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Granada-Ramirez DA, Arias-Cerón JS, Pérez-González M, Luna-Arias JP, Cruz-Orea A, Rodríguez-Fragoso P, Herrera-Pérez JL, Gómez-Herrera ML, Tomás SA, Vázquez-Hernández F, Durán-Ledezma AA, Mendoza-Alvarez JG. Chemical synthesis and optical, structural, and surface characterization of InP-In 2O 3 quantum dots. APPLIED SURFACE SCIENCE 2020; 530:147294. [PMID: 32834267 DOI: 10.1016/j.apsusc.2020.147224] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 06/11/2020] [Accepted: 07/15/2020] [Indexed: 05/24/2023]
Abstract
InP-In2O3 colloidal quantum dots (QDs) synthesized by a single-step chemical method without injection of hot precursors (one-pot) were investigated. Specifically, the effect of the tris(trimethylsilyl)phosphine, P(TMS)3, precursor concentration on the QDs properties was studied to effectively control the size and shape of the samples with a minimum size dispersion. The effect of the P(TMS)3 precursor concentration on the optical, structural, chemical surface, and electronic properties of InP-In2O3 QDs is discussed. The absorption spectra of InP-In2O3 colloids, obtained by both UV-Vis spectrophotometry and photoacoustic spectroscopy, showed a red-shift in the high-energy regime as the concentration of the P(TMS)3 increased. In addition, these results were used to determine the band-gap energy of the InP-In2O3 nanoparticles, which changed between 2.0 and 2.9 eV. This was confirmed by Photoluminescence spectroscopy, where a broad-band emission displayed from 2.0 to 2.9 eV is associated with the excitonic transition of the InP and In2O3 QDs. In2O3 and InP QDs with diameters ranging approximately from 8 to 10 nm and 6 to 9 nm were respectively found by HR-TEM. The formation of the InP and In2O3 phases was confirmed by X-ray Photoelectron Spectroscopy.
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Affiliation(s)
- D A Granada-Ramirez
- Departamento de Física, Cinvestav-IPN, Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 Ciudad de México, Mexico
| | - J S Arias-Cerón
- Cátedra CONACYT-Departamento de Ingeniería Eléctrica, Sección de Electrónica del Estado Sólido, Cinvestav-IPN, Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 Ciudad de México, Mexico
| | - M Pérez-González
- Área Académica de Matemáticas y Física, Instituto de Ciencias Básicas e Ingeniería, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km. 4.5, Col. Carboneras, C.P. 42184, Mineral de la Reforma, Hidalgo, Mexico
- Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas del I.P.N., Av. Instituto Politécnico Nacional, Col. San Pedro Zacatenco, C.P. 07340 Ciudad de México, Mexico
| | - J P Luna-Arias
- Departamento de Biología Celular, Cinvestav-IPN, Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 Ciudad de México, Mexico
- Programa de Doctorado de Nanociencias y Nanotecnología, Cinvestav-IPN, Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 Ciudad de México, Mexico
| | - A Cruz-Orea
- Departamento de Física, Cinvestav-IPN, Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 Ciudad de México, Mexico
| | - P Rodríguez-Fragoso
- Departamento de Física, Cinvestav-IPN, Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 Ciudad de México, Mexico
| | - J L Herrera-Pérez
- Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas del I.P.N., Av. Instituto Politécnico Nacional, Col. San Pedro Zacatenco, C.P. 07340 Ciudad de México, Mexico
| | - M L Gómez-Herrera
- Facultad de Ingeniería, Universidad Autónoma de Querétaro, Centro Universitario, Cerro de las Campanas S/N, C.P. 76010 Santiago de Querétaro, Querétaro, Mexico
| | - S A Tomás
- Departamento de Física, Cinvestav-IPN, Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 Ciudad de México, Mexico
| | - F Vázquez-Hernández
- Universidad del Ejército y Fuerza Aérea, Escuela Militar de Ingenieros, Av. Industria Militar 261, Campo Militar No. 1-K, Lomas de San Isidro, Naucalpan, Edo. de México, Mexico
- Universidad Autónoma de la Ciudad de México, Av. La Corona 320, Col. Loma de la Palma, C.P. 07160 Ciudad de México, Mexico
| | - A A Durán-Ledezma
- Escuela Superior de Cómputo, Instituto Politécnico Nacional, Av. Juan de Dios Bátiz, esq. Av. Miguel Othón de Mendizábal, Col. Lindavista, Delegación Gustavo A. Madero, C.P. 07738 Ciudad de México, Mexico
| | - J G Mendoza-Alvarez
- Departamento de Física, Cinvestav-IPN, Av. Instituto Politécnico Nacional 2508, Col. San Pedro Zacatenco, C.P. 07360 Ciudad de México, Mexico
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Cai T, Li F, Jiang Y, Liu X, Xia X, Wang X, Peng J, Wang L, Daoud WA. In situ inclusion of thiocyanate for highly luminescent and stable CH 3NH 3PbBr 3 perovskite nanocrystals. NANOSCALE 2019; 11:1319-1325. [PMID: 30604813 DOI: 10.1039/c8nr07987k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this work, an in situ thiocyanate inclusion method for the fabrication of highly luminescent and stable CH3NH3PbBr3 perovskite nanocrystals (NCs) is developed, employing Pb(SCN)2 as the lead precursor to partially or totally replace PbBr2 in the ligand-assisted reprecipitation (LARP) process. The in situ approach not only avoids the introduction of impurity elements, but also more interestingly incorporation of thiocyanate can control the crystallinity, particle size, luminescence and stability of CH3NH3PbBr3 NCs in a simple and effective manner. By adjusting the thiocyanate concentration, the photoluminescence (PL) of the synthesized CH3NH3PbBr3 NCs can be tuned in a range of 473-526 nm, as characterized by narrow emission line widths of 21-28 nm and outstanding photoluminescence quantum yields (PLQYs) of 73% to 96%. Meanwhile, the stability of CH3NH3PbBr3 NCs can be greatly improved as the amount of thiocyanate increases. The improvement in the optical performance and stability of CH3NH3PbBr3 NCs is mainly due to the contribution of higher crystallinity and, more stable and defect-free surface passivation induced by the presence of thiocyanate. This work paves a novel way for preparing highly luminescent and stable CH3NH3PbBr3 NCs.
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Affiliation(s)
- Tao Cai
- Department of Materials Science and Engineering, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.
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Milosavljević AR, Božanić DK, Sadhu S, Vukmirović N, Dojčilović R, Sapkota P, Huang W, Bozek J, Nicolas C, Nahon L, Ptasinska S. Electronic Properties of Free-Standing Surfactant-Capped Lead Halide Perovskite Nanocrystals Isolated in Vacuo. J Phys Chem Lett 2018; 9:3604-3611. [PMID: 29902010 DOI: 10.1021/acs.jpclett.8b01466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We report an investigation of lead halide perovskite CH3NH3PbBr3 nanocrystals and associated ligand molecules by combining several different state-of-the-art experimental techniques, including synchrotron radiation-based XPS and VUV PES of free-standing nanocrystals isolated in vacuum. By using this novel approach for perovskite materials, we could directly obtain complete band alignment to vacuum of both CH3NH3PbBr3 nanocrystals and the ligands widely used in their preparation. We discuss the possible influence of the ligand molecules to apparent perovskite properties, and we compare the electronic properties of nanocrystals to those of bulk material. The experimental results were supported by DFT calculations.
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Affiliation(s)
| | - Dušan K Božanić
- Synchrotron SOLEIL, l'Orme des Merisiers , Saint Aubin , BP48, 91192 Gif sur Yvette Cedex, France
- Vinča Institute of Nuclear Sciences , University of Belgrade , P.O. Box 522, 11001 Belgrade , Serbia
| | - Subha Sadhu
- Radiation Laboratory , University of Notre Dame , Notre Dame , Indiana 46556 , United States
| | - Nenad Vukmirović
- Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade , University of Belgrade , Pregrevica 118 , 11080 Belgrade , Serbia
| | - Radovan Dojčilović
- Vinča Institute of Nuclear Sciences , University of Belgrade , P.O. Box 522, 11001 Belgrade , Serbia
| | - Pitambar Sapkota
- Radiation Laboratory , University of Notre Dame , Notre Dame , Indiana 46556 , United States
- Department of Physics , University of Notre Dame , Notre Dame , Indiana 46556 , United States
| | - Weixin Huang
- Radiation Laboratory , University of Notre Dame , Notre Dame , Indiana 46556 , United States
| | - John Bozek
- Synchrotron SOLEIL, l'Orme des Merisiers , Saint Aubin , BP48, 91192 Gif sur Yvette Cedex, France
| | - Christophe Nicolas
- Synchrotron SOLEIL, l'Orme des Merisiers , Saint Aubin , BP48, 91192 Gif sur Yvette Cedex, France
| | - Laurent Nahon
- Synchrotron SOLEIL, l'Orme des Merisiers , Saint Aubin , BP48, 91192 Gif sur Yvette Cedex, France
| | - Sylwia Ptasinska
- Radiation Laboratory , University of Notre Dame , Notre Dame , Indiana 46556 , United States
- Department of Physics , University of Notre Dame , Notre Dame , Indiana 46556 , United States
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