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Many degradation mechanisms in organic solar cells are underpinned by the ingress of water at certain points. We demonstrate the use of a photocurrent mapping technique to examine the diffusive ingress of water at the edges of a cell and at pinholes in the cathode layer. A diffusion model applied to the experimental results leads to a value of (5.0±2.7)×10 −6 cm 2 s −1 for...
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