Polarization control and domain manipulation in ferroelectric films with uv light

Kholkin, A. L.; Iakovlev, S.; Baptista, J. M.

doi:10.1080/10584580108015678

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…Also, a noticeable decrease of the coercive voltage is obtained. Both phenomena are contradictory to previous observations [6,7]. In our case, the hysteresis shape becomes not broader but slimmer.…”

Section: Methodscontrasting

confidence: 85%

“…The small suppression of switchable polarization after UV illumination is explained by photocarrier trapping at domain boundaries with polarization discontinuities increasing again the domain wall pinning [1,2,5]. Note, that an opposite increase of the coercive voltage during and after UV illumination was found in [7]. Figure 2 shows the pyroelectric current spectra before and after UV illumination.…”

Section: Methodsmentioning

confidence: 89%

“…Charge trapping at polarization discontinuities stabilizes domain configurations which are ordinary unachievable in ferroelectric thin films. By using a proper combination of photoactive light illumination and external electric field energetically unstable domain configurations were created, for instance head-to-head and tail-to-tail configurations [1,7]. As far as both domain configuration and internal electric fields affect the ferroelectric-paraelectric phase transition [8], a shift of the ferroelectricparaelectric phase transition temperature to lower values and an increase of the optical gap E 03 (obtained from isoabsorption curves at an absorption coefficient of α = 1000 cm −1 ) was detected under UV illumination in self-polarized PZT thin films [9].…”

Section: Introductionmentioning

confidence: 99%

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UV-INDUCED CHANGES OF THE POLARIZATION PROFILE OF Pb(Zr,Ti)O₃ THIN FILMS

Suchaneck

Lin

Gerlach

et al. 2005

Integrated Ferroelectrics

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Self-polarized lead-enriched Pb(Zr,Ti)O 3 films were deposited in which a fraction of the Zr sites are occupied by Pb 4+ ions. Peculiarities of photo-induced changes in the ferroelectric hysteresis and the pyroelectric coefficient profile of these films were investigated. UV illumination decreases the voltage required to reorient the domains and increases the spontaneous polarization. After illumination switch-off space charge layers of trapped electrons were formed and the switchable polarization was partially suppressed. The localization of the trapped space charges is determined by the light absorption coefficient.

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Section: Methodscontrasting

confidence: 85%

Section: Methodsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

UV-INDUCED CHANGES OF THE POLARIZATION PROFILE OF Pb(Zr,Ti)O₃ THIN FILMS

Suchaneck

Lin

Gerlach

et al. 2005

Integrated Ferroelectrics

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show abstract

“…Both, the phase transition shift to the lower temperatures and the increase the E 03 under UV illumination give evidence that UV light produces a strong internal electric field. The origin of this local internal field is attributed to trapping and detrapping of mobile charge carriers [12,13]. As a consequence, the phase transition temperature is changed by the strong internal electric field [14].…”

Section: Resultsmentioning

confidence: 99%

Phase Transition Shift in Lead-Excess PZT Films Under UV Illumination

Deyneka

Suchaneck

Jastrabı́k

et al. 2004

Integrated Ferroelectrics

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Self-polarized PZT are ferroelectrics with a preferred polarization orientation at room temperature and becomes a paraelectric at high temperatures of about 460 • C. The ferroelectric-paraelectric phase transition temperature depends on stoichiometry of the PZT material and therefore on preparation technology. In this work, we present an ellipsometric study of lead excess Pb 1+x Zr 0.235 Ti 0.765 O 3 (PZT) films exhibiting a strong self-polarization in the temperature range of 20 to 500 • C under UV illumination. We obtained a shift of the ferroelectric-paraelectric phase transition temperature to lower values and an increase of the optical gap E 03 . The temperature dependences of the optical gap E 03 , the refractive index and the absorption coefficient at fixed wavelengths were determined.

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“…5−7 Remarkably, light-induced local polarization switching and domain-wall motion have been observed in inorganic ferroelectrics through the photoexcited thermal (e.g., thermoelectricity and pyroelectricity) and electronic (e.g., photovoltaic and photoinduced flexoelectricity) effects, 8−11 not to mention photoinduced poling and domain manipulation in ferroelectric thin films. 12,13 By virtue of their high structural tunability and versatility, solid-state molecule-based ferroelectrics and pyroelectrics are promising platforms for the optical manipulation of ferroic orders. 14−17 Significant breakthroughs in this field have been made by the discovery of a correlation between the ferroelectric properties and light−triggered structural changes in a series of photochromic pure organic ferroelectric crystals.…”

Section: ■ Introductionmentioning

confidence: 99%

Molecular Design of a Metal-Nitrosyl Ferroelectric with Reversible Photoisomerization

García

et al. 2023

J. Am. Chem. Soc.

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The development of photo-responsive ferroelectrics whose polarization may be remotely controlled by optical means is of fundamental importance for basic research and technological applications. Herein, we report the design and synthesis of a new metal-nitrosyl ferroelectric crystal (DMA)(PIP)[Fe(CN)5(NO)] (1) (DMA = dimethylammonium, PIP = piperidinium) with potential phototunable polarization via a dual-organic-cation molecular design strategy. Compared to the parent non-ferroelectric (MA)2[Fe(CN)5(NO)] (MA = methylammonium) material with a phase transition at 207 K, the introduction of larger dual organic cations both lowers the crystal symmetry affording robust ferroelectricity and increases the energy barrier of molecular motions, endowing 1 with a large polarization of up to 7.6 μC cm–2 and a high Curie temperature (T c) of 316 K. Infrared spectroscopy shows that the reversible photoisomerization of the nitrosyl ligand is accomplished by light irradiation. Specifically, the ground state with the N-bound nitrosyl ligand conformation can be reversibly switched to both the metastable state I (MSI) with isonitrosyl conformation and the metastable state II (MSII) with side-on nitrosyl conformation. Quantum chemistry calculations suggest that the photoisomerization significantly changes the dipole moment of the [Fe(CN)5(NO)]2– anion, thus leading to three ferroelectric states with different values of macroscopic polarization. Such optical accessibility and controllability of different ferroelectric states via photoinduced nitrosyl linkage isomerization open up a new and attractive route to optically controllable macroscopic polarization.

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Polarization control and domain manipulation in ferroelectric films with uv light

Cited by 6 publications

References 12 publications

UV-INDUCED CHANGES OF THE POLARIZATION PROFILE OF Pb(Zr,Ti)O₃ THIN FILMS

UV-INDUCED CHANGES OF THE POLARIZATION PROFILE OF Pb(Zr,Ti)O₃ THIN FILMS

Phase Transition Shift in Lead-Excess PZT Films Under UV Illumination

Molecular Design of a Metal-Nitrosyl Ferroelectric with Reversible Photoisomerization

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Polarization control and domain manipulation in ferroelectric films with uv light

Cited by 6 publications

References 12 publications

UV-INDUCED CHANGES OF THE POLARIZATION PROFILE OF Pb(Zr,Ti)O3 THIN FILMS

UV-INDUCED CHANGES OF THE POLARIZATION PROFILE OF Pb(Zr,Ti)O3 THIN FILMS

Phase Transition Shift in Lead-Excess PZT Films Under UV Illumination

Molecular Design of a Metal-Nitrosyl Ferroelectric with Reversible Photoisomerization

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Product

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UV-INDUCED CHANGES OF THE POLARIZATION PROFILE OF Pb(Zr,Ti)O₃ THIN FILMS

UV-INDUCED CHANGES OF THE POLARIZATION PROFILE OF Pb(Zr,Ti)O₃ THIN FILMS