TITLE

Photodiode properties of epitaxial Pb(Ti, Zr)O[sub 3]/SrTiO[sub 3] ferroelectric heterostructures

AUTHOR(S)
Watanabe, Yukio; Okano, Motochika
PUB. DATE
March 2001
SOURCE
Applied Physics Letters;3/26/2001, Vol. 78 Issue 13, p1906
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A substantial photovoltaic effect is found in heterostructures of typical ferroelectric oxides. Pb(Ti, Zr)O[sub 3]/Nb-doped SrTiO[sub 3], especially, exhibits current-voltage characteristics of the photovoltaic effect of a typical pn junction (p: hole carrier type, n: electron carrier type). A preliminary nonoptimized device shows high performance such as open circuit voltage of 0.7-0.8 V, external conversion efficiency of 0.6%-0.8%, and response time faster than 20 μs for ultraviolet light at room temperature, suggesting the potential of this diode as a new class of photodiode. The results support the formation of a pn like junction by ferroelectric oxides. Additionally, the photovoltaic characteristics are tuned by the application of short pulse voltages and retained. © 2001 American Institute of Physics.
ACCESSION #
4711164

 

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