Preparation And Applications Of Fast Ion Transport Layer Films Used In Electrochromic Devices

As a kind of optical modulation device,the application value of electrochromic devices(ECDs)in environmental protection and energy saving has been affirmed by the public.In recent ten years,the research of all-solid-state ECDs are mostly about two kinds of ion transmission devices,which are H+and Li+.The ECDs based on H+transmission use the external injection of H+ to provide small size ions to ECDs for transmission,while devices which are directly designed ion storage structures tend to employ more H+-containing gels as ion storage layers.In addition,there is also a method of ion transmission by incorporating H+ into a fast ion conductor by vapor deposition.The first two methods of ECDs are big tests for the film's adaptability and long-term stability,and doping H+ process is not only complicated but dangerous.The same problem exists in the study of lithium ion transmission ECDs.Although a few studies have made solid-state lithium-ion electrolyte thin films as ion storage layers for allsolid-state ECDs,the devices tend to perform poorly due to the neglect of the electron confinement process within the device.Fast ion transport layer TaOx films of inorganic all-solid-state complementary electrochromic devices(IASSC-ECD)are prepared by reactive magnetron sputtering.The influences of sputtering power,deposition time and reaction atmosphere on the phase structure,overall morphology,optical and electrical properties of the films are explored.We found that the films prepared at a sputtering power of 80 W,an Ar/O2 flow ratio of 1 6:4 and a deposition time of 20 min showed the best overall performance.Lithium titanate(LixTiyOz)is chosen as the source of Li+."LTO/TaOx" ionic conductive storage-transmission composite structures are proposed and designed.The optical properties of the "LTO/TaOx" ionic conductive storage-transmission composite structures are tested and analyzed,the optical parameters of the composite structures are calculated,and the refractive index dispersion curves of the films are obtained according to the linear extrapolation and fitting results.Besides,inorganic all-solidstate complementary ECDs based on "LTO/TaOx" ionic conductive storage-transmission composite structures are successfully prepared,the optical modulation amplitude,switching response time,optical storage capacity and cycle life of"ITO/NiOx/LTO/TaOx/WOx/ITO" ECDs are tested and analyzed.The test results show that the structural device has 57.96%optical modulation,13 s/14 s coloring,bleaching response time and stable cycle life.I-ECDs are placed in the natural environment for one year,the aging test of I-ECDs are carried out,and the electrochromic mechanism and kinetic model of I-ECD are analyzed.LPO thin films are prepared by reactive magnetron sputtering.The effects of sputtering power,deposition time,and reaction atmosphere on the phase structure,overall morphology and optical properties of the films are explored.The test results show that the LPO film prepared at the sputtering power of 80W,the pure argon atmosphere and the deposition time of 180min have better overall performance.Finally,the ?-ECDs based on“LTO/TaOx”ionic conductive storage-transmission composite structures are prepared and the ECD has 61.25%optical modulation,10 s/11 s coloring,bleaching response time and stable cycle life.