Abstract
Synergism in photocurrent observed with vacuum-sublimed films of zinc tetraphenylporphyrin (ZnTPP) is described in detail. The photocurrent synergism appears when a ZnTPP thin film sandwiched between two dissimilar metals is illuminated simultaneously with visible (VIS) and near-infrared (NIR) light. The magnitude of the synergism (η) at a fixed VIS light depends on the wavelength of the NIR light, which is not appreciably absorbed by the ZnTPP film, whereas the response of η to varying wavelengths of VIS light at a fixed NIR light exhibits a peak at 430 nm, where the ZnTPP film absorbs light most intensively. In addition to these η spectrum measurements, dependences of η on the intensities of the 430 nm and NIR light, film thickness, and bias voltage are examined for clarification of the mechanism of the synergistic effect.
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