Synthesis and Polarized Emission of Lead Halide Perovskite Nanorods

Prof. Andrey L. Rogach
Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP)
City University of Hong Kong, Hong Kong SAR
Email: andrey.rogach@cityu.edu.hk

Metal halide perovskites have recently emerged as a new class of efficiently emitting materials for optoelectronic applications [1,2]. Semiconductor nanorods in general and perovskite nanorods in particular offer a useful property of linearly polarized light emission, which is important for application in displays [2, 3]. I will introduce several recently developed synthetic strategies towards perovskite nanorods with strong, color tunable anisotropic emission [4-6], and discuss how the halide composition of perovskite nanorods influences their fluorescence anisotropy [7].

References

1. Y. Li, X. Zhang, H. Huang, S. V. Kershaw, A. L. Rogach. Advances in Metal Halide Perovskite Nanocrystals: Synthetic Strategies, Growth Mechanisms, and Optoelectronic Applications. Mater. Today 2020, 32, 204-221.
2. M. Lu, Y. Zhang, S. Wang, J. Guo, W. W. Yu, A. L. Rogach. Metal Halide Perovskite Light-Emitting Devices: Promising Technology for Next-Generation Displays. Adv. Funct. Mater. 2019, 1902008.
3. A. K. Srivastava, W. Zhang, J. Schneider, J. E. Halpert, A. L. Rogach. Luminescent Down-Conversion Semiconductor Quantum Dots and Aligned Quantum Rods for Liquid Crystal Displays. Adv. Sci. 2019, 1901345.
4. Y. Li, H. Huang, Y. Xiong, A. F. Richter, S. V. Kershaw, J. Feldmann, A. L. Rogach. Using Polar Alcohols for the Direct Synthesis of Cesium Lead Halide Perovskite Nanorods with Anisotropic Emission. ACS Nano 2019, 13, 8237-8245.
5. S. Wang, J. Yu, M. Zhang, D. Chen, C. Li, R. Chen, G. Jia, A. L. Rogach, X. Yang. Stable, Strongly Emitting Cesium Lead Bromide Perovskite Nanorods with High Optical Gain Enabled by an Intermediate Monomer Reservoir Synthetic Strategy. NanoLett. 2019, 19, 6315-6322.
6. J. Guo, Y. Fu, M. Lu, X. Zhang, S. Kershaw, J. Zhang, S. Luo, Y. Li, W. W. Yu, H. Song, A. L. Rogach, L. Zhang, X. Bai. Cd-Rich Alloyed CsPb1-xCdxBr3 Perovskite Nanorods with Tunable Blue Emission and Fermi Levels Fabricated through Crystal Phase Engineering. Adv. Sci. 2020, 2000930.
7. Y. Dou, F. Cao, T. Dudka, Y. Li, S. Wang, C. Zhang, Y. Gao, X. Yang, A. L. Rogach. Lattice Distortion in Mixed-Anion Lead Halide Perovskite Nanorods Leads to their High Fluorescence Anisotropy. ACS Mater. Lett. 2020, 2, 814-820.

Biography: Prof. Andrey L. Rogach is a Chair Professor of Photonics Materials at the Department of Materials Science and Engineering, and the Founding Director of the Centre for Functional Photonics at City University of Hong Kong. He received his Ph.D. in Chemistry (1995) from the Belarusian State University in Minsk (Belarus), and worked as a staff scientist at the University of Hamburg (Germany) from 1995 to 2002. From 2002–2009 he was a lead staff scientist at the University of Munich (Germany), where he completed his habilitation in Experimental Physics. His research focuses on synthesis, assembly and optical spectroscopy of colloidal semiconductor and metal nanocrystals and their hybrid structures, and their use for energy-related applications. He authored over 500 scientific publications (Google Scholar h-index: 117) in these fields that have been extensively (over 50,000) cited, which ranked him among “100 TOP MATERIALS SCIENTISTS OF THE PAST DECADE” by Thomson Reuters (2011), and as a Highly Cited Researcher by Clarivate Analytics (2018-2020). He holds honourable appointments as an Adjunct Professor at Trinity College Dublin (Ireland) and University of Electronic Science and Technology of China, and as a Honorary Professor at Xi’An Jiaotong University, Jilin University, and Peking University Shenzhen (China). Andrey Rogach is a Fellow of the Electromagnetic Academy (USA) and serves as an Associate Editor of ACS Nano.

Surface Chemistry of Colloidal Cesium Lead Halides Perovskite Nanocrystals and its Impact on the Characteristics of Blue and Green perovskite LEDs

Dr. Maryna Bodnarchuk
Group Leader
Empa-Swiss Federal Laboratories for Materials Science and Technology, CH-8600, Dübendorf, Switzerland
Email: Maryna.Bodnarchuk@empa.ch

Colloidal organic/inorganic lead halide perovskite nanocrystals (NCs) are considered promising blue and green narrow-band emitters for the next-generation light-emitting diodes.  High photoluminescence efficiencies are attained in these materials without epitaxial over-coating of the NC surfaces for electronic passivation of the surface states. The major practical bottleneck of these materials relates to their labile surface chemistry. In particular, typically used ling chain capping ligands are problematic due to their dynamic and loose binding as well as their highly insulating nature. We have recently rationalized the typical observation of a degraded luminescence upon aging or the luminescence recovery upon post-synthesis surface treatments using a simple surface-structure model, supported by DFT calculations. Healing of the surface trap states requires restoration of all damaged PbX6 octahedra and establishing a stable outer ligand shell. Restoration of such a structure, seen as an increase in the luminescence quantum efficiency to 90-100% and improvement in the over-all robustness of CsPbBr3 NCs, was attained using a facile post-synthetic treatment with a PbBr2+DDAB (didodecyldimethylammonium bromimde) mixture. In our most recent work, we have used DDAB as a sole ligand directly in the synthesis of perovskite NCs. We then used such NCs in LEDs and demonstrate high external quantum efficiencies in blue region and green region   .

Biography: Dr. Maryna Bodnarchuk received her PhD degree in natural sciences from the Johannes Kepler University Linz (Austria) in 2009, worked as a postdoctoral fellow at University of Chicago and in 2011 she joined the Laboratory of Inorganic Chemistry of ETH Zurich as a Marie Heim-Vögtlin fellow and then as Ambizione Energy fellow supported by SNSF. In 2016 she was appointed as group leader in the laboratory of Thin Films and Photovoltaic at Empa - Swiss Federal Laboratories for Materials Science and Technology, Switzerland. Her research interests and areas of expertise include synthesis, self-assembly and characterization of novel inorganic nanostructures. These materials find applications in optoelectronic devices and energy storage.

Resonant perovskite nanostructures for advanced photonic applications

Prof. S. V. Makarov
ITMO University,
Saint Petersburg,
Russia
Email: s.makarov@metalab.ifmo.ru

Nanophotonics and meta-optics based on optically resonant all-dielectric structures is a rapidly developing research area driven by its potential applications for low-loss efficient metadevices. Recently, the study of halide perovskites has attracted enormous attention due to their exceptional optical and electrical properties. As a result, this family of materials can provide a prospective platform for modern nanophotonics [1] and meta-optics [2], allowing us to overcome many obstacles associated with the use of conventional semiconductor materials. Here, we overview the recent progress in the field of halide perovskite nanophotonics starting from single-particle light-emitting nanoantennas [3,4] and nanolasers [5] to the large-scale designs working for surface coloration, anti-reflection, and optical information encoding [6,7,8].

References:
[1] Makarov, S., Furasova, A., Tiguntseva, E., Hemmetter, A., Berestennikov, A., Pushkarev, A., Zakhidov, A. and Kivshar, Y., 2019. Advanced optical materials, 7(1), p.1800784.
[2] Berestennikov, A.S., Voroshilov, P.M., Makarov, S.V. and Kivshar, Y.S., 2019. Applied Physics Reviews, 6(3), p.031307.
[3] Tiguntseva, E.Y., Zograf, G.P., Komissarenko, F.E., Zuev, D.A., Zakhidov, A.A., Makarov, S.V. and Kivshar, Y.S., 2018. Nano letters, 18(2), pp.1185-1190.
[4] Tiguntseva, E.Y., Baranov, D.G., Pushkarev, A.P., Munkhbat, B., Komissarenko, F., Franckevicius, M., Zakhidov, A.A., Shegai, T., Kivshar, Y.S. and Makarov, S.V., 2018. Nano letters, 18(9), pp.5522-5529.
[5] Tiguntseva, E., Koshelev, K., Furasova, A., Tonkaev, P., Mikhailovskii, V., Ushakova, E.V., Baranov, D.G., Shegai, T., Zakhidov, A.A., Kivshar, Y. and Makarov, S.V., 2020. ACS Nano 13 (4), 4140-4147.
[6] Zhizhchenko, A., Syubaev, S., Berestennikov, A., Yulin, A.V., Porfirev, A., Pushkarev, A., Shishkin, I., Golokhvast, K., Bogdanov, A.A., Zakhidov, A.A. and Kuchmizhak, A.A., 2019. ACS nano, 13(4), pp.4140-4147.
[7] Zhizhchenko, A.Y., Tonkaev, P., Gets, D., Larin, A., Zuev, D., Starikov, S., Pustovalov, E.V., Zakharenko, A.M., Kulinich, S.A., Juodkazis, S. and Kuchmizhak, A.A., 2020. Small, 16(19), p.2000410.
[8] Trofimov, P., Pushkarev, A.P., Sinev, I.S., Fedorov, V.V., Bruyère, S., Bolshakov, A., Mukhin, I.S. and Makarov, S.V., 2020. ACS nano, 14(7), pp.8126-8134.

Biography: Prof. Sergey Makarov received a Ph.D. degree in 2014 at the Lebedev Physical Institute of the Russian Academy of Sciences (Moscow, Russia), and Habilitated at the ITMO University in 2018 (St. Petersburg, Russia). The topics of his research activity include nanophotonics, halide perovskites, laser-matter interaction, and nanotechnology.Currently, he is Professor, Head of Laboratory of Hybrid Nanophotonics and Optoelectronics, as well as Director of Shared Research Facilities on Nanotechnology at the ITMO University. He was a long-term visiting research fellow at Australian National University, City University of New York, and Vienna Technological University. He was awarded by Presidential Award for Young Researchers, Medal of Russian Academy of Sciences for Young Researchers, Gold Medal of Alferov’s Foundation, Saint-Petersburg Government Award in the field of technology, and many others.

Cesium and Formamidinium Lead Halide Perovskite Nanocrystals: Genesis and Present Developments
                       
Prof. (Dr) Maksym V. Kovalenko
1 ETH Zürich, Department of Chemistry and Applied Biosciences, CH-8093, Zurich, Switzerland
2 Empa-Swiss Federal Laboratories for Materials Science and Technology, CH-8600, Dübendorf, Switzerland
E-mail address: mvkovalenko@ethz.ch

We discuss the discovery and recent developments of colloidal lead halide perovskite nanocrystals (LHP NCs, NCs, A=Cs+, FA+, FA=formamidinium; X=Cl, Br, I) [1-5].  LHP NCs exhibit spectrally narrow (<100 meV) fluorescence, originating form bright triplet excitons [6], and tunable over the entire visible spectral region of 400-800 nm. Cs- and FA-based perovskite NCs are promising for LCD displays, for light-emitting diodes and as precursors/inks for perovskite solar cells.  Perovskite NCs also readily form long-range ordered superlattices, which exhibit accelerated coherent emission (superfluorescence) [7]. Unique structure engineerability of perovskites allows for (nearly) independent tuning of the emission color and radiative rates, which can be used in printable unicolor security tags [8].

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Biography: Prof. Maksym Kovalenko is a professor at ETH Zürich (Swiss Federal Institute of Technilogy in Zürich), Switzerland. He received his PhD degree in nanoscience and nanotechnology from Johannes Kepler University Linz, Austria, in 2007. He then joined the University of Chicago as a postdoctoral fellow, studying the surface chemistry and self-assembly of colloidal nanocrystals. In 2011, Kovalenko joined ETH Zürich and Empa (Swiss Federal Laboratories for Materials Science and Technology) as a tenure-track assistant professor, an associate professor in 2017, and a full professor in 2020. His research interests include chemistry, physics, and applications of functional inorganic materials, including colloidal quantum dots, novel solid-state compounds, and materials for electrochemical energy storage. Present research efforts of the Functional Inorganic Materials group concern: (i) the precision synthesis of highly luminescent semiconductor nanocrystals; (ii) nanocrystal surface chemistry; (iii) exploration of novel semiconductor materials by solution- and solid-state synthesis; (iv) novel semiconductors for hard radiation detection; (iv) novel materials and concepts for Li-ion and post-Li-ion rechargeable batteries. Many of these activities are strongly linked to industrial partners. Academic collaborations involve various groups ranging from first-principles theory of materials to applications in photovoltaics and thermoelectrics He has co-authored 285 publications, 3 book chapters, and holds 12 patent applications. He has been the recipient of highly prestigious awards including ERC Consolidator Grant (2018), ERC Starting Grant (2012), Ruzicka Preis (2013), and Werner Prize (2016). He is a Clarivate Highly Cited Researcher since 2018. He also serves as an associate editor of the Chemistry of Materials.