Front Cover of 2016(2) Issue of <I>Science Bulletin</I> (IMAGE)
Caption
Fullerene derivatives have been widely used as electron acceptors in organic/polymer solar cells and perovskite solar cells. To investigate the stereomeric effects of fullerene on the photovoltaic performance, two stereomers of the bisadduct analogues of [6,6]-phenyl-C71-butyric acid methyl ester (bisPC71BM) were isolated and blended with poly(3-hexylthiophene) (P3HT) for fabricating polymer solar cells. Although both trans- and cis-bisPC71BM showed similar spectrometric and electronic properties, a photovoltaic discrepancy resulted from the difference in their molecular packing. Accordingly, the guidelines for designing an efficient electron acceptor should be supplemented, and the stereomeric effect should be envisaged in addition to the fullerene core, type of functional group, and number of addends and their addition positions. The cover picture shows the structures of the trans- and cis-bisPC71BM molecules as well as the polymer solar cells.
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