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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Double Perovskite Single-Crystal Photoluminescence Quenching and Resurge: The Role of Cu Doping on its Photophysics and Crystal Structure

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Author(s):
Ito, Bruno I. [1] ; Tekelenburg, Eelco K. [2] ; Blake, Graeme R. [2] ; Loi, Maria A. [2] ; Nogueira, Ana Flavia [1]
Total Authors: 5
Affiliation:
[1] Univ Estadual Campinas, Chem Inst, Lab Nanotecnol & Energia Solar, BR-13083970 Campinas, SP - Brazil
[2] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen - Netherlands
Total Affiliations: 2
Document type: Journal article
Source: Journal of Physical Chemistry Letters; v. 12, n. 42, p. 10444-10449, OCT 28 2021.
Web of Science Citations: 0
Abstract

Cs2AgBiBr6 is a potential lead-free double perovskite candidate for optoelectronic applications; however, its large and indirect band gap imposes limitations. Here, single crystals of Cs2AgBiBr6 are doped with Cu2+ cations to increase the absorption range from the visible region up to 0.5 eV in the near-infrared region. Inductively coupled plasma spectroscopy confirms the presence of 1.9% of copper in the Cs2AgBiBr6 structure. Structural and optical changes caused by Cu doping were studied by Raman spectroscopy combined with X-ray diffraction, heat capacity. measurements, and low-temperature photoluminescence spectroscopy. Along with the 1.9 eV emission typical of the pristine Cs2AgBiBr6 single crystals, we report a novel low-energy emission at 0.9 eV related to deep defects. In the doped crystals, these peaks are quenched, and a new emission band at 1.3 eV is visible. This new emission band appears only above 120 K, showing that thermal energy is necessary to trigger the copper-related emission. (AU)

FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
Grantee:Ana Flávia Nogueira
Support Opportunities: Research Grants - Research Centers in Engineering Program