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

Volume

32

Issue

5

fYear

2011

fDate

5/1/2011 12:00:00 AM

Firstpage

665

Lastpage

667

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 (Pb_0.97La_0.03)(Zr_0.52Ti_0.48)O₃ (PLZT) thin film sandwiched between a (La_0.7Sr_0.3)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; (La_0.7Sr_0.3)MnO₃; (Pb_0.97La_0.03)(Zr_0.52Ti_0.48)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;

fLanguage

English

Journal_Title

Electron Device Letters, IEEE

Publisher

ieee

ISSN

0741-3106

Type

jour

DOI

10.1109/LED.2011.2119461

Filename

5750019