DataVXAdvanced Functional MaterialsPaper
journal article·2024-04Open access

The Role of the Organic Cation in Developing Efficient Green Perovskite LEDs Based on Quasi‐2D Perovskite Heterostructures

Alexandra J. Ramadan, Woo Hyeon Jeong, Robert D. J. Oliver, Junke Jiang, Akash Dasgupta, Zhongcheng Yuan, Joel Smith, Jae Eun Lee, Silvia G. Motti, Olivia Gough, Zhenlong Li, Laura M. Herz, Michael B. Johnston, Hyosung Choi, Jacky Even, Claudine Katan, Bo Ram Lee, Henry J. Snaith

Advanced Functional Materials· Volume 34· Issue 14
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Source abstract

Abstract

Abstract Two dimensional/three‐dimensional (2D/3D) metal halide perovskite heterostructures have attracted great interest in photovoltaic and light‐emitting diode (LEDs) applications. In both, their implementation results in an improvement in device efficiency yet the understanding of these heterostructures remains incomplete. In this work the role of organic cations, essential for the formation of 2D perovskite structures is unraveled, in a range of metal halide perovskite heterostructures. These heterostructures are used to fabricate efficient green perovskite LEDs and a strong dependence between cation content and device performance is shown. The crystal structure, charge‐carrier transport and dynamics, and the electronic structure of these heterostructures are studied and it is shown that the presence of crystalline 2D perovskite inhibits electron injection and ultimately lowers device performance. This work highlights the importance of optimizing the composition of these heterostructures in ensuring optimal device performance across all parameters and suggests that developing routes to inject charge‐carriers directly into 2D perovskite structures will be important in ensuring the continued development of perovskite LEDs based on these heterostructures.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics and Astronomy University of Sheffield Hounsfield Road Sheffield S3 7RH UK

Clarendon Laboratory Department of Physics University of Oxford Parks Road Oxford OX1 3PU UK

School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 16419 Republic of Korea

CNRS, ISCR – UMR 6226 Univ Rennes ENSCR INSA Rennes Rennes F‐35000 France

School of Physics and Astronomy Faculty of Engineering and Physical Sciences University of Southampton University Road Southampton SO17 1BJ UK

Institute for Advanced Study TU Munich Lichtenbergstr. 2a 85748 Garching Germany

Department of Chemistry Research Institute for Convergence of Basic Sciences and Research Institute for Natural Science Hanyang University Seoul 04763 Republic of Korea

Institut FOTON─UMR 6082 Univ Rennes INSA Rennes CNRS Rennes F‐35000 France

Funding

Engineering and Physical Sciences Research Council · National Research Foundation of Korea · Institut Universitaire de France · European Synchrotron Radiation Facility · Horizon 2020 Framework Programme

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