The influence of macroscopic inhomogenities on charge transport in ferroelectric crystal LiNbO3
| Autor: | V. K. Malinovsky, Alexey M. Pugachev, I. F. Kanaev, A. V. Novomlintsev |
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| Rok vydání: | 1998 |
| Předmět: |
Materials science
Holographic grating Condensed matter physics business.industry Holography Physics::Optics Charge (physics) Condensed Matter Physics Interference (wave propagation) Electronic Optical and Magnetic Materials law.invention Crystal Amplitude law Distortion Optoelectronics Diffusion (business) business |
| Zdroj: | Ferroelectrics. 214:307-315 |
| ISSN: | 1563-5112 0015-0193 |
| DOI: | 10.1080/00150199808220270 |
| Popis: | The amplitude of photoinduced holographic gratings in LiNbO3 crystals has been found to be considerably reduced by decreasing the distance between the interference maxima. It is proved that this is related to microscopic structural defects which are relevant for the charge transfer processes. Absorbing light, the defect regions provide free charges for the crystal, being both the charge sources and drains. The distances between the drains limit the spatial resolution of a holographic grating. Because of distortion of spontaneous polarization by defects a net of potential barriers is formed. The barriers limit and skew the diffusion and drift transfers. A model is suggested relating the photovoltaic current in ''homogeneous'' ferroelectrics with macroscopic inhomogeneities. |
| Databáze: | OpenAIRE |
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