Abstract
Carbazole derivatives are widely used as electron donors for the construction of hole transport materials (HTMs) for perovskite solar cells (PSCs), whose performance depends strongly on the structure and properties of the π-bridges. In this paper, we report a new HTM, ACR-Cz-DM, using 9,10-dihydroacridine (ACR) as a π-bridge and N3,N6-bis(9,9-dimethyl-9H-fluoren-2-yl)-N3,N6-bis(4-methoxyphenyl)-9H-carbazole-3,6-diamine (Cz-DM) as a peripheral electron donor. Cz-DM well satisfies the need of the ACR core for a peripheral donor with weak electron donation and high conjugation capacity. Owing to the excellent hole mobility and conductivity, good film formation and outstanding charge extraction and transport ability of ACR-Cz-DM, the photoelectric conversion efficiency (PCE) of FAPbI3-based PSCs using ACR-Cz-DM as HTM attained 21.37%, which is better than that of Spiro-OMeTAD-based PSCs (20.10%) under the same conditions. This work provides a promising demonstration of the design principles of ACR-based HTMs.
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