Dynamic Optical Properties of CH(3)NH(3)Pbl(3) Single Crystals As Revealed by One- and Two-Photon Excited Photoluminescence Measurements

作者：Yamada, Yasuhiro; Yamada, Takumi; Le Quang Phuong; Maruyama, Naoki; Nishimura, Hidetaka; Wakamiya, Atsushi; Murata, Yasujiro; Kanemitsu, Yoshihiko^*

来源：Journal of the American Chemical Society, 2015, 137(33): 10456-10459.

DOI：10.1021/jacs.5b04503

• SOLAR-CELLS
• PEROVSKITE CH3NH3PBI3
• 2ND-HARMONIC GENERATION
• EFFICIENCY
• LENGTHS
• RECOMBINATION
• MOBILITIES
• TRANSPORT

The dynamic optical properties of perovskite CH(3)NH(3)Pbl(3) 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.

• 出版日期2015-8-26