|
Abstract
|
Pure carbon nanotubes (CNTs) and their derivatives grafted with the irregioregular poly(3-dodecyl Q4
thiophene) (CNT-g-PDDT) and regioregular poly(3-hexylthiophene) (CNT-g-P3HT) polymers were
employed to improve the morphological, optical, and photovoltaic properties of CH3NH3PbI3 perovskite
solar cells. Although the grafted CNT components improved the cell characteristics, bare CNTs
destroyed them. The regioregularity and graft length influences were investigated on the system
behavior. The CNT nanostructures grafted with the shorter P3HT backbones demonstrated the best
results, i.e., 79.9 O, 23.60 mA cm2, 76%, 0.97 V and 17.40%. This originated from the higher crystalline
peak intensities for both P3HT (5.6–5.81) and CH3NH3PbI3 (14.81, 20.91, 24.11, 29.21 and 32.511) precursors and also the larger grain sizes (5 (600 nm) versus 50 (490 nm) kDa). The perovskite + CNT-g-P3HT
devices, in particular the CNTs with shorter grafts, possessed faster electron transport and lower carrier
recombination compared with the other solar cells, as evidenced by the larger short-circuit current
density.
|