Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.157
Publication date: 22nd December 2022
Hybrid perovskites have recently emerged as a promising material for optoelectronic applications due to their unique combination of properties. In particular, their 2D crystalline form is of great interest since the alternating inorganic and organic layers naturally form a multiple quantum-well structure, leading to the formation of stable excitonic resonances at room temperature. However, a controlled modulation of the quantum well width, which is defined by the number of inorganic layers (n) between two organic ones, is not straightforward and represents the main synthetic challenge in the field. This study presents a novel approach to easily tune the number of inorganic layers (n) in lead iodide perovskite single-crystalline flakes. This approach exploits an iodide salt as an additive that acts as an additional source of I−, inducing the generation of iodoplumbate species and resulting in an increase of the monomer density, resulting in the fine-tuning of the n value. Unlike other methods, our protocol allows us to fix the molar ratio of precursors and to control the "n" value by simply modulating the amount of potassium iodide (KI) added to the solution. The excellent optical quality of the synthesized flakes enables an in-depth analysis by Fourier-space microscopy, which reveals that the excitons orientation can be manipulated by modifying the number of inorganic layers. It is found that the excitonic out-of-plane component is enhanced when n is increased. This combined advance in synthesis and optical characterization provides a better understanding of the exciton behavior in low-dimensional perovskites, opening up possibilities for the design of materials with improved optoelectronic characteristics.
The authors gratefully thank Paolo Cazzato and Sonia Carallo for technical support. This research was funded by Apulia Region, project “Progetto Tecnopolo per la Medicina di precisione,” grant number: Deliberazione della Giunta Regionale n. 2117 del 21/11/2018, by Ministry of University and Scientific Research (MIUR), project Progetti di Rilevante Interesse Nazionale Interacting Photons in Po-lariton Circuits—INPhoPOL, grant number: 2017P9FJBS_001, by Ministry of University and Scientific Research (MIUR), project FISR—C.N.R. “Tecnopolo di nanotecnologia e fotonica per la medicina di precisione,” grant number: CUP B83B17000010001, and by National Research Council, Bilateral Project CNR/RFBR (RUSSIA). A.R. gratefully acknowledges the project Best4U—“Tecnologia per celle solari bifacciali ad alta Efficienza a 4 terminali per utility scale” founded by the Italian Ministry of University ad Scientific Research (MIUR), Bando PON R&I 2014–2020 e Fondo di Sviluppo e Coesione “Avviso per la presentazione di Progetti di Ricerca Industriale e Sviluppo Sperimentale nelle 12 aree di Specializzazione individuate dal Programma nazionale per la ricerca 2015–2020”—decreto concessione agevolazione protocollo 991 del 21 maggio 2019 MIUR (Contract number: PON ARS01_00519; CUP B88D19000160005).
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.