10.1021/am403668d.s001 Huiyang Li Huiyang Li Yingqin Hou Yingqin Hou Yizhou Yang Yizhou Yang Runli Tang Runli Tang Junnian Chen Junnian Chen Heng Wang Heng Wang Hongwei Han Hongwei Han Tianyou Peng Tianyou Peng Qianqian Li Qianqian Li Zhen Li Zhen Li Attempt to Improve the Performance of Pyrrole-Containing Dyes in Dye Sensitized Solar Cells by Adjusting Isolation Groups American Chemical Society 2013 sensitizer chromophore dye efficiency DSC FF isolation groups Dye Sensitized Solar Cells conversion isolation group LI performance 2013-12-11 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Attempt_to_Improve_the_Performance_of_Pyrrole_Containing_Dyes_in_Dye_Sensitized_Solar_Cells_by_Adjusting_Isolation_Groups/2343079 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.