Abstract
The surface photovoltage response was investigated in partly c-axis oriented Bi 4Ti 3O 12 thin film deposited on fluorine-doped tin oxide conductive glass substrate by a sol–gel technology. The maximum SPV of BiT film reaches 1.8 mV under the dc bias voltage (+1 V) and is three times larger than that under the zero bias. It is also found that the SPV response intensity increases with the increasing positive field, and the intensity of the SPV signal becomes weak with a reverse response when the negative field increases. It is suggested that the SPV is strongly related to the ferroelectric polarization.
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