Attempt
to Improve the Performance of Pyrrole-Containing Dyes in Dye Sensitized Solar Cells by Adjusting
Isolation Groups
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Abstract
Four new pyrrole-based organic sensitizers
with different isolation groups were conveniently synthesized and
applied to dye sensitized solar cells (DSCs). The introduction of
isolation group in the side chain could both suppress the formation
of dye aggregates and electron recombination. Especially, when two
pieces of D-π-A chromophore moieties shared one isolation group
to construct the “H” type dye, the performance was further
improved. Consequently, in the corresponding solar cell of <b>LI-57</b>, a short-circuit photocurrent density (<i>J</i><sub>sc</sub>) was tested to be 13.85 mA cm<sup>–2</sup>, while 0.72 V
for the open-circuit photovoltage (<i>V</i><sub>oc</sub>), 0.64 for the fill factor (FF), and 6.43% for the overall conversion
efficiency (η), exceeding its analogue <b>LI-55</b> (5.94%)
with the same isolation group. The results demonstrated that both
the size (bulk and shape) and the linkage mode between the D-π-A
chromophores and the isolation groups, could affect the performance
of sensitizers in DSCs in a large degree, providing a new approach
to optimize the chemical structure of dyes to achieve high conversion
efficiencies