期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 23, 页码 12469-12477出版社
AMER CHEMICAL SOC
DOI: 10.1021/am403668d
关键词
pyrrole; isolation group; H type dyes; organic sensitizer; dye-sensitized solar cell
资金
- National Science Foundation of China [21002075, 21372003]
- National Fundamental Key Research Program [2011CB932702]
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-pi-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 LI-57, a short-circuit photocurrent density (J(sc)) was tested to be 13.85 mA cm(-2), while 0.72 V for the open-circuit photovoltage (V-oc), 0.64 for the fill factor (FF), and 6.43% for the overall conversion efficiency (eta), exceeding its analogue LI-55 (5.94%) with the same isolation group. The results demonstrated that both the size (bulk and shape) and the linkage mode between the D-pi-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.
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