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Controlling Optical Properties of Multinary Quantum Dots for Developing Novel Photoelectrochemical Reactions

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Photosynergetic Responses in Molecules and Molecular Aggregates

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Abstract

We introduce solution-phase preparation of multinary QDs composed of less-toxic Ag-III-VI-based semiconductors and control of their physicochemical properties. The energy gaps (Egs) of multinary QDs could be adjusted by the chemical composition as well as by the particle size. The photochemical properties, including photoluminescence (PL), photocatalysis, and photocurrent generation, of prepared QDs, are discussed in terms of the Eg, the non-stoichiometric chemical composition, and the particle morphology. The PL peak was controlled from visible to near-IR wavelength regions by varying the chemical composition of QDs, in which the peak width of Ag-In-Ga-S QDs was remarkably narrowed by the removal of deep defect levels via tuning of non-stoichiometry and the surface condition. A nonlinear photoresponse induced by hot hole transfer was observed by visible light irradiation to near-IR-light-responsive Zn-Ag-In-Te QDs. The findings will provide new insights into design and fabrication of novel QD-based devices.

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Acknowledgements

The present work was supported by JSPS KAKENHI Grant Numbers JP15H01082 and JP17H05254 in Scientific Research on Innovative Areas “Photosynergetics” and JP16H06507 in Scientific Research on Innovative Areas “Nano-Material Optical-Manipulation.”

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Authors and Affiliations

  1. Department of Materials Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-Ku, Nagoya, 464-8603, Japan

    Tsukasa Torimoto & Tatsuya Kameyama

Authors
  1. Tsukasa Torimoto
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  2. Tatsuya Kameyama
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Correspondence to Tsukasa Torimoto .

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Editors and Affiliations

  1. Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan

    Hiroshi Miyasaka

  2. Graduate School of Engineering, Kyoto University, Kyoto, Japan

    Kenji Matsuda

  3. Department of Chemistry, Aoyama Gakuin University, Sagamihara, Kanagawa, Japan

    Jiro Abe

  4. Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara, Japan

    Tsuyoshi Kawai

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Torimoto, T., Kameyama, T. (2020). Controlling Optical Properties of Multinary Quantum Dots for Developing Novel Photoelectrochemical Reactions. In: Miyasaka, H., Matsuda, K., Abe, J., Kawai, T. (eds) Photosynergetic Responses in Molecules and Molecular Aggregates. Springer, Singapore. https://doi.org/10.1007/978-981-15-5451-3_13

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