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Cooled CCD camera at the Faculty of Electrical Engineering and Communication of Brno University of Technology
 Faculty of Electrical Engineering and Communication of Brno University of Technology uses G2-3200 scientific CCD camera to capture electroluminescent light generated by various electronics devices. The filter wheel, embedded into camera body, is used to filter various portions of spectrum.

The G2-3200 CCD camera is used with off-the-shelf Canon EOS photographic lens to capture luminescence of electronics devices.

G2-3200 camera and Canon EOS lens before placing into dark room

G2-3200 camera and Canon EOS lens before placing into dark room

The following example shows experiments performed by the research team at the Brno University of Technology. The experiment shows micro-plasmas, created in a fraction of mono-crystal solar cell. Micro-plasmas are created in the places where the silicon is contaminated.

Mono-crystal solar cell fragment (left) and its visible light image in the test bed (right)

When the voltage is applied to the solar cell fraction in the conductive direction, is starts to emit light in the near infra-red portion of spectrum. CCD camera with low-pass filter passing light with wave lengths longer than 740 nm show the electro luminescence. Applying voltage in the barrier direction shows micro-plasmas created in the places of silicon contamination.

Near IR luminescence of solar cell with applied voltage in conductive direction (left) and micro-plasmas after applying voltage in barrier direction (right)

Another example shows the so-called whirlpool defect of mono-crystal solar cells. This defect is visible if voltage is applied in conductive direction, voltage in barrier direction shows micro-plasmas like in previous example.

Whirlpool defect of solar cell (left) and micro-plasmas on the same cell (right)

 
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