Bipolar‐charge‐transporting organic photoconductors

A new class of bipolar‐charge‐transporting molecularly‐doped polymers has been developed. The materials are ternary solid solutions comprised of 3,5‐dimethyl‐3’,5’‐di‐tert‐butyl‐4,4’‐diphenoquinone (MBDQ), N,N,N’,N’‐tetrakis (m‐methylphenyl)‐1, 3‐diaminobenzene (PDA), and poly(4,4’‐cyclohexylidenediphenyl carbonate) (PC‐Z). No charge‐transfer complexation occurs between the MBDQ and PDA. As a result the MBDQ and PDA function independently as electron and hole transport manifolds, respectively. Both electrons and holes can be injected into these materials from titanylphthalocyanine (TiOPc). In addition, it has been observed that the presence of MBDQ and PDA enhances the charge separation efficiency of the TiOPc.

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