Luciano Mule’Stagno

University of Malta


Prof. Luciano Mule’Stagno is the Director of the Institute for Sustainable Energy and Group Leader of the Solar Research Lab at the University of Malta. He holds a Ph.D in Physics from the Missouri University of Science and Technology. He returned to his native Malta in 2007 from the US where, after his PhD studies, he spent 12 years working with MEMC Electronic Materials (now Global Wafers, formerly SunEdison). His last post there was that of Director of Worldwide Labs with responsibility for labs in Asia, Europe and the US. His major expertise is in the characterization, engineering and synthesis of semiconductor and solar materials. He has published extensively and holds 10 patents on semiconductor/solar materials. His current research interests are in photovoltaics systems and materials and other renewable energy technologies that could be applicable to Malta. He leads a 4.2M Euro project to fund the solar research lab and Solaqua a project to study offshore solar energy and several other research projects. Luciano has a passion for heritage and environmental issues. His first post in Malta was that of CEO of Heritage Malta (2007-2009) and he is currently Vice-president of Din L-Art Helwa (The National Trust of Malta). He is also Chairman of the COST (European Cooperation in Science and Technology) scientific committee, President of UMASA (The University of Malta Academic Staff Association) and has served on the boards of several local companies.


Silicon defects and possible impact on solar cell efficiency
It is well known that single-crystal silicon grown by the Czochralski method contains a certain level of interstitial oxygen and a low level of other impurities. Crystals also contain a small excess of interstitial Silicon atoms or vacancies (missing atoms) which as the crystal cools agglomerate to form extended defects. There is also an interaction between the vacancies and interstitial oxygen which results in another class of growth in defects. The density of these defects was found to impact electronic devices’ yield decades ago but until recently there was little understanding of how or if they impact solar cell yield. As efficiencies are pushed higher, evidence is starting to emerge that these defects can in fact have an impact on cell efficiency under certain circumstances. This presentation will explain these defects and examine how they could impact solar cell efficiency.

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