Terahertz Emission via Optical Rectification in a Metal-Free Perovskite Crystal.
| Autor: | Gallop NP; Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., Sirbu D; School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K., Walker D; Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., Lloyd-Hughes J; Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., Docampo P; School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne NE1 7RU, U.K.; School of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K., Milot RL; Department of Physics, University of Warwick, Coventry CV4 7AL, U.K. |
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| Jazyk: | angličtina |
| Zdroj: | ACS photonics [ACS Photonics] 2023 Oct 18; Vol. 10 (11), pp. 4022-4030. Date of Electronic Publication: 2023 Oct 18 (Print Publication: 2023). |
| DOI: | 10.1021/acsphotonics.3c00918 |
| Abstrakt: | We report on the emission of high-intensity pulsed terahertz radiation from the metal-free halide perovskite single crystal methyl-DABCO ammonium iodide (MDNI) under femtosecond illumination. The power and angular dependence of the THz output implicate optical rectification of the 800 nm pump as the mechanism of THz generation. Further characterization finds that, for certain crystal orientations, the angular dependence of THz emission is modulated by phonon resonances attributable to the motion of the methyl-DABCO moiety. At maximum, the THz emission spectrum of MDNI is free from significant phonon resonances, resulting in THz pulses with a temporal width of <900 fs and a peak-to-peak electric field strength of approximately 0.8 kV cm -1 -2 orders of magnitude higher than any other reported halide perovskite emitters. Our results point toward metal-free perovskites as a promising new class of THz emitters that brings to bear many of the advantages enjoyed by other halide perovskite materials. In particular, the broad tunability of optoelectronic properties and ease of fabrication of perovskite materials opens up the possibility of further optimizing the THz emission properties within this material class. Competing Interests: The authors declare no competing financial interest. (© 2023 The Authors. Published by American Chemical Society.) |
| Databáze: | MEDLINE |
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