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Appl Opt. 2012 Jul 10;51(20):4563-8. doi: 10.1364/AO.51.004563.

Spatial uniformity inspection apparatus for solar cells using a projection display.

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Division of Physical Metrology, Korea Research Institute of Standards and Science, Yuseong-Gu, Daejeon, South Korea.


We demonstrate a measurement apparatus to inspect spatial uniformity of quantum efficiency of solar cells using a beam projector. Deviation of irradiance from the used beam projector over the area of 1.5×0.8 m on the cell plane was flattened within ±2.6% through gray scale adjustment, which was originally about 200%. Scanning a small square image with an area of 3×3 mm over a square-shaped photovoltaic cell with an area of 15.6×15.6 cm, we could identify the locations according to efficiency level and showed that the cell had quantum efficiency deviation of more than 10%. Utilizing the advantageous feature of a projection display, we also demonstrated that this apparatus can inspect the spatial uniformity of solar modules and panels consisting of multiple solar cells.

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