DataVXACS Energy LettersPaper
journal article·2022-12-09Open access

The Origin of Broad Emission in ⟨100⟩ Two-Dimensional Perovskites: Extrinsic vs Intrinsic Processes

Simon Kahmann, Daniele Meggiolaro, Luca Gregori, Eelco K. Tekelenburg, Matteo Pitaro, Samuel D. Stranks, Filippo De Angelis, Maria A. Loi

ACS Energy Letters· Volume 7· Issue 12
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Source abstract

Abstract

2D metal halide perovskites can show narrow and broad emission bands (BEs), and the latter's origin is hotly debated. A widespread opinion assigns BEs to the recombination of intrinsic self-trapped excitons (STEs), whereas recent studies indicate they can have an extrinsic defect-related origin. Here, we carry out a combined experimental-computational study into the microscopic origin of BEs for a series of prototypical phenylethylammonium-based 2D perovskites, comprising different metals (Pb, Sn) and halides (I, Br, Cl). Photoluminescence spectroscopy reveals that all of the compounds exhibit BEs. Where not observable at room temperature, the BE signature emerges upon cooling. By means of DFT calculations, we demonstrate that emission from halide vacancies is compatible with the experimentally observed features. Emission from STEs may only contribute to the BE in the wide-band-gap Br- and Cl-based compounds. Our work paves the way toward a complete understanding of broad emission bands in halide perovskites that will facilitate the fabrication of efficient narrow and white light emitting devices.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · 2D Materials and Applications · Solid-state spectroscopy and crystallography

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

Affiliations

Photophysics and OptoElectronics Group, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

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

Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), Istituto CNR di Scienze e Tecnologie Chimiche (SCITEC−CNR), Via Elce di Sotto 8, 06123 Perugia, Italy

Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy

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

Department of Natural Sciences & Mathematics, College of Sciences & Human Studies, Prince Mohammad Bin Fahd University, Dhahran 34754, Saudi Arabia

Funding

Deutscher Akademischer Austauschdienst · Nederlandse Organisatie voor Wetenschappelijk Onderzoek

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