Experimental evidence of electronic polarization in a family of photo-ferroelectrics

Borkar, Hitesh; Rao, V. U. S.; Tomar, Monika; Gupta, Vinay; Scott, J. F.

doi:10.1039/c7ra00500h

Cited by 42 publications

(29 citation statements)

References 59 publications

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“…As a consequence of free charge generation by light, the sample becomes leakier FE with apparent increase in the both FE polarization and FE coercive force ( figure 1(b)). The observed light-induced change in the ferroelectric loop largely exceeds in magnitude all previous observations [29,[32][33][34]. The corresponding voltampere characteristics further illustrate the photoinduced change in electric properties ( figure 1(b)).…”

Section: Resultssupporting

confidence: 63%

Larger photovoltaic effect and hysteretic photocarrier dynamics in Pb[(Mg_1/3Nb_2/3)_0.70Ti_0.30]O₃ crystal

Makhort

Schmerber

Kundys

2019

Mater. Res. Express

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Following the recent discovery of a bulk photovoltaic effect in the Pb[(Mg 1/3 Nb 2/3 ) 0.68 Ti 0.32 ]O 3 crystal, we report here more than one order of magnitude improvement of photovoltaicity as well as its poling dependence in the related composition of lead magnesium niobate-lead titanate noted Pb[(Mg 1/3 Nb 2/3 ) 0.7 Ti 0.30 ]O 3 . Photocurrent measurements versus light intensity reveal a remarkable hysteresis in photocarrier dynamics clearly demonstrating charge generation, trapping and release processes. Experimental detailsThe crystals had (001) orientation supplied by Crystal-Gmbh (Germany) in square shape with edges along [010] and [100] directions ( figure 1(a) (inset)). Electrodes were formed with silver paste covering the edges in the planes parallel to zy. The hysteresis loop of polarization versus electric field was taken at room temperature by

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Section: Resultssupporting

confidence: 63%

Larger photovoltaic effect and hysteretic photocarrier dynamics in Pb[(Mg_1/3Nb_2/3)_0.70Ti_0.30]O₃ crystal

Makhort

Schmerber

Kundys

2019

Mater. Res. Express

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“…By contrast, the photoinduced increase of the polarization in KNBNNO ceramics has been proven to be constant and reproducible, where loops with the same increase of remanent polarization were obtained in the first six cycles of the measurement (Figure S2b, Supporting Information). The observed increase of the remanent polarization in ferroelectrics under illumination could result from three reasons—localized heating, optically induced charge migration due to increased photoconductivity, and photostimulated domain switching . The localized heating has been excluded in our case because the temperature‐dependent P – E loops showed negligible difference in polarization (Figure S4, Supporting Information).…”

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confidence: 86%

Boosting Photovoltaic Output of Ferroelectric Ceramics by Optoelectric Control of Domains

et al. 2018

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Photo‐ferroelectric single crystals and highly oriented thin‐films have been extensively researched recently, with increasing photovoltaic energy conversion efficiency (from 0.5% up to 8.1%) achieved. Rare attention has been paid to polycrystalline ceramics, potentially due to their negligible efficiency. However, ceramics offer simple and cost‐effective fabrication routes and stable performance compared to single crystals and thin‐films. Therefore, a significantly increased efficiency of photo‐ferroelectric ceramics contributes toward widened application areas for photo‐ferroelectrics, e.g., multisource energy harvesting. Here, all‐optical domain control under illumination, visible‐range light‐tunable photodiode/transistor phenomena and optoelectrically tunable photovoltaic properties are demonstrated, using a recently discovered photo‐ferroelectric ceramic (K0.49Na0.49Ba0.02)(Nb0.99Ni0.01)O2.995. For this monolithic material, tuning of the electric conductivity independent of the ferroelectricity is achieved, which previously could only be achieved in organic phase‐separate blends. Guided by these discoveries, a boost of five orders of magnitude in the photovoltaic output power and energy conversion efficiency is achieved via optical and electrical control of ferroelectric domains in an energy‐harvesting circuit. These results provide a potentially supplementary approach and knowledge for other photo‐ferroelectrics to further boost their efficiency for energy‐efficient circuitry designs and enable the development of a wide range of optoelectronic devices.

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“…The XRD patterns of as received LAO substrate is given separately in supplementary information (Suppl. [28] compared to the LNO coated rhombohedral LAO substrate (a = 3.79 Å, c = 13.11 Å) [29]. To explore the effect of strain on the ferroelectric and conductivity properties, the strain (ε) in the films due to lattice mismatch (or misfit) between bulk and thin film was calculated using equation; = × 100, where, ε is the lattice strain, a bulk is the lattice constant of the bulk, and a film is the lattice constant of the film.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Optically controlled polarization in highly oriented ferroelectric thin films

Borkar

Tomar

Gupta

et al. 2017

Mater. Res. Express

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The out-of-plane and in-plane polarization of (Pb 0.6 Li 0.2 Bi 0.2 )(Zr 0.2 Ti 0.8 )O 3 (PLBZT) thin film has studied in the dark and under illumination of a weak light source of a comparable bandgap. A highly oriented PLBZT thin film was grown on LaNiO 3 (LNO)/LaAlO 3 (LAO) substrate by pulsed laser deposition system which illustrates well-saturated polarization and its significant enhancement under illumination of light. We have employed two configurations for polarization characterization; first deals with out of plane polarization with single capacitor under investigation, whereas second demonstrates the two capacitors connected in series via the bottom electrode. Two different configurations were illuminated using different energy sources and their effects were studied. The latter configuration shows a significant change in polarization under illumination of light that may provide an extra degree of freedom for device miniaturization. The polarization was also tested using positive-up & negative-down (PUND) measurements which confirm robust polarization and their switching under illumination.

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Experimental evidence of electronic polarization in a family of photo-ferroelectrics

Abstract: Anomalous change in ferroelectric polarization under illumination of monochromatic light.

Cited by 42 publications

References 59 publications

Larger photovoltaic effect and hysteretic photocarrier dynamics in Pb[(Mg_1/3Nb_2/3)_0.70Ti_0.30]O₃ crystal

Larger photovoltaic effect and hysteretic photocarrier dynamics in Pb[(Mg_1/3Nb_2/3)_0.70Ti_0.30]O₃ crystal

Boosting Photovoltaic Output of Ferroelectric Ceramics by Optoelectric Control of Domains

Optically controlled polarization in highly oriented ferroelectric thin films

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Experimental evidence of electronic polarization in a family of photo-ferroelectrics

Abstract: Anomalous change in ferroelectric polarization under illumination of monochromatic light.

Cited by 42 publications

References 59 publications

Larger photovoltaic effect and hysteretic photocarrier dynamics in Pb[(Mg1/3Nb2/3)0.70Ti0.30]O3 crystal

Larger photovoltaic effect and hysteretic photocarrier dynamics in Pb[(Mg1/3Nb2/3)0.70Ti0.30]O3 crystal

Boosting Photovoltaic Output of Ferroelectric Ceramics by Optoelectric Control of Domains

Optically controlled polarization in highly oriented ferroelectric thin films

Contact Info

Product

Resources

About

Larger photovoltaic effect and hysteretic photocarrier dynamics in Pb[(Mg_1/3Nb_2/3)_0.70Ti_0.30]O₃ crystal

Larger photovoltaic effect and hysteretic photocarrier dynamics in Pb[(Mg_1/3Nb_2/3)_0.70Ti_0.30]O₃ crystal