TY - CONF T1 - Structural and Optical Properties of Sol-Gel Deposited Proton Conducting Ta2O5 Films T2 - 8th International Workshop on Glasses and Ceramics From Gels Y1 - 1995/09// A1 - Nilgün Özer A1 - Carl M Lampert KW - electrochromic devices KW - optical proterties KW - proton conductor KW - tantalum oxide AB - Proton conducting tantalum oxide films were deposited by spin coating using a sol-gel process. The coating solutions were prepared using Ta(OC2H5)5 as a precursor. X-ray diffraction studies determined that the sol-gel films, heat treated at temperatures below 400 °C, were amorphous. Films heat treated at higher temperatures were crystalline Ta2O5. The solar transmission values (Ts) of tantala films on glass generally range from 0.8-0.9 depending on thickness. The refractive index and the extinction coefficient were evaluated from transmittance characteristics in the UV-VIS-NIR regions. The refractive index values calculated at λ=550 nm increased from n=1.78 to 1.97 with increasing heat treatment from 150 to 450 °C. The films heat treated at different temperatures showed low absorption with extinction coefficients of less than k=1 x 10-3 in the visible range. Spectrophotometric and impedance spectroscopic investigations performed on Ta2O5 films revealed that these films have protonic conductivity of 3.2 x 10-6 S/cm. The films are suitable for proton conducting layers in electrochromic (EC) devices. JF - 8th International Workshop on Glasses and Ceramics From Gels CY - Faro, Portugal U1 -

Windows and Daylighting Group

U2 - LBL-37800 ER -