Barrier photovoltaic effects in PZT ferroelectric thin films

Yarmarkin, V. K.; Гольцман, Б. М.; Казанин, М. М.; Lemanov, V. V.

doi:10.1134/1.1131242

Cited by 47 publications

(22 citation statements)

References 12 publications

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“…The ferroelectric photovoltaic effect was observed in BaTiO 3 in 1956 ͑Ref. 13 However, very lim-ited studies were on the thickness dependence of photocurrent for PLZT materials. 2 In 1974, Glass et al developed an equation to describe the relationship between the photocurrent density J and absorbed power density ␣I ͑where ␣ is the optical absorption coefficient and I is the light intensity͒ and introduced the Glass coefficient ͑Glass law J = ␣I͒.…”

Section: Introductionmentioning

confidence: 99%

Thickness effects on photoinduced current in ferroelectric (Pb0.97La0.03)(Zr0.52Ti0.48)O3 thin films

Qin

Yao

Liang

et al. 2007

Journal of Applied Physics

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Photovoltaic characteristics in polycrystalline and epitaxial ( Pb 0.97 La 0.03 ) ( Zr 0.52 Ti 0.48 ) O 3 ferroelectric thin films sandwiched between different top and bottom electrodes Structure and properties of W O 3 -doped Pb 0.97 La 0.03 ( Zr 0.52 Ti 0.48 ) O 3 ferroelectric thin films prepared by a sol-gel process J. Appl. Phys. 98, 034104 (2005); 10.1063/1.1999834 Effects of WO 3 dopant on the structure and electrical properties of Pb 0.97 La 0.03 ( Zr 0.52 Ti 0.48 ) O 3 thin films Appl.Ferroelectric ͑Pb 0.97 ,La 0.03 ͒͑Zr 0.52 ,Ti 0.48 ͒O 3 thin films in different thicknesses were fabricated on Pt/ Ti/ SiO 2 / Si substrates through a sol-gel process. Film thickness dependence of photoinduced current was investigated under the illumination of ultraviolet light. A theoretical model was developed to describe the thickness-dependent photocurrent. Both the theoretical model and experimental results showed that the photocurrent increases exponentially with the decrease in film thickness. However, photocurrent may drop in the films with the very small thickness of tens of nanometers and below in which the small size effect of ferroelectricity is considered. This model also reveals the relationship between the photocurrent and the internal electric field or remnant polarization and predicts a small diffusion current in the opposite direction at very low field or polarization region. These results provide useful guides for the design of ferroelectric film photovoltaic devices.

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Section: Introductionmentioning

confidence: 99%

Thickness effects on photoinduced current in ferroelectric (Pb0.97La0.03)(Zr0.52Ti0.48)O3 thin films

Qin

Yao

Liang

et al. 2007

Journal of Applied Physics

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“…Such a mechanism had already been postulated in 2000 to explain the photovoltaic effect in PZT(48/52). [69] On a similar note, Yang et al observed an enhancement by a factor of 2 of the photovoltage and photovoltaic current in BiFeO 3 single crystals grown with different orientations, domain patterns, or even different laboratories, by using photons carrying subbandgap energy. [70] Such enhancement was attributed to a simple electronic pumping of sub-bandgap levels situated at 2.2 eV, as the spectral photoconductive response exhibit an important response in the area between 2.2 and 2.6 eV (see Figure 10a).…”

Section: Defects: Friend or Foe?mentioning

confidence: 92%

Photovoltaics with Ferroelectrics: Current Status and Beyond

et al. 2016

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Ferroelectrics carry a switchable spontaneous electric polarization. This polarization is usually coupled to strain, making ferroelectrics good piezoelectrics. When coupled to magnetism, they become so-called multiferroic systems, a field that has been widely investigated since 2003. While ferroelectrics are birefringent and non-linear optically transparent materials, the coupling of polarization with optical properties has received, since 2009, renewed attention, triggered notably by low-bandgap ferroelectrics suitable for sunlight spectrum absorption and original photovoltaic effects. Consequently, power conversion efficiencies up to 8.1% were recently achieved and values of 19.5% were predicted, making photoferroelectrics promising photovoltaic alternatives. This article aims at providing an up-to-date review on this emerging and rapidly progressing field by highlighting several important issues and parameters, such as the role of domain walls, ways to tune the bandgap, consequences arising from the polarization switchability, and the role of defects and contact electrodes, as well as the downscaling effects. Beyond photovoltaicity, other polarization-related processes are also described, like light-induced deformation (photostriction) or light-assisted chemical reaction (photostriction). It is hoped that this overview will encourage further avenues to be explored and challenged and, as a byproduct, will inspire other research communities in material science, e.g., so-called hybrid halide perovskites.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] However, the stability of photovoltaic output in ferroelectric thin films has not been paid attention. Device applications seem not possible without clarifying the relevant mechanism and having the stability issue solved.…”

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confidence: 99%

Stability of photovoltage and trap of light-induced charges in ferroelectric WO3-doped (Pb0.97La0.03)(Zr0.52Ti0.48)O3 thin films

Qin

Yao

Liang

et al. 2007

Applied Physics Letters

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The stability of photovoltage in WO3-doped (Pb0.97La0.03)(Zr0.52Ti0.48)O3 (PLWZT) ferroelectric thin films was investigated. For in-plane polarized configuration, with a greatly enhanced electrode gap, the reduction ratio of photovoltage during multicycle UV illumination was significantly smaller and stability of photovoltage was greatly improved over the sandwich capacitor configuration. The ferroelectric-metal interfacial effects including Schottky barriers and polarization screening due to the trap of photoinduced charges at interfaces were found to determine the magnitude, stability, and even the polarity of the photovoltage, particularly for the electrode-sandwiched PLWZT thin films.

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Barrier photovoltaic effects in PZT ferroelectric thin films

Cited by 47 publications

References 12 publications

Thickness effects on photoinduced current in ferroelectric (Pb0.97La0.03)(Zr0.52Ti0.48)O3 thin films

Thickness effects on photoinduced current in ferroelectric (Pb0.97La0.03)(Zr0.52Ti0.48)O3 thin films

Photovoltaics with Ferroelectrics: Current Status and Beyond

Stability of photovoltage and trap of light-induced charges in ferroelectric WO3-doped (Pb0.97La0.03)(Zr0.52Ti0.48)O3 thin films

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