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Abstract
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Different quantum dot (QD)-based supramolecules subsuming crab-shape poly(3-hexylthiophene) (P3HT) short chain/graphene quantum dot (GQD) and half crab-shape P3HT short chain/carbon quantum dot (CQD), patterned P3HT/GQD and
P3HT/CQD long chain, fbrillar P3HT/GQD, and fbrillar P3HT/CQD nanostructures were fabricated to stabilize P3HT:[6,6]-
phenyl C71 butyric acid methyl ester (PC71BM) solar cells during air aging. The P3HT crystals were composed of face-on
((100) and (002) prisms) and edge-on ((020) and (002) growth planes) oriented chains with distinct qualities of crystallinity.
Within 1.5 months of aging in 36% humidity at 34°C, P3HT:PC71BM photovoltaics and some of their modifed states were
no longer applicable and went down to 0% efcacy. Only the photoactive layers modifed by the fbrillar P3HT/CQD (1.74%
and 790 Ω cm2), crab-shape P3HT/GQD (0.45% and 896 Ω cm2), patterned P3HT/GQD (0.29% and 918 Ω cm2) and fbrillar
P3HT/GQD (3.39% and 670 Ω cm2) supramolecules refected non-zero performances. The decreasing slopes of photovoltaic characteristics versus the aging time were the slowest for the fbrillar P3HT/GQD-based solar cells, and performances
of 6.50% (14.05 mA cm−2, 66.11%, and 0.70 V), 5.70% (13.34 mA cm−2, 62.79%, and 0.68 V), 4.53% (12.51 mA cm−2,
56.60%, and 0.64 V) and 3.39% (11.67 mA cm−2, 51.83%, and 0.56 V) were recorded during 0, 30, 60 and 90 days of air
aging, respectively. Single crystallinity of P3HT fbrils, on one hand, and fat structure of GQDs, on the other hand, were
the origins of this phenomenon. More stabilized photovoltaics depicted longer half-life with respect to less stabilized ones,
e.g., 93 versus 19 days for P3HT:PC71BM:fbrillar P3HT/GQD and P3HT:PC71BM systems, respectively
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