Issue 38, 2023

Deciphering the roles of ammonium doping for lead-free (NH4)xCs3−xCu2I5 perovskites to regulate the photoelectronic properties

Abstract

Inorganic ammonium (NH4+) is the simplest amine cation with perfect symmetry, the smallest radius and many H atoms, allowing itself to be used as a potential dopant in achieving high-quality perovskite materials. As a composition-modulation strategy, NH4+-doped (NH4)xCs3−xCu2I5 (0 < x < 1.5) lead-free perovskites were successfully synthesized via the eco-friendly ball milling method in this work. As the ammonium content increases, the lattice constants of (NH4)xCs3−xCu2I5 shrink and the grain sizes increase. The doping of NH4+ effectively passivates the lattice defects, suppresses the non-radiative recombination and tunes the energy band structure, resulting in better fluorescence properties. UV-pumped deep-blue LEDs based on (NH4)xCs3−xCu2I5 phosphors were fabricated, which showed improved performance and tunable emission. These results demonstrate the potential of the NH4+-doping strategy for improving the performance of lead-free perovskite optoelectronics.

Graphical abstract: Deciphering the roles of ammonium doping for lead-free (NH4)xCs3−xCu2I5 perovskites to regulate the photoelectronic properties

Supplementary files

Article information

Article type
Communication
Submitted
08 Mar 2023
Accepted
03 Apr 2023
First published
04 Apr 2023

Chem. Commun., 2023,59, 5677-5680

Deciphering the roles of ammonium doping for lead-free (NH4)xCs3−xCu2I5 perovskites to regulate the photoelectronic properties

Z. Xu, L. Jiang, H. Xiong, J. Wen, P. Li, L. Lin, B. Wu, A. Yang and Y. Qiu, Chem. Commun., 2023, 59, 5677 DOI: 10.1039/D3CC01148H

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