Dynamic Optical Properties of CH3NH3PbI3 Single Crystals As Revealed by One- and Two-Photon Excited Photoluminescence Measurements

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• 作者：Yasuhiro Yamada ; Takumi Yamada ; Le Quang Phuong ; Naoki Maruyama ; Hidetaka Nishimura ; Atsushi Wakamiya ; Yasujiro Murata ; Yoshihiko Kanemitsu
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：August 26, 2015
• 年：2015
• 卷：137
• 期：33
• 页码：10456-10459
• 全文大小：329K
• ISSN：1520-5126

文摘

The 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鈥揾ole radiative recombination and carrier diffusion effects.