27 September 2007 Electrical and photoelectrical properties of nickel phthalocyanine photovoltaic cells
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Abstract
The electrical and photoelectrical properties of oxygen doped films of nickel phthalocyanine photovoltaic cells have been studied using ohmic gold and blocking indium electrodes. DC conduction processes identified depend both on the polarity and on the electric field strength. Under forward bias (gold electrode positive), conductivity is ascribed to Schottky diode behaviour at lower fields and by space- charge-limited conductivity controlled by an exponential trap distribution at higher fields. Under reverse bias, the conduction process is interpreted in terms of an electrode-limited to a bulk limited transition. The photovoltaic parameters of the cells are evaluated from the current-voltage characteristics under illumination. Space charge concentrations and barrier heights are estimated from the capacitance-voltage measurements both in dark and under constant illumination. From the action spectra of the photocurrent it is concluded that the carrier generation process is wavelength independent.
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T. G. Abdel-Malik, Adly H. Elsayed, "Electrical and photoelectrical properties of nickel phthalocyanine photovoltaic cells", Proc. SPIE 6656, Organic Photovoltaics VIII, 665613 (27 September 2007); doi: 10.1117/12.728750; https://doi.org/10.1117/12.728750
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