A Ferroelectric Ultraviolet Detector With Constructive Photovoltaic Outputs

Photovoltaic outputs in semiconductor photodetectors are typically generated at an interfacial space charge region. Here, the output of our ultraviolet detector was enhanced by incorporating a photovoltaic output over the bulk of a ferroelectric thin film for providing a constructive photovoltaic effect in addition to the response from the interfacial mechanism. The working principle was demonstrated with a ferroelectric (Pb
_0.97
La
_0.03
)(Zr
_0.52
Ti
_0.48
)O
₃
(PLZT) thin film sandwiched between a (La
_0.7
Sr
_0.3
)MnO
₃
top electrode and a Pt bottom electrode, in which the depolarization electric field in the PLZT film was in the same direction with that at the Schottky barrier at the PLZT/Pt interface to realize the constructive photovoltaic effect.