New hole transport materials with 1,2-dimethoxyphenyl as the terminal groups

作者：Ji, Yu; Wang, Rui; Shan, Yahan; Wu, Fei^*; Zhu, Linna^*

来源：Synthetic Metals, 2018, 244: 150-154.

DOI：10.1016/j.synthmet.2018.07.017

• Hole transport materials
• Perovskite solar cells
• 1,2-Dimethoxyphenyl
• Terminal groups
• Power conversion efficiency

Two new compounds (J1 and J2) are synthesized and used as hole transport materials (HTMs) for perovskite solar cells (PSCs). In J1 and J2, 1,2-dimethoxyphenyl is used as the terminal group, with tetraphenyl ethylene and 9,9'-spirobi[9H-fluorene] ring as the core structure, respectively. Compared to the commonly used methoxyl end group, there are two methoxyl units on 1,2-dimethoxyphenyl, which enhances the electron-donating ability of the end groups. Additionally, the introduced phenyl ring could extend pi conjugation of the whole molecule, which is favorable for electron delocalization and charge transporting. Planar PSCs are fabricated, and J2-based device shows a power conversion efficiency (PCE) of 15.07%, with a short-circuit current density (J(sc)) of 20.37 mA cm(-2), an open-circuit voltage (V-oc) of 1020 mV and a fill factor (FF) of 0.73.

• 出版日期2018-10
• 单位西南大学