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Colloidal synthesis and optical properties of perovskite-inspired cesium zirconium halide nanocrystals

DOI: 10.1021/acsmaterialslett.0c00393 DOI Help

Authors: Anna Abfalterer (University of Cambridge) , Javad Shamsi (University of Cambridge) , Dominik J. Kubicki (University of Cambridge) , Christopher N. Savory (University College London) , James Xiao (University of Cambridge) , Giorgio Divitini (University of Cambridge) , Weiwei Li (University of Cambridge) , Stuart Macpherson (University of Cambridge) , Krzysztof GaƂkowski (University of Cambridge; Nicolaus Copernicus University) , Judith L. Macmanus-Driscoll (University of Cambridge) , David O. Scanlon (University College London; Diamond Light Source) , Samuel D. Stranks (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Materials Letters

State: Published (Approved)
Published: November 2020

Open Access Open Access

Abstract: Optoelectronic devices based on lead halide perovskites are processed in facile ways, yet are remarkably efficient. There are extensive research efforts investigating lead-free perovskite and perovskite-related compounds, yet there are challenges to synthesize these materials in forms that can be directly integrated into thin film devices rather than as bulk powders. Here, we report on the colloidal synthesis and characterization of lead-free, antifluorite Cs2ZrX6 (X = Cl, Br) nanocrystals that are readily processed into thin films. We use transmission electron microscopy and powder X-ray diffraction measurements to determine their size and structural properties, and solid-state nuclear magnetic resonance measurements reveal the presence of oleate ligand, together with a disordered distribution of Cs surface sites. Density functional theory calculations reveal the band structure and fundamental band gaps of 5.06 and 3.91 eV for Cs2ZrCl6 and Cs2ZrBr6, respectively, consistent with experimental values. Finally, we demonstrate that the Cs2ZrCl6 and Cs2ZrBr6 nanocrystal thin films exhibit tunable, broad white photoluminescence with quantum yields of 45% for the latter, with respective peaks in the blue and green spectral regions and mixed systems exhibiting properties between them. Our work represents a critical step toward the application of lead-free Cs2ZrX6 nanocrystal thin films into next-generation light-emitting applications.

Journal Keywords: Thin films; Absorption; Physical and chemical processes; Transmission electron microscopy

Subject Areas: Materials, Physics

Technical Areas:

Added On: 16/11/2020 08:58


Discipline Tags:

Materials Science Metallurgy Perovskites Physics Electronics Nanoscience/Nanotechnology Surfaces interfaces and thin films

Technical Tags: