Organometallic Compound Resurfacing Stabilizes all-inorganic Tin-based Perovskite Nanocrystals Against Antisolvents Treatment

Huiyuan Cheng^a, Mengmeng Hao^a, Shanshan Ding^a, Donxu He^a, Bowei Zhang^a, Qishuo Yang^b, Miaoqiang Lyv^a^,^c, Peng Chen^a, Zitong Wang^a, Hongzhe Xu^a, Julian Steele^a^,^d, Lianzhou Wang^a^,^c

^aAustralian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD 4072, Australia

^bSchool of Mechanical and Mining Engineering, The University of Queensland, St Lucia, 4072, Queensland, Australia

^cNanomaterials Centre, School of Chemical Engineering, The University of Queensland, St Lucia, QLD 4072, Australia

^dSchool of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, 4072 Australia

NIPHO
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO24)

Sardinia, Italy, 2024 June 17th - 18th

Organizers: Giulia Grancini, Francesca Brunetti and Maria Antonietta Loi

Oral, Huiyuan Cheng, presentation 008
Publication date: 25th April 2024

Colloidal tin-based perovskite nanocrystals have gaining attention for their excellent optoelectronic properties and reduced or negligible toxicity, showing promise for various commercial applications. However, the isolation and purification of the as-synthesized all-inorganic tin-based perovskite nanocrystals remain a challenge, as they rapidly undergo decomposition in common antisolvents and an open atmosphere.[1] Here we mitigate such instabilities and endow strong resistance to antisolvent by introducing an organometallic compound (zinc diethyldithiocarbamate [Zn(DDTC)₂]) during the solution-based synthesis of CsSnI₃ nanocrystals. Thiourea and H₂S are shown to be generated through the thermal-driven conversion of Zn(DDTC)₂ during synthesis, which bind to un-passivated Sn sites on the nanocrystal surface and shields it from irreversible oxidation reactions.[2] The CsSnI₃ nanocrystals resurfaced with thiourea shown great stability after two antisolvent washing cycles using methyl acetate (MeOAc), without any change in morphology, phase, and optical properties. These findings deliver an effective in-situ modification pathway during the synthesis of stable tin-based perovskites and viable platform to explore all-inorganic tin-based nanocrystals optoelectronics.

References:

[1] Liu, F.; Ding, C.; Zhang, Y.; Ripolles, T. S.; Kamisaka, T.; Toyoda, T.; Hayase, S.; Minemoto, T.; Yoshino, K.; Dai, S.; Yanagida, M.; Noguchi, H.; Shen, Q., Colloidal Synthesis of Air-Stable Alloyed CsSn1–xPbxI3 Perovskite Nanocrystals for Use in Solar Cells. J. Am. Chem. Soc. 2017, 139 (46), 16708-16719.

[2] Jung, Y. K.; Kim, J. I.; Lee, J.-K., Thermal decomposition mechanism of single-molecule precursors forming metal sulfide nanoparticles. J. Am. Chem. Soc. 2010, 132 (1), 178-184.

Acknowledgements:

This work was supported by the Australian Research Council (ARC) Laureate Fellowship (FL190100139), Discovery Project (DP200101900), and Discovery Early Career Researcher Award (DE230100173). H. C. acknowledges financial support from the Australian Government through the Research Training Program Scholarship.

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