Abstract

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 $1.5\times 0.8\mathrm{m}$ on the cell plane was flattened within $\pm 2.6\%$ through gray scale adjustment, which was originally about 200%. Scanning a small square image with an area of $3\times 3\mathrm{mm}$ over a square-shaped photovoltaic cell with an area of $15.6\times 15.6\mathrm{cm}$, 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.

©2012 Optical Society of America

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