DDAB-assisted synthesis of iodine-rich CsPbI3 perovskite nanocrystals with improved stability in multiple environments

Huang, Yihui; Luan, Weiling; Liu, Mengke; Turyanska, Lyudmila

Abstract

© 2020 The Royal Society of Chemistry. All-inorganic cesium lead halide perovskite (CsPbX3, X = Cl, Br, I) nanocrystals (NCs) have attracted considerable attention due to their tunable optical properties and high optical quantum yield. However, their stability in various environments, such as different solvents, high temperature and UV light, remains to be addressed to enable their exploitation in devices. Here, we report on the synthesis of all inorganic CsPbI3 perovskite nanocrystals capped with didodecyldimethylammonium bromide (DDAB). Monodispersed DDAB-capped CsPbI3 NCs have enhanced stability with respect to their morphological and optical properties compared to conventional oleic acid (OA)/oleylamine (OLA) capped nanocrystals. The DDAB-CsPbI3 NCs retain an optical quantum yield >80% for at least 60 days. The enhanced stability is explained by the binding of branched DDAB ligands to the NC surface, leading to the formation of a halogen-rich surface, as confirmed by X-ray photoelectron spectroscopy, with an iodine to lead atomic ratio of I : Pb = 4 : 1. These perovskites were used in light-emitting diodes (LEDs) and have a maximum external quantum efficiency (EQE) of 1.25% and a luminance of 468 cd m-2, and demonstrated improved operational performance. The enhanced stability of DDAB-CsPbI3 in the environments relevant for device processing and operation is relevant for their exploitation in optoelectronics.

Citation

Huang, Y., Luan, W., Liu, M., & Turyanska, L. (2020). DDAB-assisted synthesis of iodine-rich CsPbI3 perovskite nanocrystals with improved stability in multiple environments. Journal of Materials Chemistry C, 8(7), 2381-2387. https://doi.org/10.1039/c9tc06566k

• Journal Article Type: Article
• Acceptance Date: Dec 30, 2019
• Online Publication Date: Jan 2, 2020
• Publication Date: Feb 21, 2020
• Deposit Date: Jan 6, 2020
• Publicly Available Date: Jan 3, 2021
• Journal: Journal of Materials Chemistry C
• Print ISSN: 2050-7526
• Electronic ISSN: 2050-7534
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 7
• Pages: 2381-2387
• DOI: https://doi.org/10.1039/c9tc06566k
• Keywords: Materials Chemistry; General Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/3678946
• Publisher URL: https://pubs.rsc.org/en/Content/ArticleLanding/2020/TC/C9TC06566K
• Additional Information: : This document is Similarity Check deposited; : Supplementary Information; : Single-blind; : Received 1 December 2019; Accepted 30 December 2019; Accepted Manuscript published 2 January 2020