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The influence of the microstructure of poly(3-hexylthiophene) (P3HT) on its photodegradation upon exposure to UV–visible light was studied. High-regioregular (>98%) and low-regioregular (<95%) P3HTs with different molecular weights, dispersities and purities were submitted to irradiation under accelerated artificial ageing conditions. While the molecular weight had no effect on the photodegradation...
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