Plenary Talks

Silicon Photovoltaics: Status, Defect Issues and the Emerging Role of Photoluminescence Imaging

Martin A. Green
ARC Photovoltaics Centre of Excellence
University of New South Wales, Sydney
AUSTRALIA

Photovoltaics is currently booming with solar cells now starting to contribute significant power at the grid level in Europe, particularly in Germany. The mainstream product uses directionally solidified, boron-doped multicrystalline silicon wafers although large amounts of Czochralski-grown crystalline ingots are also used.

An interesting defects relevant to photovoltaics has been the B-O complex which can assume several different states and level of activity under light and thermal treatments. Decorated crystallographic defects control the properties of multicrystalline wafers. Much current interest has been in the development of upgraded metallurgical grade (UMG) silicon that avoids the expensive Siemens silicon purification steps.

Photo- and electro-luminescence imaging, a technique pioneered by the author’s group, is starting to become a standard tool for monitoring defect activity during processing. Examples of how this is being used will be discussed, including the grading of incoming wafers in terms of defect signatures.

Martin Green

Martin Green is currently a Scientia Professor at the University of New South Wales, Sydney, Australia and Executive Research Director of the University's Photovoltaic Centre of Excellence. His group's contributions to photovoltaics include development of the world’s highest efficiency silicon solar cells and commercialization of several different cell technologies.  He is the author of several books on solar cells and numerous papers.  His work has resulted in many major international awards including the 2002 Right Livelihood Award, commonly known as the Alternative Nobel Prize, the 2007 SolarWorld Einstein Award and the 2009 ENI Award for Renewable and Non Conventional Energy.

Professor Martin A. Green
Executive Research Director
m.green@unsw.edu.au