BT Imaging designs and develops Luminescence Imaging Systems for the photovoltaic manufacturing industry.

BT Imaging Pty Ltd (BTi) is an Australian-based supplier of Luminescence Imaging Systems for use in research, product and process development, inline manufacturing inspection, and quality control of silicon wafers, photovoltaic cells and photovoltaic modules.

Photoluminescence (PL) imaging is the primary mechanism used by BTi to detect various faults or imperfections in bare silicon wafers and silicon solar cells at any stage of the solar cell manufacturing process. BTi combines PL with a number of other measurement techniques in order to create solutions that meet its customer's requirements.

BTi's innovative photoluminescence (PL) imaging technology enables high resolution images of the luminescent emission to be measured on silicon wafers and silicon solar cells with data acquisition times of typically less than one second. High resolution images reveal material and electrical cell parameters such as the minority carrier lifetime and the series resistance - these can be obtained quickly enough for inline monitoring of every sample. The short data acquisition times and high spatial resolution allow PL imaging tools to be used for efficient quality control, product and process improvements, and process design of silicon wafers, solar cells, and entire photovoltaic modules.