DataVXACS Energy LettersPaper
journal article·2025-07-11Open access

Interfacial Chemistry Limits the Stability of Deep Blue Perovskite LEDs Revealed by Operando Characterization

Alessandro J. Mirabelli, Birgit Kammlander, Yang Lu, Rahul Mahavir Varma, Qichun Gu, Karen Radetzky, Thomas A. Selby, Tianjun Liu, Stefania Riva, Zimu Wei, Tien-Lin Lee, Jonathan Rawle, Håkan Rensmo, Miguel Anaya, Ute B. Cappel, Samuel D. Stranks

ACS Energy Letters· Volume 10· Issue 7
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Source abstract

Abstract

To commercialize lead halide perovskites as light-emitting diodes (LEDs), the operational device lifetime needs to be drastically improved. For this to be achieved, an understanding of degradation behavior under bias is crucial. Herein, we perform operando measurements of the structural, chemical, and electronic changes using synchrotron-based grazing-incidence wide-angle X-ray scattering and hard X-ray photoelectron spectroscopy on full-stack deep blue mixed bromide/chloride lead halide perovskite LEDs. While a clear drop in optoelectronic performance is recorded under electrical bias, the accompanying X-ray scattering data reveals only minor changes in structural properties. However, photoelectron spectroscopy reveals substantial chemical changes at the electron-injecting interface after bias is applied, including the formation of unwanted metallic lead and a new chlorine species that is not in the perovskite structure. These operando approaches give important structural and interfacial perspectives to reveal the degradation mechanisms in these LEDs and highlight the need to address the top electron-injecting interface to realize step-changes in operational stability.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties

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

Affiliations

Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.

Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K.

Division of X-ray Photon Science, Department of Physics and Astronomy

Uppsala University

Wallenberg Initiative Materials Science for Sustainability, Department of Physics and Astronomy

Diamond Light Source, Harwell Science and Innovation Campus

Departamento de Fisica de la Materia Condensada, Instituto de Ciencia de Materiales de Sevilla, Universidad de Sevilla-CSIC, Avenida Reina Mercedes SN, Sevilla 41012, Spain

Funding

Engineering and Physical Sciences Research Council · Royal Society · Royal Academy of Engineering · Vetenskapsrådet · Energimyndigheten · Ministerio de Ciencia, Innovación y Universidades · Göran Gustafssons Stiftelser · Knut och Alice Wallenbergs Stiftelse · NextGenerationEU · H2020 European Research Council · Drisaldi Mitra Palestra Foundation

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