Photophysics of Sn-based 2D Perovskite Films Inkjet-Printed on a Flexible Substrate: Double Excitonic Band and Amplified Spontaneous Emission
Vladimir Chirvony a, Isaac Suarez b, Giovanni Vescio c, Blas Carrido c, Albert Cirera c, Dmitry Dirin d e, Maksym Kovalenko d e, Guillermo Muñoz-Matutano a, Juan Martínez-Pastor a
a UMDO Instituto de Ciencia de los Materiales- Universidad de Valencia
b Escuela Técnica Superior de Ingeniería, Universidad de Valencia, Valencia 46100, Spain, Avenida de la Universidad s/n, Burjassot, Spain
c Applied Nanoelectronics, Department of Electronics, University of Barcelona, 08028 Barcelona, Spain
d Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich 8093, Switzerland
e Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
Proceedings of Sustainable Metal-halide perovskites for photovoltaics, optoelectronics and photonics (Sus-MHP)
València, Spain, 2022 December 12th - 13th
Organizers: Teresa S. Ripolles and Hui-Seon Kim
Oral, Vladimir Chirvony, presentation 024
Publication date: 15th November 2022

Currently, there is a great demand for non-toxic lead-free perovskites as active materials for solar cells and light-emitting diodes (LEDs). In the first case, great progress has been made using 3D tin perovskites. At the same time, the search for a suitable lead-free perovskite material for LEDs is just at the beginning. From general considerations and by analogy with lead-containing perovskites, the most suitable structures for optoelectronic light-emitting devices should be 2D perovskites since they possess higher stability and high exciton binding energy resulting in high photoluminescence (PL) ability. An additional requirement from industry for such a material is a possibility to be manufactured by inkjet-printing on a flexible substrate. In this work, we have studied PL properties of chemically stabilized 2D perovskite thienylethylammonium tin iodide, (TEA)2SnI4, thin films of which were produced by inkjet-printing of precursors on a flexible polymer substrate (polyimide, PI). PL measurements performed in the 20–300 K temperature range made it possible to detect two equally narrow excitonic bands observed in the 630 - 665 nm region both in emission and absorption and exhibiting different dependences on the observation angle. In addition, m-PL mapping experiments indicate different spatial localization of radiation from these two excitons. Besides, amplified spontaneous emission and bi-exciton formation were detected at high intensity excitation at 20 K. All the above findings indicate high photophysical quality of thin (TEA)2SnI4 films inkjet-printed on flexible PI polymer that make them a promising non-toxic perovskite material for fabrication of efficient LEDs and microlasers.Currently, there is a great demand for non-toxic lead-free perovskites as active materials for solar cells and light-emitting diodes (LEDs). In the first case, great progress has been made using 3D tin perovskites. At the same time, the search for a suitable lead-free perovskite material for LEDs is just at the beginning. From general considerations and by analogy with lead-containing perovskites, the most suitable structures for optoelectronic light-emitting devices should be 2D perovskites since they possess higher stability and high exciton binding energy resulting in high photoluminescence (PL) ability. An additional requirement from industry for such a material is a possibility to be manufactured by inkjet-printing on a flexible substrate. In this work, we have studied PL properties of chemically stabilized 2D perovskite thienylethylammonium tin iodide, (TEA)2SnI4, thin films of which were produced by inkjet-printing of precursors on a flexible polymer substrate (polyimide, PI). PL measurements performed in the 20–300 K temperature range made it possible to detect two equally narrow excitonic bands observed in the 630 - 665 nm region both in emission and absorption and exhibiting different dependences on the observation angle. In addition, m-PL mapping experiments indicate different spatial localization of radiation from these two excitons. Besides, amplified spontaneous emission and bi-exciton formation were detected at high intensity excitation at 20 K. All the above findings indicate high photophysical quality of thin (TEA)2SnI4 films inkjet-printed on flexible PI polymer that make them a promising non-toxic perovskite material for fabrication of efficient LEDs and microlasers.

This work was made possible by the Horizon 2020 research and innovation program through the DROP-IT project (Grant Agreement No. 862656) and the financial support from MINECO (Spain) for Grant PID2019-105658RB-I00 (PRITES Project).

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