TY - CPAPER KW - Tio2 KW - Optical constants KW - Band gap KW - Charge capacity KW - Electrochromic cerium titanium oxide KW - Grain size KW - Rms roughness AU - Klaus von Rottkay AU - Thomas J Richardson AU - Michael D Rubin AU - Jonathan L Slack AU - Lisen Kullman AB -

CeO2-TiO2 finds use as passive counter-electrode in electrochromic devices. Thin films were produced by dc-sputtering in a wide range of compositions. Influence of total pressure and oxygen partial pressure on the optical constants of TiO2 was investigated. Slightly substoichiometric TiO2 films exhibit a red-shift of the bandgap. The TiO2 content in the compound essentially determines the degree of cathodical coloring upon Li+ intercalation. However, pure TiO2 films with comparable visible transmittance in the clear state behave differently during electrochemical cycling depending on oxygen stoichiometry. Films that are deposited at higher total pressure are more oxygen rich and require initial formatting until current voltage cycles become stable. CeO2-TiO2 films of intermediate compositions have the relatively highest charge capacity. Comparison with atomic force microscopy indicates a correlation of small grain size with high charge capacity.

BT - 11th International Conference of Solid State Ionics C1 -

Windows and Daylighting Group

C2 - LBNL-41550 CN - LBNL-41550 CY - Honolulu, Hawaii DA - 11/1997 LA - eng N2 -

CeO2-TiO2 finds use as passive counter-electrode in electrochromic devices. Thin films were produced by dc-sputtering in a wide range of compositions. Influence of total pressure and oxygen partial pressure on the optical constants of TiO2 was investigated. Slightly substoichiometric TiO2 films exhibit a red-shift of the bandgap. The TiO2 content in the compound essentially determines the degree of cathodical coloring upon Li+ intercalation. However, pure TiO2 films with comparable visible transmittance in the clear state behave differently during electrochemical cycling depending on oxygen stoichiometry. Films that are deposited at higher total pressure are more oxygen rich and require initial formatting until current voltage cycles become stable. CeO2-TiO2 films of intermediate compositions have the relatively highest charge capacity. Comparison with atomic force microscopy indicates a correlation of small grain size with high charge capacity.

PP - Honolulu, Hawaii PY - 1997 T2 - 11th International Conference of Solid State Ionics T3 - 11th International Conference of Solid State Ionics TI - Influence of stoichiometry on the electrochromic cerium-titanium oxide compounds ER -