Two common hole transporting materials, -tris(-3-methylphenyl--phenyl-amino) triphenylamine (MTDATA) and -diphenyl--bis(1-naphthyl) (-biphenyl)-diamine (NPB), and a -type dopant tetrafluorotetracyanoquinodimethane were used to build various hole-only heterojunction devices. Both experimental results and theoretical modeling show that the current flow in such devices is limited by the heterojunction potential barrier or band offset at the MTDATA/NPB interface. It was found that the device current flow can be modulated to increase or decrease dramatically by introducing a -doped or interlayer, respectively. The observed phenomena were discussed using quasi-Fermi energy level realignment at the doped/undoped organic-organic interface.
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