Communications in the regenerated cellulose layer. We suppose that the hydrophobic disiloxane segregates from the hydrophilic cellulose film to the gas phase.The X-ray reflection analysis (Fig. 2 (bottom)) of the regenerated cellulose film exhibits Kiessig fringes, but no Bragg signal. From the periodical intensity modulations one calculates a film thickness of 79 A and a surface roughness of 8 A. Although the film thickness decreased by 60 YO during
A ferroelectric-superconducting photodetector has been developed and characterized. An atomically ordered PbZrTiO3 (PZT) ferroelectric gate was grown over a c-oriented YBa2Cu3O7−x (YBCO) high Tc superconductor substrate by excimer laser deposition. Irradiation of the PZT gate with photons near the ferroelectric gap energy resulted in a measurable change of the drain-source photocurrent with the device at a temperature near Tc of the YBCO. The critical temperature of the YBCO base was shifted up to 4 K when the PZT gate was irradiated with photon flux of wavelength from 300 to 500 nm. A responsivity of 360 A/W was measured and an upper bound on response time to optical irradiation of 100 ns was determined.
The low-temperature photoresponse properties for a PbZrxTi1−xO3/YBa2Cu3O7−x thin-film heterostructure capacitor are reported. The fast optical readout effect measured for the device while the YBCO bottom electrode was superconducting indicates a fall time dependent on YBCO state. A simple equivalent circuit model confirmed that the temperature dependence of the YBCO electrode resistance is responsible for the variation of the fall time of the optical readout signal. Such heterostructures can be used to fabricate high power, radiation-hard optical sensors which cover the whole visible range.
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