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A peri-Xanthenoxanthene Centered Columnar-Stacking Organic Semiconductor for Efficient, Photothermally Stable Perovskite Solar Cells.

Niansheng XuYang LiRuihan WuRui ZhuJidong ZhangShaik M ZakeeruddinHanying LiZe-Sheng LiMichael GrätzelPeng Wang
Published in: Chemistry (Weinheim an der Bergstrasse, Germany) (2018)
Modulating the structure and property of hole-transporting organic semiconductors is of paramount importance for high-efficiency and stable perovskite solar cells (PSCs). This work reports a low-cost peri-xanthenoxanthene based small-molecule P1, which is prepared at a total yield of 82 % using a three-step synthetic route from the low-cost starting material 2-naphthol. P1 molecules stack in one-dimensional columnar arrangement characteristic of strong intermolecular π-π interactions, contributing to the formation of a solution-processed, semicrystalline thin-film exhibiting one order of magnitude higher hole mobility than the amorphous one based on the state-of-the art hole-transporter, 2,2-7,7-tetrakis(N,N'-di-paramethoxy-phenylamine 9,9'-spirobifluorene (spiro-OMeTAD). PSCs employing P1 as the hole-transporting layer attain a high efficiency of 19.8 % at the standard AM 1.5 G conditions, and good long-term stability under continuous full sunlight exposure at 40 °C.
Keyphrases
  • perovskite solar cells
  • low cost
  • high efficiency
  • small molecule
  • room temperature
  • signaling pathway
  • water soluble
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  • ionic liquid
  • solar cells