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Accessible Unlicensed Requires Authentication Published by De Gruyter September 22, 2016

Rapid expansion of TiO2 layers processed by supercritical solutions for dye sensitized solar cell applications

Schnelle Ausdehnung einer TiO2-Schicht, hergestellt mittels superkritischer Lösungen (RESS), für farbsensitive Solarzellen
Mustafa Tuncer, Hasan Göçmez and Seher Çetin
From the journal Materials Testing

Abstract

In this work, anatase-type TiO2 layers were prepared by deposition of precursor solution including titanium isopropoxide, ethanol and acetic acetylacetone on a FTO substrate using rapid expansion of supercritical solutions (RESS). The spraying to obtain a particulate coating of TiO2 was carried out at 65 °C and 180 bar of supercritical carbon dioxide environment. Then, thermal annealing at 550 °C for 2 h was applied to coated substrates to obtain desired phase composition. The structural and optical properties of the film were evaluated by XRD, SEM and UV-Vis. SEM observation showed that the photoanode film has porous microstructure with interconnected spherical TiO2 grains. TiO2 film has a band gap of 2.6 eV.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Forschungsarbeit wurde eine Anatas-artige TiO2-Schicht hergestellt, indem eine Precursor-Lösung aus Titan-Isopropoxid, Ethanol und essigsaurem Acetylaceton auf einem FTO-Substrat aufgebracht wurde, wobei die schnelle Ausdehnung superkritischer Lösungen (RESS) angewandt wurde. Der Spritzprozess, um die partikuläre TiO2-Schicht herzustellen, wurde bei 65 °C und 180 bar in einer superkritischen Kohlendioxid-Umgebung durchgeführt. Danach wurden die beschichteten Substrate bei 550 °C über 2 h geglüht, um die gewünschte Phasenkombination zu erhalten. Die strukturellen und optischen Eigenschaften der Schichten wurden mittels XRD, REM und UV-VIS analysiert. Während der REM-Untersuchung stellte sich heraus, dass der photoanodische Film eine poröse Mikrostruktur mit ineinander verbundenen kugeligen TiO2-Körnern hat. Der TiO2-Film hat einen Bandabstand von 2.6 eV.


*Correspondence Address, Prof. Hasan Göçmez, Dumlupinar University, Materials Science & Engineering Department, 43100 Kutahya, Turkey, E-mail:

Assoc. Prof. Dr. Mustafa Tuncer, born in 1978, received the BSc degree from the Department of Ceramic Engineering of the University of Dumlupinar in Kutahya, Turkey, in 2000, and his MSc and PhD degrees in Ceramic Engineering from the same university in 2003 and 2011, respectively. He has experience in ceramic processing, powder synthesis and photovoltaic materials. He is Associate Professor in the Department of Materials Science and Engineering at Dumlupinar University, Kutahya, Turkey.

Prof. Dr. Hasan Göçmez, born in 1971, received his BSc degree from the Department of Metallurgical Engineering of the University of Middle East Technical, Ankara, Turkey, in 1977, and his MSc and PhD degrees in Material/Ceramic Engineering from the Rutgers University, New Brunswick, New Jersey, USA, in 1997 and 2001, respectively. He has experience in ceramic processing, nanomaterials and photovoltaic materials. He is Professor in the Department of Materials Science and Engineering at Dumlupinar University in Kutahya, Turkey.

Seher Çetin, born in 1986, received his BSc degree from the Department of Ceramic Engineering of the University of Dumlupinar, Kutahya, Turkey, in 2010, and his MSc degree in Ceramic Engineering from the same university in 2013. He has experience in ceramic processing, coating process and photovoltaic materials. He is project assistant in the Department of Material Science and Engineering at Dumlupinar University, Kutahya, Turkey.


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Published Online: 2016-09-22
Published in Print: 2016-10-04

© 2016, Carl Hanser Verlag, München