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Martinez-Tomas MC, Klymov O, Shimazoe K, Sánchez-Royo JF, Changarath ME, Agouram S, Muñoz-Sanjosé V. Elastic and inelastic strain in submicron-thick ZnO epilayers grown on r-sapphire substrates by metal-organic vapour phase deposition. Acta Crystallogr B Struct Sci Cryst Eng Mater 2024; 80:72-83. [PMID: 38354070 PMCID: PMC10994167 DOI: 10.1107/s2052520624000441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Accepted: 01/11/2024] [Indexed: 02/16/2024]
Abstract
A significant part of the present and future of optoelectronic devices lies on thin multilayer heterostructures. Their optical properties depend strongly on strain, being essential to the knowledge of the stress level to optimize the growth process. Here the structural and microstructural characteristics of sub-micron a-ZnO epilayers (12 to 770 nm) grown on r-sapphire by metal-organic chemical vapour deposition are studied. Morphological and structural studies have been made using scanning electron microscopy and high-resolution X-ray diffraction. Plastic unit-cell distortion and corresponding strain have been determined as a function of film thickness. A critical thickness has been observed as separating the non-elastic/elastic states with an experimental value of 150-200 nm. This behaviour has been confirmed from ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy measurements. An equation that gives the balance of strains is proposed as an interesting method to experimentally determine this critical thickness. It is concluded that in the thinnest films an elongation of the Zn-O bond takes place and that the plastic strained ZnO films relax through nucleation of misfit dislocations, which is a consequence of three-dimensional surface morphology.
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Affiliation(s)
- Maria Carmen Martinez-Tomas
- Fisica Aplicada y Electromagnetismo, Universidad de Valencia, Dr. Moliner 50, Burjassot, Valencia 46100, Spain
| | - Oleksii Klymov
- Fisica Aplicada y Electromagnetismo, Universidad de Valencia, Dr. Moliner 50, Burjassot, Valencia 46100, Spain
| | - Kazuki Shimazoe
- Department of Electronics, Kyoto Institute of Technology, Matsugasaki, Sakyo-Ku, Kyoto, 606-8585, Japan
| | | | | | - Said Agouram
- Fisica Aplicada y Electromagnetismo, Universidad de Valencia, Dr. Moliner 50, Burjassot, Valencia 46100, Spain
| | - Vicente Muñoz-Sanjosé
- Fisica Aplicada y Electromagnetismo, Universidad de Valencia, Dr. Moliner 50, Burjassot, Valencia 46100, Spain
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Canet-Albiach R, Kreĉmarová M, Bailach JB, Gualdrón-Reyes AF, Rodríguez-Romero J, Gorji S, Pashaei-Adl H, Mora-Seró I, Martínez Pastor JP, Sánchez-Royo JF, Muñoz-Matutano G. Revealing Giant Exciton Fine-Structure Splitting in Two-Dimensional Perovskites Using van der Waals Passivation. Nano Lett 2022; 22:7621-7627. [PMID: 36074722 DOI: 10.1021/acs.nanolett.2c02729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Organic-inorganic layered perovskites are currently some of the most promising 2D van der Waals materials. Low crystal quality usually broadens the exciton line width, obscuring the fine structure of the exciton in conventional photoluminescence experiments. Here, we propose a mechanical approach to reducing the effect of spectral diffusion by means of hBN capping on layered perovskites, revealing the exciton fine structure. We used a stochastic model to link the reduction of the spectral line width with the population of charge fluctuation centers present in the organic spacer. van der Waals forces between both lattices cause the partial clamping of the perovskite organic spacer molecules, and hence the amplitude of the overall spectral diffusion effect is reduced. Our work provides a low-cost solution to the problem of accessing important fine-structure excitonic state information, along with an explanation of the important carrier dynamics present in the organic spacer that affect the quality of the optical emission.
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Affiliation(s)
- Rodolfo Canet-Albiach
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - Marie Kreĉmarová
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - José Bosch Bailach
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - Andrés F Gualdrón-Reyes
- Institute of Advanced Materials (INAM), Universitat Jaume I, Avenida de Vicent Sos Baynat s/n, 12071 Castelló de la Plana, Spain
- Facultad de Ciencias, Instituto de Ciencias Químicas, Isla Teja, Universidad Austral de Chile, 5090000 Valdivia, Chile
| | - Jesús Rodríguez-Romero
- Institute of Advanced Materials (INAM), Universitat Jaume I, Avenida de Vicent Sos Baynat s/n, 12071 Castelló de la Plana, Spain
- Facultad de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, C.U., Coyoacán, 04510 Mexico City, Mexico
| | - Setatira Gorji
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - Hamid Pashaei-Adl
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
| | - Iván Mora-Seró
- Institute of Advanced Materials (INAM), Universitat Jaume I, Avenida de Vicent Sos Baynat s/n, 12071 Castelló de la Plana, Spain
| | - Juan P Martínez Pastor
- Instituto de Ciencia de Materiales, Universidad de Valencia (ICMUV), 46071 Valencia, Spain
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Brotons-Gisbert M, Andres-Penares D, Martínez-Pastor JP, Cros A, Sánchez-Royo JF. Optical contrast of 2D InSe on SiO 2/Si and transparent substrates using bandpass filters. Nanotechnology 2017; 28:115706. [PMID: 28117306 DOI: 10.1088/1361-6528/aa5bb1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The particular optical and electronic properties recently reported for 2D InSe depict this 2D material as being very versatile for future electronic and optoelectronic devices with tunable and optimized functionalities. For its fundamental study and the development of practical applications, rapid and accurate identification methods of atomically thin InSe are essential. Here, we demonstrate an enhancement of the optical contrast between InSe nanosheets and the underlying SiO2/Si substrate by illuminating with a 40 nm wide bandpass filter centered at 500 nm. Moreover, we study the optical contrast of 2D InSe on transparent substrates. Our results suggest that a good optical contrast is achieved for transparent substrates with low real refractive indices such as LiF or a viscoelastic polydimethylsiloxane stamp. In this case, an optimum optical contrast would be achieved by using a bandpass filter centered at 450 nm. These results can be very useful for speeding up the continuously growing research on 2D InSe and its applications.
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Martí A, Costero AM, Gaviña P, Gil S, Parra M, Brotons-Gisbert M, Sánchez-Royo JF. Functionalized Gold Nanoparticles as an Approach to the Direct Colorimetric Detection of DCNP Nerve Agent Simulant. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300339] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Bosch-Navarro C, Coronado E, Martí-Gastaldo C, Sánchez-Royo JF, Gómez MG. Influence of the pH on the synthesis of reduced graphene oxide under hydrothermal conditions. Nanoscale 2012; 4:3977-82. [PMID: 22653666 DOI: 10.1039/c2nr30605k] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Here we describe the important role played by the pH on the morphology and structure of the reduced graphite oxide (rGO) samples obtained by hydrothermal treatment of the previously prepared GO. The nature of the resulting samples has been studied on the basis of a complete battery of experimental techniques.
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Affiliation(s)
- Concha Bosch-Navarro
- Instituto de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán-2, 46980 Paterna, Spain.
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