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(a) Digital image of the front and (b) back side of the large pc-Si ODT no1 showing 2 corrosion signs. (c) The UVF image clearly shows both corrosion signs and suppression of the UV fluorescence in the cell edges and the busbar. (d) Diagonal UV fluorescence pattern, (e,f) UVF images of a SW80 module showing invisible cracks. UVF images captured during PV illumination with UV light at 375 nm.
