Electronic coupling in organic-inorganic semiconductor hybrid structures with type-II energy level alignment

Abstract

Electronic coupling in a hybrid structure made of ZnMgO and a spirobifluorene derivative (SP6) is investigated in the situation where the energy level alignment at the organic/inorganic interface revealed by photoelectron spectroscopy is of type II. Charge separation caused by electron transfer from the SP6 lowest unoccupied molecular orbital to the conduction band of the semiconductor is observed. By collecting the photogenerated carriers in a ZnO quantum well, very efficient exciton transfer from the inorganic to the organic part occurs as well.