Inkjet‐Printed Red‐Emitting Flexible LEDs Based on Sustainable Inks of Layered Tin Iodide Perovskite

Author:

Vescio Giovanni1ORCID,Dirin Dmitry N.23ORCID,González‐Torres Sergio1,Sanchez‐Diaz Jesús4,Vidal Rosario5ORCID,Franco Iván P.45,Adhikari Samrat Das4ORCID,Chirvony Vladimir S.6ORCID,Martínez‐Pastor Juan P.6ORCID,Vinocour Pacheco Felipe A.7,Przypis Lukasz8ORCID,Öz Senol910,Hernández Sergi1ORCID,Cirera Albert1ORCID,Mora‐Seró Iván4ORCID,Kovalenko Maksym V.23ORCID,Garrido Blas1

Affiliation:

1. MIND‐IN2UB Department of Electronics and Biomedical Engineering Universitat de Barcelona Martí i Franquès 1 Barcelona 08028 Spain

2. Department of Chemistry and Applied Biosciences ETH Zürich Zürich CH‐8093 Switzerland

3. Laboratory for Thin Films and Photovoltaics Empa – Swiss Federal Laboratories for Materials Science and Technology Dübendorf CH‐8600 Switzerland

4. Institute of Advanced Materials (INAM) Universitat Jaume I (UJI) Avenida de Vicent Sos Baynat, s/n Castelló de la Plana 12071 Spain

5. Department of Mechanical Engineering and Construction GID Universitat Jaume I Av. SosBaynat s/n Castelló 12071 Spain

6. UMDO Instituto de Ciencia de los Materiales Universidad de Valencia Valencia 46980 Spain

7. Saule Research Institute Wroclaw 54‐427 Poland

8. Department of Semiconductor Materials Engineering Wroclaw University of Science and Technology Wroclaw 50‐370 Poland

9. Saule Technologies Wroclaw 54‐427 Poland

10. Solaveni GmbH 59199 Bönen Germany

Abstract

AbstractInkjet printing has emerged as a promising technique for the fabrication of halide perovskite (HP) thin films, as it enables precise and controlled deposition of the perovskite ink on a variety of substrates. One main advantage of inkjet printing for the fabrication of HP thin films is its ability to produce uniform films with controlled thickness and high coverage, which is critical for achieving high‐performance devices. Additionally, inkjet printing allows for the deposition of patterned thin films, enabling the fabrication of complex device architectures such as light‐emitting diodes (LEDs). In this work, flexible LEDs based on inkjet printed Pb‐free HP thiophene‐ethylammonium tin iodide (TEA2SnI4) are produced that has gained attention as a potential alternative to Pb‐based HPs in optoelectronic devices due to its lower toxicity, environmental impact, and high performance. The role of ink solutions is compared using pure solvents: toxic dimethyl formamide (DMF) and more eco‐friendly dimethyl sulfoxide (DMSO). Red‐emitting devices (λmax = 633 nm) exhibit, in ambient conditions, a maximum external quantum efficiency (EQEmax) of 0.5% with a related brightness of 21 cd m−2 at 54 mA cm−2 for DMSO‐based LEDs. The environmental impacts of films prepared with DMSO‐based solvents ensure only 40% of the impact caused by DMF.

Funder

European Commission

Conselleria de Cultura, Educación y Ciencia, Generalitat Valenciana

Ministerio de Ciencia, Innovación y Universidades

Publisher

Wiley

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