Abstract
An electroabsorption (EA) study is carried out at an electric-field modulation frequency ωm/(2π) of 1 Hz for two types of typical organic Schottky-barrier cell, namely, Au/Zn-phthalocyanine (ZnPc)/Al and Au/ZnPc/In/Al, in order to elucidate the role of the inner electric field in photocurrent (Iphoto) generation. From the bias dependence of the 1F- and 2F-EA intensities measured at the frequencies of ωm and 2ωm, respectively, it is shown that the inner electric field E0 as well as the modulation electric field Em is quenched in the ZnPc layer with a forward bias larger than ∼1 V. For Au/ZnPc/Al, a good correlation is observed between E0 and Iphoto, which indicates that Iphoto is generated by E0. For Au/ZnPc/In/Al, on the other hand, no correlation is observed between E0 and Iphoto. An interpretation of the latter is that Iphoto is caused by an increase in charge-injection probability at the ZnPc/In interface as a result of the trapping of photogenerated charges in the interface region. For both systems, the depletion layer is detected by capacitance-voltage measurement at 0.2 Hz.
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