In this letter, Au/tanylphthalocyanine/GaAs diodes incorporating ultrathin films of the archetypal organic semiconductor titanylphthalocyanine were investigated by ballistic electron emission microscopy (BEEM)/spectroscopy. The presence of the organic semiconductor increases the BEEM threshold voltage compared to reference diodes. The Schottky barrier heights were measured for various temperatures and show an approximately linear increase from at room temperature to at .
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