1 research outputs found
Solution-Processable ZnO/Carbon Quantum Dots Electron Extraction Layer for Highly Efficient Polymer Solar Cells
In
this work, we report the effort
to develop high-efficiency inverted polymer solar cells (PSCs) by applying
a solution-processable bilayer ZnO/carbon quantum dots (C-QDs) electron
extraction layer (EEL). It is shown that the use of the bilayer EEL
helps to suppress the exciton quenching by passivating the ZnO surface
defects in the EEL, leading to an enhanced exciton dissociation, reduced
charge recombination and more efficient charge extraction probability,
and thereby achieving high power conversion efficiency (PCE). The
inverted PSCs, based on the blend of poly{4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-<i>b</i>:4,5-<i>b</i>′]dithiophene-2,6-diyl-<i>alt</i>-3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-<i>b</i>]thiophene-4,6-diyl} and [6,6]-phenyl C71-butyric acid
methyl ester, possess a significant improvement in PCE of ∼9.64%,
which is >27% higher than that of a control cell (∼7.59%).
The use of a bilayer ZnO/C-QD EEL offers a promising approach for
attaining high-efficiency inverted PSCs