Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 36: Poster Session I
DS 36.28: Poster
Donnerstag, 19. März 2015, 09:30–12:00, Poster A
Electrochemical analysis of LiPON-tungstenoxide thin-film-systems — •Christopher James, Yurong Su, Angelika Polity, and Bruno K. Meyer — 1. physikalisches Institut der Justus Liebig Universität, Gießen, Deutschland
Amorphous glassy solid state electrolyte LiPON (lithiumphosphorousoxynitride) thin films were sputtered on amorphous electrochromic tungstenoxide (WOx) in order to investigate the electrochromic properties of tungstenoxide under the presence of a solid state electrolyte. The LiPON films were deposited by sputtering. Before deposition of LiPON, the WOx films were either deintercalated (transparent) or intercalated (darkblue). Since during the sputterprocess colouration could not be prevented at any time, sputter parameters were found for homogeneous colouration of the WOx. Cyclic voltammetry (CV) was then applied to LiPON/WOx- and to raw WOx-samples in order to investigate the colouration efficiency of WOx with and without LiPON. CV results revealed a significant degradation of included charge densities being incorporated during cycling, which means colouration changes of the tungstenoxide could hardly be enhanced with CV. With CV, only slight bleaching of the pre-coloured WOx layer was achieved. It can be suggested, that Li ion sites in the electrochromic film became occupied by pre-colouration, so during sputter process these sites could no more be irreversibly intercalated. EIS (electrochemical impedance spectroscopy) results revealed an ionic conductivity of the LiPON films of the order of µS cm−1.