Revealing the Role of Tin(IV) Halides in the Anisotropic Growth of CsPbX3 Perovskite Nanoplates

Author(s):Show less -

Bonato, Luiz G. ; Moral, Raphael F. ; Nagamine, Gabriel ; Alo, Arthur ; Germino, Jose C. ; da Silva, Douglas S. ; Almeida, Diogo B. ; Zagonel, Luiz F. ; Galembeck, Fernando ; Padilha, Lazaro A. ; Nogueira, Ana Flavia

• Document type: Journal article
• Source: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION; v. 59, n. 28, p. 9-pg., 2020-05-07.

Abstract

CsPbX3 perovskite nanoplates (PNPLs) were formed in a synthesis driven by SnX4 (X=Cl, Br, I) salts. The role played by these hard Lewis acids in directing PNPL formation is addressed. Sn4+ disturbs the acid-base equilibrium of the system, increasing the protonation rate of oleylamine and inducing anisotropic growth of nanocrystals. Sn4+ cations influence the reaction dynamics owing to complexation with oleylamine molecules. By monitoring the photoluminescence excitation and photoluminescence (PL) spectra of the PNPLs grown at different temperatures, the influence of the thickness on their optical properties is mapped. Time-resolved and spectrally resolved PL for colloidal dispersions with different optical densities reveals that the dependence of the overall PL lifetime on the emission wavelength do not originate from energy transfer between PNPLs but from the contribution of PNPLs with distinct thickness, indicating that thicker PNPLs exhibit longer PL lifetimes. (AU)

• FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
• Grantee: Ana Flávia Nogueira
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 14/50906-9 - INCT 2014: in Functional Complex Materials
• Grantee: Fernando Galembeck
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/16911-2 - Advanced spectroscopy of novel nanomaterials
• Grantee: Lázaro Aurélio Padilha Junior
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 18/15574-6 - Advanced spectroscopy of nanomaterials: from ensemble to single-particle
• Grantee: Lázaro Aurélio Padilha Junior
• Support Opportunities: Research Grants - Young Investigators Grants - Phase 2
• FAPESP's process: 16/02268-9 - Hybrid nanocomposites composed of cesium lead-halide perovskite quantum dots and semiconducting polymers for third generation solar cells
• Grantee: Raphael Fernando Moral
• Support Opportunities: Scholarships in Brazil - Master