Anomalous photoeffect

Referring back to Figure 13, the current-potential curves under illumination of the semiconductor simply appear shifted up relative to the dark i- V counterpart. This, however, is the ideal scenario. Anomalous photoeffects (APEs) are often observed that manifest as a cross-over of light and dark current-voltage curves, as illustrated in Figure 22. Thus, the superposition principle [241] is not obeyed in this instance. The dashed line in Figure 22 is produced by translating the photoeurrent-... 

Ferroelectric substances such as LiNb03 or BaTi03 were found to show anomalous photovoltaic effects (APV) of the order of 103-5 V83). A thin film of a ferroelectric polymer such as PVDF also was found to show APV effects84). Voc of 2.5 x 104 V and short circuit current (Isc) of the order of nA/cm2 were reported. Although the output is very small up to now1, it could be noticed as a specific photoeffect of a thin polymer film. 

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