Orbital promises: Frontier orbital analyses showed that the small lambda(+) value of 8,17-di-n-hexylbenzo[1,2-k;4,5-k']difluoranthene (DH-BDF) is owed to the nonbonding character of the BDF framework. The calculated adiabatic ionic potential and hole mobility indicates that this compound is a p-type air-stable organic field-effect transistor, which promises to be a soluble, stable and high-performance p-type organic semiconductor.