太赫兹时间分辨系统研究有机卤化物钙钛矿薄膜的超快太赫兹调制
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首都师范大学,北京交通大学,首都师范大学

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Ultrafast terahertz modulation characteristics of organolead halide perovskite films revealed by time-resolved terahertz spectroscopy
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Capital Normal University,Beijing Jiaotong University,Capital Normal University

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    摘要:

    研究了利用太赫兹时间分辨系统研究有机卤化物钙钛矿薄膜 (CH3NH3PbI3 and CH3NH3PbI3-xClx) 的皮秒尺度的超快太赫兹调制特性.在光激发作用下出现了太赫兹透射波的瞬时下降.相比于CH3NH3PbI3薄膜, 在光激发作用下CH3NH3PbI3-xClx薄膜展现了更高的调制深度 (10%) .通过测算材料的电导率及载流子浓度, 其调制机理为瞬态光激发载流子浓度上升.实验结果表明, CH3NH3PbI3-xClx薄膜可作为一种高效超快太赫兹调制器件.

    Abstract:

    Ultrafast terahertz ( THz) modulation characteristics of organolead halide perovskite films ( CH3 NH3 Pb I3 and CH3 NH3 Pb I3-xClx) were investigated on picosecond time scales using time-resolved THz spectroscopy. Upon photo-excitation, a transient decrease in THz transmission was observed. Compared with CH3NH3PbI3, CH3NH3PbI3-xClx showed a better modulation depth ( 10%) within the range of the photo-excitation powers used.The mechanism underpinning this photoconductive ultrafast response was determined by measuring the transmission properties and calculating the carrier density. The larger crystalline bulk of the CH3NH3PbI3-xClx film produced higher carrier densities than the CH3NH3PbI3 film. These results demonstrate that CH3NH3PbI3-xClx films are promising materials for developing high-performance THz modulators and ultrafast switchable THz photoelectric devices.

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张波,吕龙锋,沈京玲.太赫兹时间分辨系统研究有机卤化物钙钛矿薄膜的超快太赫兹调制[J].红外与毫米波学报,2018,37(5):523~526]. ZHANG Bo, LYU Long-Feng, SHEN Jing-Ling. Ultrafast terahertz modulation characteristics of organolead halide perovskite films revealed by time-resolved terahertz spectroscopy[J]. J. Infrared Millim. Waves,2018,37(5):523~526.]

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  • 收稿日期:2018-01-11
  • 最后修改日期:2018-04-27
  • 录用日期:2018-05-02
  • 在线发布日期: 2018-10-31
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