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

Autor(es)

Ito, Bruno I. ^[1] ; Tekelenburg, Eelco K. ^[2] ; Blake, Graeme R. ^[2] ; Loi, Maria A. ^[2] ; Nogueira, Ana Flavia ^[1]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry Letters; v. 12, n. 42, p. 10444-10449, OCT 28 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia