TY - JOUR
T1 - Construction and characterization of tunable meso-/macroporous tungsten oxide-based transmissive electrochromic devices
AU - Balaji, Subramanian
AU - Djaoued, Yahia
AU - Albert, André-Sébastien
AU - Ferguson, Richard Z.
AU - Brüning, Ralf
AU - Su, Bao-Lian
PY - 2009
Y1 - 2009
N2 - Recent developments in the processing of porous transition metal oxide thin films have opened up new opportunities in the construction of electrochromic (EC) devices with enhanced properties. Tungsten oxide (WO3) is one of the most promising materials for EC devices. In this work, we report on the synthesis of meso-/macroporous WO3 thin films using tungstic acid as precursor and organically modified silane (ORMOSIL) as a templating agent. Calcination of the film at 500 °C resulted in nanocrystalline monoclinic tungsten oxide (m-WO3) with crystallite sizes of ~16 nm. The meso-/macroporous structure is retained after calcination. An asymmetric EC device based on the meso-/macroporous m-WO3 thin film was constructed. Thus constructed EC device was characterized by micro-Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction (XRD). Detailed micro-Raman and XRD studies of the intercalation and deintercalation of lithium (Li) in the meso-/macroporous m-WO3 layer of the EC device as a function of the applied voltage were performed. The meso-/macroporous WO3 layer, which was found to be monoclinic before Li intercalation, transforms to its higher symmetric phase of tetragonal and toward cubic phase when Li is intercalated into it. Upon complete deintercalation, these phase transitions were reversed and m-WO3 is recovered. Optical transmission studies were performed in conjunction with Raman and XRD studies. This study shows that meso-/macroporous m-WO3 layer-based EC device exhibit a high color contrast during the coloration and bleaching.
AB - Recent developments in the processing of porous transition metal oxide thin films have opened up new opportunities in the construction of electrochromic (EC) devices with enhanced properties. Tungsten oxide (WO3) is one of the most promising materials for EC devices. In this work, we report on the synthesis of meso-/macroporous WO3 thin films using tungstic acid as precursor and organically modified silane (ORMOSIL) as a templating agent. Calcination of the film at 500 °C resulted in nanocrystalline monoclinic tungsten oxide (m-WO3) with crystallite sizes of ~16 nm. The meso-/macroporous structure is retained after calcination. An asymmetric EC device based on the meso-/macroporous m-WO3 thin film was constructed. Thus constructed EC device was characterized by micro-Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction (XRD). Detailed micro-Raman and XRD studies of the intercalation and deintercalation of lithium (Li) in the meso-/macroporous m-WO3 layer of the EC device as a function of the applied voltage were performed. The meso-/macroporous WO3 layer, which was found to be monoclinic before Li intercalation, transforms to its higher symmetric phase of tetragonal and toward cubic phase when Li is intercalated into it. Upon complete deintercalation, these phase transitions were reversed and m-WO3 is recovered. Optical transmission studies were performed in conjunction with Raman and XRD studies. This study shows that meso-/macroporous m-WO3 layer-based EC device exhibit a high color contrast during the coloration and bleaching.
U2 - 10.1007/s10853-009-3575-8
DO - 10.1007/s10853-009-3575-8
M3 - Article
SN - 0022-2461
VL - 44
SP - 6608
EP - 6616
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 24
ER -