The study of new p-n mixed semiconductors: 6,13-Bis(4-propylphenyl)pentacene-ZnO nano-sized composites films

A series of 6,13-bis(4-propylphenyl)pentacene(BPP)-ZnO nano-sized composites were successfully constructed and characterized by UV-vis spectra, infrared spectra, X-ray diffraction spectra, cyclic voltammetry, X-ray photoelectric spectra, etc. These characterizations proved that an interaction between the BPP and ZnO happened, leading to the generation of p-n mixed semiconductors with many new properties. The forbidden band gaps of prepared semiconductors are among 1.09-1.29 eV, which are much smaller than that of BPP and ZnO. From the comparison of BPP-ZnO nano-sized composites with some other related composites, it was found that the forbidden band gap of p-n mixed semiconductor becomes smaller as the forbidden band gap of pentacene derivative decreases.