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• Matsushita, S
• Hayashi, M
• Isobe, T
• Nakajima, A
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• Hayashi, M
• Isobe, T
• Nakajima, A
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• Hayashi, M
• Isobe, T
• Nakajima, A

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Crystals 2012, 2(4), 1483-1491; doi:10.3390/cryst2041483

Communication

Simulation Design for Rutile-TiO₂ Nanostructures with a Large Complete-Photonic Bandgap in Electrolytes

Sachiko Matsushita* , Mikiro Hayashi, Toshihiro Isobe and Akira Nakajima

Department of Metallurgy & Ceramics Science, Graduate School of Science & Technology, Tokyo Institute of Technology 2-12-1-S7-8, Ookayama, Meguro-ku, Tokyo 152-8552, Japan

* Author to whom correspondence should be addressed.

Received: 4 April 2012; in revised form: 9 October 2012 / Accepted: 10 October 2012 / Published: 26 October 2012

(This article belongs to the Special Issue Current Trends in Application of Photonic Crystals)

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Abstract: The photonic bands of various TiO₂ 2D photonic crystals, i.e., cylindrical, square and hexagonal columns connected with/without walls and filled with acetonitrile, were investigated from the perspective of dye-sensitized solar cells. The finite-difference time-domain methods revealed that two-dimensional (2D) photonic crystals with rods connected with walls composed of TiO₂ and electrolytes had complete photonic band gaps under specific conditions. This optimally designed bandgap reaches a large Δω/ω_mid value, 1.9%, in a triangular array of square rods connected with walls, which is the largest complete 2D bandgap thus far reported for a photochemical system. These discoveries would promote the photochemical applications of photonic crystals.

Keywords: photonic band diagram; photonic band gap; photocatalyst; dye-sensitized solar cell; electrochemical reaction

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