| Institution: | 1. Center for Chemistry of Novel & High-Performance Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310028 P. R. China;2. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 13002 P. R. China;3. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027 P. R. China;4. School of Chemistry, Beijing Institute of Technology, Beijing, 10081 P. R. China;5. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 13002 P. R. China;6. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland |
| Abstract: | 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. |
