| 研究実績の概要 |
In fiscal year 2017, we have completed the set target to optimize the defects in oxides and examine the wavelength conversion and demonstration of a “plasmon-mediated photoelectric transfer”. With suitable combinations of plasmonic metal (TiN/Au) and oxides/nitrides (GeO2/C3N4), we demonstrated the near IR light induced photocurrent generation and photocatalytic chemical reactions for water splitting. On plasmonic nano-antenna (TiN/Au nano pillars fabricated by colloidal lithography), we deposited Ge (sputter deposition) and annealed in oxygen deficient condition to optimize the defects. The defects are studied by XPS and Raman spectroscopy. The optimized GeO2/Ge/TiN/Si structure examine for the wavelength conversion and photoluminescence enhancement. The defect-mediated broad-band NIR upconversion is still under investigations. We have also successfully demonstrated the NIR light induced sub-band gap photocurrent generation in TiN/Ge and TiN-C3N4-C dots composite for UV-VIS-NIR responsive photocatalytic chemical reactions. The work on optimization of defects in GeO2/Ge pyramids structure, NIR light induced photocurrent generation and TiN/carbon nitride composite have been presented in various conferences/meetings (S. L. Shinde et. al. IUMRS-ICAM, Aug. 2017; ISSS-8, Oct. 2017; MANA International Symposium, March 2018) and published in peer reviewed journals (S. L. Shinde et. al. ACS Photonics 2017 (4), 1722, ACS applied materials & interfaces 2018 (10), 2460).
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