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Pulsed Terahertz Emission from Solution-Processed Lead Iodide Perovskite Films
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Ctr Phys Sci and Technol, Lithuania.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: ACS Photonics, E-ISSN 2330-4022, Vol. 6, no 5, p. 1175-1181Article in journal (Refereed) Published
Abstract [en]

We report pulsed terahertz (THz) emission from solution-processed metal halide perovskite films with electric field 1 order of magnitude lower than p-InAs, an efficient THz emitter. Such emission is enabled by a unique combination of efficient charge separation, high carrier mobilities, and more importantly surface defects. The mechanism of generation was identified by investigating the dependence of the THz electric field amplitude on surface defect densities, excess charge carriers, excitation intensity and energy, temperature, and external electric field. We also show for the first time THz emission from a curved surface, which is not possible for any crystalline semiconductor and paves the way to focus high-intensity sources. These results represent a possible new direction for perovskite optoelectronics and for THz emission spectroscopy as a complementary tool in investigating surface defects on metal halide perovskites, of fundamental importance in the optimization of solar cells and light-emitting diodes.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 6, no 5, p. 1175-1181
Keywords [en]
terahertz; metal halide perovskite; THz emission spectroscopy; polycrystalline thin films; surface defects
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-158355DOI: 10.1021/acsphotonics.8b01693ISI: 000468367600014OAI: oai:DiVA.org:liu-158355DiVA, id: diva2:1333838
Note

Funding Agencies|ERC Starting Grant [717026]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkping University (Faculty Grant SFO-Mat-LiU) [2009-00971]; European Union Marie Curie ITN Project NOTEDEV [607521]; China Scholarship Council; Knut and Alice Wallenberg Foundation (KAW); Swedish Foundation for Strategic Research (SSF) [RIF14-055]

Available from: 2019-07-02 Created: 2019-07-02 Last updated: 2019-07-02

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