Stable Room-Temperature Amplified Spontaneous Emission from Single-Source Thermally Evaporated Cesium Lead Halide Perovskites

Yuliia Kominko^a^,^b, Sebastian Sabisch^a^,^b, Andrii Kanak^a^,^b, Gabriele Raino^a^,^b, Simon C. Böhme^a^,^b, Gebhard J. Matt^a^,^b, Lidiia Dubenska^a, Ihor Cherniuk^a^,^b, Frank Krumeich^a, Matthias Klimpel^a^,^b, Xuqi Liu^a, Sergey Tsarev^a^,^b, Sergii Yakunin^a^,^b, Maksym V. Kovalenko^a^,^b

^aDepartment of Chemistry and Applied Biosciences, ETH Zürich, Zürich, Switzerland

^bLaboratory for Thin Films and Photovoltaics, Empa – Swiss Federal Laboratories For Materials Science and Technology, Switzerland

Proceedings of Emerging Light Emitting Materials 2024 (EMLEM24)

La Canea, Greece, 2024 October 16th - 18th

Organizers: Grigorios Itskos, Sohee Jeong and Jacky Even

Oral, Yuliia Kominko, presentation 019
DOI: https://doi.org/10.29363/nanoge.emlem.2024.019
Publication date: 13th July 2024

Lead halide perovskites (LHPs) have attracted immense attention via the combination of their exceptional optoelectronic properties (high quantum efficiency, spectral tunability, large carrier diffusion length, high light absorption coefficient, long carrier lifetimes, narrow emission line width, good defect tolerance).^[1] Considering their advantages, LHPs are prospective materials for LEDs, solar cells, and lasers. Particularly, colloidal NCs are widely employed for optoelectronic applications due to size control, compositional mixing, band gap and emission tuning. Meanwhile, they generally have poor stability at high excitation densities.^[2] Typically, this is associated with organic ligands capping the NCs even in dense films. Meanwhile, solution-processed films suffer from defects such as voids, substantially impacting their performance.

This study comprehensively investigates a method of forming compact nanocrystalline thin films through single-source thermal evaporation of CsPbX₃ (X = Cl or Br). Initially, amorphous films are aged at room temperature to form defined nanocrystalline domains with preferential orientation. Moreover, the resulting films show low-threshold amplified spontaneous emission under ambient conditions across and remarkable operating stability surpassing 180 million laser shots (i.e. 5 hours of continuous operation) with a net modal gain of 1240 cm^-1. The results show that evaporated perovskite films are promising optical gain media for lasing applications under ambient conditions.

References:

[1] Yakunin, S.; Protesescu, L.; Krieg, F. et al. Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of caesium lead halide perovskites. Nat Commun. 2015, 6, 8056.

[2] Dey A.; Ye J.; De A. et al.. State of the Art and Prospects for Halide Perovskite Nanocrystals. ACS Nano 2021, 15, 7, 10775-10981.

Acknowledgements:

We gratefully acknowledge ScopeM for their support and assistance in this work and European Research Council (Grant Agreement No. 819740, SCALE-HALO) for the financial support.

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