Revealing the Role of Tin(IV) Halides in the Anisotropic Growth of CsPbX3 Perovskite Nanoplates |
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Authors: | Luiz G Bonato Raphael F Moral Gabriel Nagamine Arthur Alo Jos C Germino Douglas S da Silva Diogo B Almeida Luiz F Zagonel Fernando Galembeck Lzaro A Padilha Ana Flvia Nogueira |
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Institution: | Luiz G. Bonato,Raphael F. Moral,Gabriel Nagamine,Arthur Alo,José C. Germino,Douglas S. da Silva,Diogo B. Almeida,Luiz F. Zagonel,Fernando Galembeck,Lázaro A. Padilha,Ana Flávia Nogueira |
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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. |
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Keywords: | CsPbBr3 CsPbI3 nanoplatelets nanoplates perovskites |
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