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Solution‐Processed Lead Iodide for Ultrafast All‐Optical Switching of Terahertz Photonic Devices
Author(s) -
Manjappa Manukumara,
Solanki Ankur,
Kumar Abhishek,
Sum Tze Chien,
Singh Ranjan
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201901455
Subject(s) - materials science , terahertz radiation , ultrashort pulse , photonics , optoelectronics , lead (geology) , iodide , optical switch , nanotechnology , optics , laser , inorganic chemistry , physics , chemistry , geomorphology , geology
Solution‐processed lead iodide (PbI 2 ) governs the charge transport characteristics in the hybrid metal halide perovskites. Besides being a precursor in enhancing the performance of perovskite solar cells, PbI 2 alone offers remarkable optical and ultrasensitive photoresponsive properties that remain largely unexplored. Here, the photophysics and the ultrafast carrier dynamics of the solution processed PbI 2 thin film is probed experimentally. A PbI 2 integrated metamaterial photonic device with switchable picosecond time response at extremely low photoexcitation fluences is demonstrated. Further, findings show strongly confined terahertz field induced tailoring of sensitivity and switching time of the metamaterial resonances for different thicknesses of PbI 2 thin film. The approach has two far reaching consequences: the first lead‐iodide‐based ultrafast photonic device and resonantly confined electromagnetic field tailored transient nonequilibrium dynamics of PbI 2 which could also be applied to a broad range of semiconductors for designing on‐chip, ultrafast, all‐optical switchable photonic devices.