Fig. 9

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Histogram of normalized brightness of two cells; shaded (1a, 2a, 3a in red) and unshaded (1b, 2b, 3b in blue) before, after 5 h and after 10 h of the HS testing at 75 °C module temperature of the HJT − Full-cell module. The normalized brightness range is from 0 (black) to 255 (white). EL images taken at 0.1 × Isc.

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