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
投稿时间:2018-01-11  修订日期:2018-04-27  点此下载全文
引用本文: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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作者单位E-mail
张波 首都师范大学 bzhang@cnu.edu.cn 
吕龙锋 北京交通大学  
沈京玲 首都师范大学  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要: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.
中文关键词:关 键 词:太赫兹  有机卤化物钙钛矿  超快调制
 
Ultrafast terahertz modulation characteristics of organolead halide perovskite films revealed by time-resolved terahertz spectroscopy
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.
keywords:Terahertz, organolead  halide perovskite,ultrafast  modulation
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