Issue 15, 2023

Stabilizing FASnI3-based perovskite light-emitting diodes with crystallization control

Abstract

The toxicity of lead presents a critical challenge for the application of perovskite optoelectronics. Lead-free perovskite solar cells were achieved with formamidinium tin iodide (FASnI3) perovskites, exhibiting decent power-conversion efficiencies (PCEs) of up to 14%, with >98% of the initial PCE retained after 3000 h of storage. However, when employed in light-emitting applications, FASnI3-based perovskite LEDs (PeLEDs) show limited stability, with T50 lifetimes of up to 0.25 h at 10 mA cm−2. Here, we improve the stability of FASnI3-based PeLEDs through the inclusion of a two-dimensional precursor phenethylamine iodide (PEAI), allowing controlled crystallization of the mixed-dimensional perovskite emitters. The density of defects is found to be reduced, accompanied by the suppression of oxidation from Sn2+ to Sn4+. Using an optimized perovskite composition, we achieve an EQE of 1.5% (a ∼10-fold improvement over the control devices), a maximum radiance of 145 W sr−1 m−2, and a record-long T50 lifetime of 10.3 h at 100 mA cm−2 for FASnI3-based PeLEDs. Our results illuminate an alternative path toward lead-free PeLED applications.

Graphical abstract: Stabilizing FASnI3-based perovskite light-emitting diodes with crystallization control

Supplementary files

Article information

Article type
Paper
Submitted
11 Jan 2023
Accepted
25 Mar 2023
First published
27 Mar 2023

Nanoscale, 2023,15, 6954-6959

Stabilizing FASnI3-based perovskite light-emitting diodes with crystallization control

G. Zhang, S. Xing, X. Cao, B. Zhao and D. Di, Nanoscale, 2023, 15, 6954 DOI: 10.1039/D3NR00177F

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