Controlling Molecular Packing for Charge Transport in Organic Thin Films

Tuning of the packing mode , including the film morphology, molecular orientation, and phase state of chloroaluminum phthalocyanine (ClAlPc), is demonstrated, and yields optimal parallel and vertical channels for charge transport. On a pure SiO 2 surface, the ClAlPc molecules lie flat and grow in the Volmer–Weber mode, resulting in a cone‐array structure that is highly desirable for heterojunction organic solar cells and organic field emission. On an OTS‐modified surface, the ClAlPc molecules stand obliquely and Stranski–Krastanov growth of a continuous and flat film occurs, which is suitable for organic transistors.