Simple Yet Efficient: Arylamine-Terminated Carbazole Donors for Organic Hole Transporting Materials

摘要

The extraordinary electronic and structural properties of carbazole make it animportant donor for the molecular design of hole transport materials (HTMs).However, the development of peripheral carbazole donors has lagged behind.Herein, a series of low-cost arylamine-substituted carbazole donors are synthesizedby a one-step facile method. The effect of the terminal arylamine on theoptoelectronic, thermal stability, hole mobility, and photovoltaic properties of thestudied carbazole HTMs is also investigated. The diphenylamine- and carbazolesubstitutedcarbazoles possess the orthogonal–planar conformation, endowingthe HTMs (M142 and M143) with excellent electronic properties and morphologicalproperties. Consequently, power conversion efficiencies (PCEs) of 19.60%and 20.05% accompanied with a high photovoltage are achieved for M142- andM143-based doped devices, respectively, outperforming the controlled cellsbased on nonsubstituted carbazole HTM (M145, PCE ¼ 17.25%). Moreover, thedevices based on M143 exhibit good long-term storage, thermal, and lightstability. This work provides a simple strategy for molecular design in developingefficient carbazole donors.