Title :
A Ferroelectric Ultraviolet Detector With Constructive Photovoltaic Outputs
Author :
Gan, Bee Keen ; Yao, Kui ; Lai, Szu Cheng ; Goh, Phoi Chin ; Chen, Yi Fan
Author_Institution :
Inst. of Mater. Res. & Eng., Agency for Sci., Singapore, Singapore
fDate :
5/1/2011 12:00:00 AM
Abstract :
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 (Pb0.97La0.03)(Zr0.52Ti0.48)O3 (PLZT) thin film sandwiched between a (La0.7Sr0.3)MnO3 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.
Keywords :
Schottky barriers; ferroelectric devices; ferroelectric thin films; lanthanum compounds; lead compounds; photodetectors; semiconductor counters; strontium compounds; ultraviolet detectors; zirconium compounds; (La0.7Sr0.3)MnO3; (Pb0.97La0.03)(Zr0.52Ti0.48)O3; PLZT film; Schottky barrier; constructive photovoltaic effect; constructive photovoltaic output; depolarization electric field; electrode; ferroelectric thin film; ferroelectric ultraviolet detector; interfacial mechanism; interfacial space charge region; semiconductor photodetector; Detectors; Electrodes; Photoconductivity; Photovoltaic systems; Schottky barriers; Silicon; Ferroelectric devices; photodetectors; photovoltaic effects; thin films;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2011.2119461
