The Nature Of The Lsco Thin Film Conductive Properties Of Laser-induced Voltage

La_0.5Sr_0.5CoO₃ has being applied in fuel cells, gas sensors and as electrodes in ferroelectric memories due to its relatively high electronic and ionic conductivity. Since La_0.5Sr_0.5CoO₃ has a pseudo-cubic perovskite structure, excellent structural companionate with Pb-based oxide perovskite ferroelectrics, La_0.5Sr_0.5CoO₃ been used as the electrode, which can improve the fatigue of ferroelectric memory cells. So the future of the La_0.5Sr_0.5CoO₃ as a conductive material is hopefully.We prepared the La_0.5Sr_0.5CoO₃ films on SiO₂/Si (004), SiO₂/Si (111) and LaA1O₃ substrates by pulsed laser deposition method using the high quality La_0.5Sr_0.5CoO₃ polycrystalline targets. The growth conditions, structures, surfaces morphology and resistance of the films. We studied the dependences between the resistance and humidity, temperature. Moreover, we detected the laser induced thermoelectric voltage in the La_0.5Sr_0.5CoO₃ films on vicinal LaAlO₃ substrates.The main results and conclusions include:1. We measured and calculated the resistivity of the La_0.5Sr_0.5CoO₃ target, and provided the reliable data.2. We studied the condition of the La_0.5Sr_0.5CoO₃ growth on SiO₂/Si (004), SiO₂/Si(111) LaA1O₃ substrates. We get the film which is preferential orientation on SiO₂/Si substrates. We calculated the films' resistivity. We also get the La_0.5Sr_0.5CoO₃ films which is grown epitaxial on LaAlO₃ substrates.3. We observed the change of La_0.5Sr_0.5CoO₃ /SiO₂/Si films' resistence when the film was immersed in the water and analyzed the possible reason of the change.4. We get the dependence between resistence and temperature and humidity of the La_0.5Sr_0.5CoO₃ target and the La_0.5Sr_0.5CoO₃/SiO₂/Si films.5. We find that the La_0.5Sr_0.5CoO₃ films on the gradient LaAlO₃ substrates have LITV effective. And we find that the LITV response time is shorter than the LaCaMnO₃ film's. In addition, we find the LITV effect on the La_1-xSr_xCoO₃ films(x=0.3, 0.6) which are grown on the gradient LaAlO₃ substrates.