A round robin, where several laboratories study the same solar cells in a sequential manner, is a fast and powerful method that enables the validation of performance parameters and the establishment of their spread. Flexible and ITO-free polymer solar cells characterized in this manner present a spread in recorded parameters with a standard error of 5–25% where degradation is eliminated. This underlines the need for the general use of such techniques.
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Larsen‐Olsen et al. (2012) studied this question.
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