(Invited) Fabrication of Ordered Semiconductor Nanostructures for Energy Conversion Based on Anodization Processes

• Published in: Meeting abstracts (Electrochemical Society) Vol. MA2018-01; no. 11; p. 948
• Main Authors: Masuda, Hideki, Kondo, Toshiaki, Yanagishita, Takashi
• Format: Journal Article
• Language: English
• Published: 13.04.2018
• ISSN: 2151-2043; 2151-2035
• DOI: 10.1149/MA2018-01/11/948

High throughput fabrication of ordered nanostructures of semiconductors is an important subject for the preparation of the photo-energy devices with high conversion efficiencies 1 . Anodization process of metal is a promising candidate for the efficient fabrication of nanostructured semiconductors with controlled geometrical structures 2 . Anodic porous alumina, which is formed by anodization of Al in acidic solution, is a typical self-ordered material. The use of the anodic porous alumina as a starting structure allows the efficient preparation of the semiconductors with controlled geometrical structures, such as nanorods or nanodots arrays 3 . The anodization processes of appropriate metals can also generates the semiconductors with controlled geometrical structures. For example, the anodization of Ti in the electrolyte containing F - generates the porous TiO 2 with controlled nanostructures 4 . In the present report, recent results concerning the fabrication processes for the semiconductors with ordered geometrical nanostructures for the photo-energy conversion will be described. The processes include the preparation of semiconductor nanorod arrays from anodic porous alumina templates and its application to organic photovoltaic solar cells. In addition, anodization process using pretextured Ti for the TiO 2 with ideally ordered hole arrangement will be shown 5 . This process can be also applied to the fabrication of porous TiO 2 with modified hole shapes 6 . The results of the efficient fabrication of ordered TiO 2 will be also described. The obtained semiconductor nanostructures will be applied to various types of photo-energy conversion devices with high efficiency originated from precisely controlled geometrical structures. W. U. Huynh, J. J. Dittmer, A. P. Alivisatos, Science, 295 , 2425 (2002). Masuda and K. Fukuda, Science, 268 , 1466 (1995). Masuda, T. Kondo, T. Yanagishita, 231 st ECS Meeting, 834 (2017). Roy, S. Berger, P. Scmuki, Angew. Chem. Int. Ed. 50 , 2904 (2011). Kondo, S. Nagao, T. Yanagishita, N. T. Nguyen, K. Lee, P. Schmuki, H. Masuda, Electrochem. Commun., 50 , 73 (2015). Kondo, S. Nagao, T. Yanagishita, H. Masuda, J. Electrochem. Soc., 163 , E206 (2016).