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Tautomeric mixture coordination enables efficient lead-free perovskite LEDs.
- Source :
-
Nature [Nature] 2023 Oct; Vol. 622 (7983), pp. 493-498. Date of Electronic Publication: 2023 Aug 09. - Publication Year :
- 2023
-
Abstract
- Lead halide perovskite light-emitting diodes (PeLEDs) have demonstrated remarkable optoelectronic performance <superscript>1-3</superscript> . However, there are potential toxicity issues with lead <superscript>4,5</superscript> and removing lead from the best-performing PeLEDs-without compromising their high external quantum efficiencies-remains a challenge. Here we report a tautomeric-mixture-coordination-induced electron localization strategy to stabilize the lead-free tin perovskite TEA <subscript>2</subscript> SnI <subscript>4</subscript> (TEAI is 2-thiopheneethylammonium iodide) by incorporating cyanuric acid. We demonstrate that a crucial function of the coordination is to amplify the electronic effects, even for those Sn atoms that aren't strongly bonded with cyanuric acid owing to the formation of hydrogen-bonded tautomeric dimer and trimer superstructures on the perovskite surface. This electron localization weakens adverse effects from Anderson localization and improves ordering in the crystal structure of TEA <subscript>2</subscript> SnI <subscript>4</subscript> . These factors result in a two-orders-of-magnitude reduction in the non-radiative recombination capture coefficient and an approximately twofold enhancement in the exciton binding energy. Our lead-free PeLED has an external quantum efficiency of up to 20.29%, representing a performance comparable to that of state-of-the-art lead-containing PeLEDs <superscript>6-12</superscript> . We anticipate that these findings will provide insights into the stabilization of Sn(II) perovskites and further the development of lead-free perovskite applications.<br /> (© 2023. The Author(s), under exclusive licence to Springer Nature Limited.)
Details
- Language :
- English
- ISSN :
- 1476-4687
- Volume :
- 622
- Issue :
- 7983
- Database :
- MEDLINE
- Journal :
- Nature
- Publication Type :
- Academic Journal
- Accession number :
- 37557914
- Full Text :
- https://doi.org/10.1038/s41586-023-06514-6