Exciton physics of halide perovskite nanocrystals
Yoshihiko Kanemitsu a
a Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Invited Speaker, Yoshihiko Kanemitsu, presentation 051
DOI: https://doi.org/10.29363/nanoge.iperop.2019.051
Publication date: 23rd October 2018

Recently, metal halide perovskite semiconductors are being intensively studied with respect to both fundamental physics and implementation in solution-processed functional devices. While solution-grown bulk single crystals have been employed to reveal the intrinsic optical properties of perovskites [1-4], colloidal synthesis promises further technological advances since this enables preparation of novel perovskite nanocrystals, combining excellent optoelectronic properties with quantum confinement effects. The highly efficient luminescence of the perovskite nanocrystals has a narrow bandwidth and its wavelength can be tuned over the entire visible spectrum. These properties make them particular interesting for display phosphors, light-emitting diodes, lasers, and single photon sources. The successful design of such new optoelectronic devices depends on the detailed knowledge about excitons and excitonic complexes in the nanocrystals. Here, we report on the optical responses of organic-inorganic hybrid and all-inorganic perovskite nanocrystals. Their luminescence quantum yields and the lifetimes of excitons, charged excitons, and biexcitons [5-7] were evaluated by employing femtosecond transient-absorption and single-dot spectroscopy [8-10]. It is shown that both nonradiative Auger ionization and charged surface defects can contribute to the charged exciton generation in perovskite nanocrystals. We discuss the photophysics of the charged excitons, because they determine the device performance of nanocrystal-based light emitters.

The author would like to thank many colleagues for their contributions and discussions. Part of this work was supported by JST-CREST (Grant No. JPMJCR16N3).

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