Self-trapped emissions in 2D lead-free halide perovskites driven by divalent spacer cations†
Andre L. M.
Freitas, 
*a
Aryane
Tofanello,
a
Naidel A. M. S.
Caturello,
b
Karla K. F.
Barbosa
a
and
Fabio F.
Ferreira
a
*a
Aryane
Tofanello,
a
Naidel A. M. S.
Caturello,
b
Karla K. F.
Barbosa
a
and
Fabio F.
Ferreira
a
Abstract
The mono- and divalent spacer cation investigation in sodium/indium-based 2D double perovskites revealed significant impacts on optoelectronic properties due to distortions in the inorganic layers. The strong electron–phonon coupling in a novel lead-free Dion–Jacobson phase highlights a promising class for broad-emission devices based on self-trapped excitons (STE), offering enhanced structural stability.
- This article is part of the themed collection: Perovskites
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