Microscopic optoelectronic defectoscopy of solar cells
Brno University of Technology, Faculty of Electrical
Engineering and Communication, Physics Department, Technická 8, 616 00
Scanning probe microscopes are powerful tool for micro- or nanoscale diagnostics of defects in crystalline silicon solar cells. Solar cell is a large p-n junction semiconductor device. Its quality is strongly damaged by the presence of defects. If the cell works under low reverse-biased voltage, defects emit a light in visible range. The suggested method combines three different measurements: electric noise measurement, local topography and near-field optical beam induced current and thus provides more complex information. To prove its feasibility, we have selected one defect (truncated pyramid) in the sample, which emitted light under low reverse-biased voltage.
© Owned by the authors, published by EDP Sciences, 2013