Mixing A-cations improves the Photoluminescence and Stability of Lead Halide Perovskite Nanocrystals

Clara Otero-Martínez^a, Junzhi Ye^b, Akshay Rao^b, Liberato Manna^c, Robert L. Z. Hoye^d, Jorge Pérez-Juste^a, Lakshminarayana Polavarapu^a

^aCINBIO,University of Vigo, Spain, Campus Universitario Lagoas, Estrada de Marcosende, Vigo, Spain

^bCavendish laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB30HE, UK.

^cDepartment of Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy

^dDepartment of Materials, Imperial College London, South Kensington Campus, London, United Kingdom

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)

#NCFun23 - Fundamental Processes in Nanocrystals and 2D Materials

VALÈNCIA, Spain, 2023 March 6th - 10th

Organizers: Valerio Pinchetti and Shalini Singh

Oral, Clara Otero-Martínez, presentation 101
DOI: https://doi.org/10.29363/nanoge.matsus.2023.101
Publication date: 22nd December 2022

Recently, lead halide perovskite nanocrystals (LHP NCs) have emerged as a highly promising class of luminescent materials. The optical properties of LHP NCs are easily tunable by their dimensions as well as chemical composition, and they exhibit extremely high photoluminescence quantum yield (PLQY).^{1, 2} Despite great progress in the synthesis and application of LHP NCs, they still suffer from poor surface stability and thus leading to a drastic reduction of PLQY upon washing them.^{3, 4} Interestingly, we find that the PLQY and surface stability of inorganic LHP NCs significantly improves upon replacing some of the inorganic A-cations (Cs⁺) with organic cations (FA⁺ or MA⁺) by cation exchange. Recently, we demonstrated the preparation of mixed A-cation NC systems with a range of compositions by simple room-temperature cation exchange.⁵ Unlike halide segregation, the A-cations in the lattice do not undergo phase segregation under light illumination.⁵ We then systematically studied the surface stability as well as the optical properties of mixed A-cation LHP NCs by washing them several times with an antisolvent. Surprisingly, the mixed A-cation compositions with a small percentage of organic cation exhibit superior stability and PLQY as compared with inorganic LHP NCs upon washing them with antisolvent. In this presentation, I will discuss the synthesis, optical properties, and stability of mixed A-cation LHP NCs in comparison with individual counterparts.

References:

[1] Shamsi, J.; Urban, A. S.; Imran, M.; De Trizio, L.; Manna, L., Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications, and Their Optical Properties. Chemical Reviews 2019, 119 (5), 3296-3348.

[2] Dey, A.; Ye, J.; De, A.; Debroye, E.; Ha, S. K.; Bladt, E.; Kshirsagar, A. S.; Wang, Z.; Yin, J.; Wang, Y.; Quan, L. N.; Yan, F.; Gao, M.; Li, X.; Shamsi, J.; Debnath, T.; Cao, M.; Scheel, M. A.; Kumar, S.; Steele, J. A.; Gerhard, M.; Chouhan, L.; Xu, K.; Wu, X.-g.; Li, Y.; Zhang, Y.; Dutta, A.; Han, C.; Vincon, I.; Rogach, A. L.; Nag, A.; Samanta, A.; Korgel, B. A.; Shih, C.-J.; Gamelin, D. R.; Son, D. H.; Zeng, H.; Zhong, H.; Sun, H.; Demir, H. V.; Scheblykin, I. G.; Mora-Seró, I.; Stolarczyk, J. K.; Zhang, J. Z.; Feldmann, J.; Hofkens, J.; Luther, J. M.; Pérez-Prieto, J.; Li, L.; Manna, L.; Bodnarchuk, M. I.; Kovalenko, M. V.; Roeffaers, M. B. J.; Pradhan, N.; Mohammed, O. F.; Bakr, O. M.; Yang, P.; Müller-Buschbaum, P.; Kamat, P. V.; Bao, Q.; Zhang, Q.; Krahne, R.; Galian, R. E.; Stranks, S. D.; Bals, S.; Biju, V.; Tisdale, W. A.; Yan, Y.; Hoye, R. L. Z.; Polavarapu, L., State of the Art and Prospects for Halide Perovskite Nanocrystals. ACS Nano 2021, 15 (7), 10775–10981.

[3] Hoshi, K.; Chiba, T.; Sato, J.; Hayashi, Y.; Takahashi, Y.; Ebe, H.; Ohisa, S.; Kido, J., Purification of Perovskite Quantum Dots Using Low-Dielectric-Constant Washing Solvent “Diglyme” for Highly Efficient Light-Emitting Devices. ACS Applied Materials & Interfaces 2018, 10 (29), 24607-24612.

[4] Ye, J.; Li, Z.; Kubicki, D. J.; Zhang, Y.; Dai, L.; Otero-Martínez, C.; Reus, M. A.; Arul, R.; Dudipala, K. R.; Andaji-Garmaroudi, Z.; Huang, Y.-T.; Li, Z.; Chen, Z.; Müller-Buschbaum, P.; Yip, H.-L.; Stranks, S. D.; Grey, C. P.; Baumberg, J. J.; Greenham, N. C.; Polavarapu, L.; Rao, A.; Hoye, R. L. Z., Elucidating the Role of Antisolvents on the Surface Chemistry and Optoelectronic Properties of CsPbBrxI3-x Perovskite Nanocrystals. Journal of the American Chemical Society 2022, 144 (27), 12102-12115.

[5] Otero-Martínez, C.; Imran, M.; Schrenker, N. J.; Ye, J.; Ji, K.; Rao, A.; Stranks, S. D.; Hoye, R. L. Z.; Bals, S.; Manna, L.; Pérez-Juste, J.; Polavarapu, L., Fast A-Site Cation Cross-Exchange at Room Temperature: Single-to Double- and Triple-Cation Halide Perovskite Nanocrystals. 2022, 61 (34), e202205617.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.