Physical phenomena behind photodoping in doped metal oxide nanocrystals

Ilka Kriegel

doi:10.1117/12.2625984

30 May 2022 Physical phenomena behind photodoping in doped metal oxide nanocrystals

Ilka Kriegel

Proceedings Volume PC12142, Fiber Lasers and Glass Photonics: Materials through Applications III; PC1214201 (2022) https://doi.org/10.1117/12.2625984
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Doped metal oxide nanocrystals (MO NCs), such as Sn doped In2O3 (ITO) or doped zinc oxide (ZnO) and cadmium oxide (CdO) display localized surface plasmon resonances due to their carrier density around 10^21 cm^-3. Such optical properties are tunable across the near infrared spectral range upon doping control. The dynamic modulation becomes possible through the pseudo-capacitive charge injection by applying an electrochemical potential or through the interaction with light beyond their bandgap, i.e. photodoping. The latter allows accumulation of multiple electrons within one NC through the absorption of several photons, as the holes react with sacrificial hole scavengers. Capacitance values comparable to commercially available supercapacitor materials are extracted. In this presentation, I will discuss the fundamental physical and chemical processes underlying photodoping of MO NCs. I will further discuss the possibility of multi-charge transfer processes following photodopin and highlight open questions with regards to their implementation as novel light-driven multi-charge accumulation components in the next generation of solar energy devices.

Conference Presentation

Citation Download Citation

Ilka Kriegel "Physical phenomena behind photodoping in doped metal oxide nanocrystals", Proc. SPIE PC12142, Fiber Lasers and Glass Photonics: Materials through Applications III, PC1214201 (30 May 2022); https://doi.org/10.1117/12.2625984

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