Charge Carrier Mobility in Fluorinated Phenoxy Boron Subphthalocyanines: Role of Solid State Packing

The electron mobilities in vapor-phase-deposited thin films of three fluorinated phenoxy boron subphthalocyanine (F5BsubPc, F12BsubPc, and F17BsubPc) molecules are measured using admittance spectroscopy. The mobilities are found to be field dependent, following a Poole–Frenkel type relation, and are in the range of ∼10–4 cm2 V–1 s–1 at typical operating field strengths for devices such as organic photovoltaic cells. A new F5BsubPc crystal polymorph (β-) is disclosed and its determination is critical to our ability to correlate charge carrier mobility and solid-state packing for each compound.