Dynamic Optical Properties of CH 3 NH 3 PbI 3 Single Crystals As Revealed by One- and Two-Photon Excited Photoluminescence Measurements
2015; American Chemical Society; Volume: 137; Issue: 33 Linguagem: Inglês
10.1021/jacs.5b04503
ISSN1943-2984
AutoresYasuhiro Yamada, Takumi Yamada, Le Quang Phuong, Naoki Maruyama, Hidetaka Nishimura, Atsushi Wakamiya, Yasujiro Murata, Yoshihiko Kanemitsu,
Tópico(s)Chalcogenide Semiconductor Thin Films
ResumoThe dynamic optical properties of perovskite CH3NH3PbI3 single crystals were studied by means of time-resolved photoluminescence (PL) spectroscopy at room temperature. The PL peak under one-photon excitation exhibits a red-shift with elapsing time, while two-photon PL is time-independent and appears at lower energy levels. The low-energy two-photon PL can be attributed to emissions from the localized states because of strong band-to-band absorption and photon re-absorption of the emitted light in the interior region. We revealed that the PL behaviors can be explained by the diffusion of photocarriers generated in the near-surface region to the interior region. The excitation fluence dependence of the one-photon PL dynamics is also discussed in terms of the electron-hole radiative recombination and carrier diffusion effects.
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