Study of the optical band gap of lithium tungsten trioxide thin films

摘要

The insertion of lithium (lithiation) into tungsten trioxide results in the formation of the tungsten bronze Li(sub x)WO(sub 3). Polycrystalline, rf sputter deposited thin films of Li(sub x)WO(sub 3) were investigated for their application in Smart Window Devices. The optical band gap studies of these films revealed the narrowing of the intrinsic band gap as a consequence of lithium insertion. The results suggest that the rigid band model, which is generally adopted in interpreting the electronic structure of the tungsten bronzes may not be applicable in Li(sub x)WO(sub 3). 14 refs., 2 tabs.