Ionization Potential Dependence of Photoconductive Properties of Polysiloxanes Bearing Hole-Conductors Sensitized with C₆₀

Abstract

Photo-charge generation efficiencies and photoconductivities were measured at 632.8 nm in a series of polysiloxanes bearing hole-conductors doped with C₆₀ as sensitizer. Generation and transport of mobile carriers were strongly dependant on the charge-transfer (CT) complex formed between the hole conducting polymer and the sensitizer. We investigated the dependence of the ionization potential of hole conducting polymer on the photoconductive properties of the CT complex. The composite containing polymer with lower ionization potential had the highest photo-charge generation efficiency and photoconductivity.

Keywords:

• Hole conducting polymer
• ionization potential
• photo-charge generation efficiency
• photoconductivity

Acknowledgment

This work was supported by the National Research Foundation (NRF) grant funded by the Korea government (MEST) through the Active Polymer Center for Pattern Integration (No. R11-2007-050-00000-0).