Symmetric acridine bridging hole transport material for perovskite solar cell

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 pi-bridges. In this paper, we report a new HTM, ACR-Cz-DM, using 9,10-dihydroacridine (ACR) as a pi-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 con-version 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.

Automated summary

In this paper, a new electron donor ACR-Cz-DM is reported, which significantly improves the performance of perovskite solar cells. ACR-Cz-DM is constructed based on ACR and Cz-DM, exhibiting excellent hole mobility and conductivity, as well as good film formation and outstanding charge extraction and transport ability. The photoelectric conversion efficiency (PCE) of FAPbI3-based PSCs using ACR-Cz-DM as the electron donor reaches 21.37%, surpassing that of Spiro-OMeTAD-based PSCs (20.10%) under the same conditions.