Synthesis of mesoporous ITO/TiO2 electrodes for optoelectronics
By Enrico Binetti and Zakaria El Koura and Nicola Bazzanella and Gianfranco Carotenuto and Antonio Miotello
Published in Materials Letters
NULL
2015
Abstract
Several optoelectronic applications require transparent and conductive films, usually deposited by RF-magnetron sputtering, interfaced with a TiO2 compact or mesoporous layer, deposited in subsequent processes. Here we report on the direct fabrication by RF-magnetron sputtering of mesoporous ITO/TiO2 heterojunctions, exhibiting enhanced charge-transfer properties. The mesoporous morphology was obtained by tuning the sputtering deposition parameters. Scanning Electron Microscopy provided a deeper insight into the electrode building, which resulted composed by a compact \ITO\ layer, tapered with columnar \ITO\ nanocrystals, completely covered with jagged anatase TiO2 cauliflower-like structures. Such mesoporous electrodes exhibited enhanced electrochemical performances, compared to those of compact thin-film heterojunctions, due to the enhanced charge transfer at the ITO/TiO2 interface.
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