Formation of the Interfacial Dipole at Organic‐Organic Interfaces: C60/Polymer Interfaces

Conditions for spontaneous charge transfer across C60/polymer interfaces (in the ground state) are mapped out with aid of photoelectron spectroscopy. The polymers and C60 interact weakly, i.e., the electronic states of the organic semiconductors are coupled only by tunneling, which in turn results in transfer of complete charges across interfaces.