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The principle remaining challenge in the research area of organic photovoltaic (OPV) materials is to develop\udsolar cells that combine high efficiency, stability and reproducibility. Here, we demonstrate an experimental\udstrategy which has successfully addressed this challenge. We produced a number of samples of the highly\udefficient PTB7 polymer with various molecular weights (Mn   40–220k). OPV cells fabricated with this\udpolymer demonstrated significant improvement of the cell efficiency (by  90% relative) and lifetime (by\ud 300% relative) with the Mn increase. We attribute these effects to the lower density of recombination\udcenters (persistent radical defects revealed by EPR spectroscopy) and better photoactive layer\udmorphology in the samples with higher Mn. Relevance of the observed correlation between the OPV\udefficiency and stability is discussed

Efficient solar cells are more stable: the impact of polymer molecular weight on performance of organic photovoltaics