Enhancement of pyroelectric signal by continuous ultraviolet illumination of epitaxial Pb(Zr{sub 0.2}Ti{sub 0.8})O{sub 3} films

Journal Article · Mon Sep 29 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4896855· OSTI ID:22350809

Pintilie, L.; Iuga, A. ^[1]; Botea, M. ^[1]

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1. National Institute of Materials Physics, Atomistilor 105bis, Magurele, Ilfov 077125 (Romania)

The pyroelectric signal generated by an epitaxial Pb(Zr{sub 0.2}Ti{sub 0.8})O{sub 3} film can be enhanced by continuous illumination with ultraviolet (UV) light. The measured signal increases more than 2 times at low modulation frequencies of the incident infrared (IR) radiation (∼10 Hz) and at wavelengths where the short-circuit photocurrent presents the maximum value (∼280–300 nm). The tentative explanation is that the changes in polarization induced by the temperature variation under modulated IR illumination are generating a variable internal electric field, able to collect the photogenerated carriers produced under continuous UV illumination leading to an additional signal in phase with the pyroelectric one. This finding could be exploited for designing pyroelectric detectors with enhanced characteristics by combining both UV and IR responses.

• OSTI ID: 22350809
• Journal Information: Applied Physics Letters, Vol. 105, Issue 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARRIERS
ELECTRIC FIELDS
ELECTRICAL FAULTS
EPITAXY
FILMS
ILLUMINANCE
INFRARED RADIATION
LEAD COMPOUNDS
MODULATION
OXYGEN COMPOUNDS
POLARIZATION
PYROELECTRIC DETECTORS
TITANIUM COMPOUNDS
ULTRAVIOLET RADIATION
WAVELENGTHS
ZIRCONIUM COMPOUNDS