Photoelectric properties of organic polysilane containing carbazolyl side groups

The photoelectric properties of a series of N-carbazolyl-substituted silane copolymers have been studied by optical absorption, photoluminescence, and time-of-flight transient photocurrent measurements. It is found in N-carba zolyl-substituted silane copolymers that the optical absorption and the pho toluminescence bands of the carbazolyl side groups, superimposed on those o f the Si backbones, are observed in the blue to ultraviolet spectrum region . The hole drift mobilities of the copolymers are essentially the same as t hose of polymethylphenylsilane (PMePhSi) and are higher than those of poly( N-vinylcarbazole), and the photocarrier generation efficiencies of the copo lymers are higher than those of PMePhSi. These results indicate that the ph otogenerated charge carriers on the carbazolyl side groups transfer to the Si backbones and then proceed through the Si backbones. (C) 2000 American I nstitute of Physics. [S0003-6951(00)03940-1].