energy Research Institute. He was a member of Qatar Foundation (2015-2017) as Professor at Hamad Bin Khalifa University (HBKU) and Research Director of Solar Energy group at Qatar Environmental and Energy Research Institute (QEERI), teaching at HBKU, conducting research, managing research groups, and recruiting top talents at QEERI. Prior to working at QF, he was working as a senior scientist at the Hahn Meitner Institute-Berlin (HMI) exploring new earth-abundant and non-toxic materials for solar energy conversion. He was then promoted group leader at “Helmholtz Zentrum Berlin für Materialien und Energie (HZB)”, Germany. He was visiting a professor at Osaka University (Japan). He taught several graduate courses and seminars on Advanced Thin Film materials for PV application. At HZB and QERRI, he was managing research teams, recruiting top scientists and developing novel technology allowing Drop-on-Demand (D-O-D) patterning of materials with negligible materials waste and small environmental footprint such as inkjet printing technology. He managed in his group at HMI and HZB for almost 25 years several EU’s Framework programs and projects financed by the German Federal Ministry of Education. He conducted successful feasibility studies financed by the industry (Siemens/Shell-Solar/Avancis, Solibro, Bosch, Atotech). Ennaoui has deep expertise and experience in non-vacuum processing of materials for solar energy conversion, his published work on Kesterite Cu2ZnSn(SxSe1-x)4 (CZTSSe) and Cadmium free chalcopyrite Cu(In,Ga)(SxSe1-x)2 (CIGSSe) solar cells has being recognized with h-index 39. He is author and co-author of more than 200 peer-reviewed journal articles including numerous conference contributions, He published 4 special issues and granted several patents. He is a permanent member of the Editorial Board of Solar Energy Materials and Solar Cells, member of International Solar Energy Society (ISES), member of IEEE and chair of the scientific-technical committee for the International Renewable and Sustainable Energy Conference (IRSEC).
Title and Abstract of the Speech:
Ink formulation and inkjet printing as Key Enabling Strategy for low-cost thin film photovoltaic: Application for processing Cu2ZnSn(SxSe1-x)4 (CZTSS) and Cu(In,Ga)(SxSe1-x)2 (CIGSS) solar cells
Chairman of the Scientific Council, Institut de Recherche en Energie Solaire et Energies Nouvelles (IRESEN), Rabat, Morocco
*Retired from Helmholtz Zentrum Berlin für Materialien und Energie, Lise-Meitner-Campus, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
We report on the drop-on-demand (D-O-D) inkjet printing for processing thin films chalcogenide materials and related solar cells. The critical requirement for the formulation of the ink that can be reliably inkjet printed, enabling scalable development of photonic devices is highlighted. Our results based on suitable printable precursor inks obtained either by the synthesis of nanoparticle (NPs) approach or by dissolving suitable metal salts in organic solvents are presented. The standard concept Absorber/Buffer/Window was applied for the fabrication of Cu2ZnSn(SxSe1-x)4 (CZTSS) and Cu(In,Ga)(SxSe1-x)2 (CIGSS) based solar cells with high efficiencies.