The photovoltaic and rectification properties of junctions of copper phthalocyanine (CuPc) with metals—Pd, Pt, Au, Cu, In, Al, and Mg—are investigated. Current‐voltage characteristics are explained by thep‐type nature of copper phthalocyanine that gives rise to a Schottky barrier, which changes with the metal work function. The action spectrum of the photovoltaic effect suggests that the light absorbed only in the space charge layer of CuPc near the interface effectively contributes to the carrier generation. It is concluded that the reversible influence of hydrogen on the current‐voltage curve and the photovoltaic effect found for the Pd‐CuPc junctions are due to changes in barrier height between Pd and CuPc resulting from changes in the work function of Pd.
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