2 research outputs found
Synthesis and Properties of Dithiafulvenyl Functionalized Spiro[fluorene-9,9′-xanthene] Molecules
Two spiroannulated
molecular structures with dithiafulvenyl units
functionalized at the 2,2′,7,7′- (<b>SFX-DTF1</b>) and 2,3′,6,′7- (<b>SFX-DTF2</b>) positions
of a spiro[fluorene-9,9′-xanthene] core were synthesized. Studies
revealed the hole mobility was significantly influenced by the dithiafulvenyl
functionalized positions in the molecular structure. To explore their
primary applications as hole-transporting materials in perovskite
solar cells, <b>SFX-DTF1</b>-based devices exhibited a power
conversion efficiency of 10.67% without the use of p-type dopants,
yielding good air stability
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