Issue 30, 2022

Ethanol-assisted synthesis of two-dimensional tin(ii) halide perovskite single crystals for amplified spontaneous emission

Abstract

Two-dimensional (2D) Ruddlesden–Popper perovskites (RPPs) are emerging as star materials for their superior optoelectronic properties. In particular, lead-free tin(II)-based 2D RPPs have recently gained more attention. However, until now, 2D tin(II)-based perovskite lasing has not been achieved. High-quality single crystals (SCs) with a low trap density are a good gain medium candidate for lasing. Unfortunately, research on the controllable synthesis of tin(II)-based SCs is still very limited. In this work, we developed a novel synthesis strategy in which ethanol was introduced to control the solubility of the perovskite precursors. We prepared high-quality RPP (TEA)2(MA)n−1SnnI3n+1 (n = 1 or n = 2, TEA = 2-thiopheneethylamine, MA = methylamine) SCs, and investigated their structural and optical properties. The exciton binding energy of tin(II)-based 2D perovskites was fitted to 184.1 meV and 46.13 meV for (TEA)2SnI4 (n = 1) and (TEA)2(MA)Sn2I7 (n = 2) SCs, respectively, which is much higher than for polycrystalline thin films. We further investigated the optical gain behavior of the tin(II)-based 2D perovskites. The amplified spontaneous emission (ASE) of exfoliated SCs was demonstrated at 20 K with a threshold of 29.1 μJ cm−2 for (TEA)2SnI4 (n = 1) and 630.1 μJ cm−2 for (TEA)2(MA)Sn2I7 (n = 2).

Graphical abstract: Ethanol-assisted synthesis of two-dimensional tin(ii) halide perovskite single crystals for amplified spontaneous emission

Supplementary files

Article information

Article type
Paper
Submitted
06 May 2022
Accepted
23 Jun 2022
First published
04 Jul 2022

J. Mater. Chem. C, 2022,10, 10902-10907

Ethanol-assisted synthesis of two-dimensional tin(II) halide perovskite single crystals for amplified spontaneous emission

G. Ding, X. He, H. Zhang and H. Fu, J. Mater. Chem. C, 2022, 10, 10902 DOI: 10.1039/D2TC01873J

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