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MgO thin films as a protective layer in plasma display panels (PDPs) were
deposited by an advanced ion-plating (AIP) apparatus that we had developed.
The AIP method enables plasma operation at low-pressures of 10−3
Pa. The MgO thin films were mainly (111) oriented with a small amount of
randomly oriented textures. The preferred orientation of the films was
dependent on deposition conditions; oxygen content and substrate
temperature. Fine columnar structures grew with sharp apexes at the film
surface. Secondary electron emission coefficient from a film deposited by
the AIP method was higher than that by a conventional electron beam
evaporation method. The MgO protective layer could be expected to improve
PDPs by our AIP deposition.
Heteroepitaxial growth of CaxSr1-xF2 layers on Si (100) substrates by molecular beam epitaxy has been investigated for GaAs / fluoride / Si structures. The Si (100) substrates off-oriented toward  show no considerable influence on crystallinity of CaF2 and SrF2 epitaxial layers. The off - oriented substrates, however, influence a remarkable effect on CaxSr1-xF2 layers, resulting in poor crystallinity rather than good one. This influence of off-oriented Si (100) substrates on the heteroepitaxy of CaxSr1-xF2 layers was the opposite of that found in GaAs/Si (100) structures.
Photo-leakage-current of poly-Si (polycrystalline Si) TFFs has been investigated by using the rear irradiation OBIC (Optical Beam Induced Current) method. In the case of the offset gate TFIs, it was found that the photo-leakage-current was generated in the offset region of the drain electrode side. In order to reduce the photo-leakage-current, low concentration phosphor (P) was doped in the offset region, which corresponds to LDD (Lightly Doped Drain) structure. In the LDD TFT, the photo leakage current at the offset region decreased remarkably, because of the reduction of hole transportation in this region.
A new kind of amorphous indium tin oxide (ITO) film with good pattern delineation properties and mass production capability, as well as low resistivity and high transparency has been developed. The film was prepared by a cluster-type DC magnetron sputtering apparatus at room temperature with H2O addition to the argon sputtering gas. The amorphous ITO film quality was improved by effective termination of oxygen vacancies with -OH species generated by enhanced decomposition from the added H2O in the plasma.
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