Percolative behavior of transient photoconductivity in metal-free phthalocyanine nanocrystals

Transient photoconductivity in metal-free phthalocyanine (H2Pc) nanocrystals dispersed in a polyester matrix is investigated. The H2Pc nanocrystals concentration dependence of transient photoconductivity is examined above the percolation threshold at different temperatures. It is found that the disorder parameter is independent of temperature and increases with concentration of H2Pc nanocrystals. These findings can successfully be explained by percolative behavior of photocarriers on geometric fractals.