Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
DOI: https://doi.org/10.29363/nanoge.iperop.2023.035
Publication date: 21st November 2022
Recently, halide perovskites, a new class of functional materials different from conventional inorganic semiconductors, debuted in the research field of condensed matter physics. Halide perovskites show sharp optical absorption edge and efficient photoluminescence (PL) with no essential Stokes shift even at room temperature. Thus, photocarrier and exciton dynamics can be studied using PL spectroscopy. Two-photon excitation PL spectroscopy clarifies that the photon reabsorption and photon recycle processes occur in halide perovskites [1]. After the first observation [1], by considering photon reabsorption, we successfully explain “anomalous” PL properties of thick samples such as the thickness dependence of the PL spectrum, two peak PL structures at the near band-edge, and the impurity concentration dependence of the PL spectrum [2,3]. Nonlinear optical spectroscopy including two-photon excitation PL measurements is a powerful tool to clarify intrinsic optical processes in halide perovskites. In this talk, we discuss the electronic structures and photocarrier dynamics of halide perovskites revealed by nonlinear optical spectroscopy [4-9].
Part of this work was supported by JSPS KAKENHI (Grant No. JP19H05465) and JST CREST (Grant No. JPMJCR21B4).
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