Abstract
The photovoltaic action spectra of x-phase metal-free phthalocyanine (x-H/sub 2/Pc) with zinc oxide, cadmium sulfide, and electrolytic Schottky junctions were investigated in the near-infrared. Photocurrent measurements as a function of excitation wavelength, temperature, oxygen content, and light intensity are reported. A new photovoltaic response in the near-infrared (0.98 ..mu..m) was observed which is attributed to carrier generation following excitation of a surface charge-transfer state. A charge-transfer energy of 1.25 eV and activation energy for dissociation of the electron-hole pairs of 0.08 eV were determined. These results strongly indicate that exciton dissociation at surface states play an important role in mediating charge carrier generation in phthalocyanines.
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