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Ghasemi M, Li X, Tang C, Li Q, Lu J, Du A, Lee J, Appadoo D, Tizei LHG, Pham ST, Wang L, Collins SM, Hou J, Jia B, Wen X. Effective Suppressing Phase Segregation of Mixed-Halide Perovskite by Glassy Metal-Organic Frameworks. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023:e2304236. [PMID: 37616513 DOI: 10.1002/smll.202304236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 08/13/2023] [Indexed: 08/26/2023]
Abstract
Lead mixed-halide perovskites offer tunable bandgaps for optoelectronic applications, but illumination-induced phase segregation can quickly lead to changes in their crystal structure, bandgaps, and optoelectronic properties, especially for the Br-I mixed system because CsPbI3 tends to form a non-perovskite phase under ambient conditions. These behaviors can impact their performance in practical applications. By embedding such mixed-halide perovskites in a glassy metal-organic framework, a family of stable nanocomposites with tunable emission is created. Combining cathodoluminescence with elemental mapping under a transmission electron microscope, this research identifies a direct relationship between the halide composition and emission energy at the nanoscale. The composite effectively inhibits halide ion migration, and consequently, phase segregation even under high-energy illumination. The detailed mechanism, studied using a combination of spectroscopic characterizations and theoretical modeling, shows that the interfacial binding, instead of the nanoconfinement effect, is the main contributor to the inhibition of phase segregation. These findings pave the way to suppress the phase segregation in mixed-halide perovskites toward stable and high-performance optoelectronics.
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Affiliation(s)
- Mehri Ghasemi
- School of Science, RMIT University, Melbourne, VIC, 3000, Australia
| | - Xuemei Li
- School of Chemical Engineering, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Cheng Tang
- School of Chemistry and Physics, Centre for Materials Science, Queensland University of Technology, 2 George St, Brisbane City, QLD, 4001, Australia
| | - Qi Li
- Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Junlin Lu
- Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Aijun Du
- School of Chemistry and Physics, Centre for Materials Science, Queensland University of Technology, 2 George St, Brisbane City, QLD, 4001, Australia
| | - Jaeho Lee
- School of Chemical Engineering, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Dominique Appadoo
- Australian Synchrotron, 800 Blackburn Rd, Clayton, VIC, 3168, Australia
| | - Luiz H G Tizei
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France
| | - Sang T Pham
- Bragg Centre for Materials Research, School of Chemical and Process Engineering and School of Chemistry, University of Leeds, LS2 9JT, Leeds, UK
| | - Lianzhou Wang
- School of Chemical Engineering, The University of Queensland, St. Lucia, QLD, 4072, Australia
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Sean M Collins
- Bragg Centre for Materials Research, School of Chemical and Process Engineering and School of Chemistry, University of Leeds, LS2 9JT, Leeds, UK
| | - Jingwei Hou
- School of Chemical Engineering, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Baohua Jia
- School of Science, RMIT University, Melbourne, VIC, 3000, Australia
| | - Xiaoming Wen
- School of Science, RMIT University, Melbourne, VIC, 3000, Australia
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Hourdakis E, Bardakas A, Segkos A, Tsilivaki S, Gardelis S, Tsamis C. Tunable and white light photoluminescence from ZnO on porous Si with the addition of carbon quantum dots. NANOTECHNOLOGY 2023; 34:455202. [PMID: 37536299 DOI: 10.1088/1361-6528/aced0f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 08/03/2023] [Indexed: 08/05/2023]
Abstract
In this work we demonstrate a two-pixel solid-state photoluminescent device able to emit white light covering the entire visible spectrum from 380 nm up to 800 nm. The device is based on a combination of porous Si, hydrothermally grown ZnO and carbon quantum dots, in a two-pixel formation, with porous Si and ZnO acting independently while the carbon quantum dots are deposited on top of the entire device. All processing is done using standard Si processing techniques. Moreover, the device design allows for tunability of the emitted spectrum simply by choosing the desired combination of the materials. Overall, the demonstrated device is low cost, environmentally safe and biocompatible.
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Affiliation(s)
- E Hourdakis
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
| | - A Bardakas
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
| | - A Segkos
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
| | - S Tsilivaki
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
- Department of Physics, National Kapodistrian University of Athens, Athens, Greece
| | - S Gardelis
- Department of Physics, National Kapodistrian University of Athens, Athens, Greece
| | - C Tsamis
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
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Wang B, He JH, Yu B, He X, Xue F. Piezoelectricity-modulated optical recombination dynamics of monolayer-MoS 2/GaN-film heterostructures. NANOSCALE 2023; 15:2036-2043. [PMID: 36520146 DOI: 10.1039/d2nr05850b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Dynamic manipulation of optoelectronic responses by mechanical stimuli is promising for developing wearable electronics and human-machine interfacing. Although 2D-3D hybrid heterostructures can bring advancements in optoelectronics, their dynamic optical responses to external strains remain rarely studied. Here, we demonstrate the strain-tuned recombination dynamics of monolayer-MoS2 and thin-film-GaN heterostructures. We find that optical excitons in the heterostructures, apart from trions, can be markedly modulated by strains. We argue that MoS2 piezoelectric dipoles across the interfaces lead to curved band diagrams, in which optical excitons dissociate into spatially separated quasi-particles and concurrently relocate to the maxima of valence bands and the minima of conduction bands. With the increase in tensile strains, the photoluminescence (PL) intensity of the heterostructures shows quenched responses. Noticeably, the change in PL spectra strongly depends on the directions of the applied strains because of the lateral piezoelectric periodicity of MoS2 flakes. This work not only helps in understanding the underlying physics of the decreased PL intensities upon applying strains but also demonstrates a feasible way (i.e., strains) to manipulate the PL efficiency of 2D-material-based optoelectronics.
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Affiliation(s)
- Baoyu Wang
- ZJU-Hangzhou Global Scientific and Technological Innovation Center, School of Micro-Nano Electronics, Zhejiang University, Hangzhou 310020, China.
| | - Jr-Hau He
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, China
| | - Bin Yu
- ZJU-Hangzhou Global Scientific and Technological Innovation Center, School of Micro-Nano Electronics, Zhejiang University, Hangzhou 310020, China.
| | - Xin He
- ZJU-Hangzhou Global Scientific and Technological Innovation Center, School of Micro-Nano Electronics, Zhejiang University, Hangzhou 310020, China.
| | - Fei Xue
- ZJU-Hangzhou Global Scientific and Technological Innovation Center, School of Micro-Nano Electronics, Zhejiang University, Hangzhou 310020, China.
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Lin T, Zhou ZY, Huang YM, Yang K, Zhang BJ, Feng ZC. Strain-Controlled Recombination in InGaN/GaN Multiple Quantum Wells on Silicon Substrates. NANOSCALE RESEARCH LETTERS 2018; 13:243. [PMID: 30136130 PMCID: PMC6104412 DOI: 10.1186/s11671-018-2663-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 08/09/2018] [Indexed: 06/08/2023]
Abstract
This paper reports the photoluminescence (PL) properties of InGaN/GaN multiple quantum well (MQW) light-emitting diodes grown on silicon substrates which were designed with different tensile stress controlling architecture like periodic Si δ-doping to the n-type GaN layer or inserting InGaN/AlGaN layer for investigating the strain-controlled recombination mechanism in the system. PL results turned out that tensile stress released samples had better PL performances as their external quantum efficiencies increased to 17%, 7 times larger than the one of regular sample. Detail analysis confirmed they had smaller nonradiative recombination rates ((2.5~2.8)×10-2 s-1 compared to (3.6~4.7)× 10-2 s-1), which was associated with the better crystalline quality and absence of dislocations or cracks. Furthermore, their radiative recombination rates were found more stable and were much higher ((5.7~5.8) ×10-3 s-1 compared to [9~7] ×10-4 s-1) at room temperature. This was ascribed to the suppression of shallow localized states on MQW interfaces, leaving the deep radiative localization centers inside InGaN layers dominating the radiative recombination.
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Affiliation(s)
- Tao Lin
- School of Physical Science and Technology, Laboratory of Optoelectronic Materials and Detection Technology, Guangxi Key Laboratory for Relativistic Astrophysics,, Guangxi University, Nanning, 530004 China
| | - Zhi Yan Zhou
- School of Physical Science and Technology, Laboratory of Optoelectronic Materials and Detection Technology, Guangxi Key Laboratory for Relativistic Astrophysics,, Guangxi University, Nanning, 530004 China
| | - Yao Min Huang
- School of Physical Science and Technology, Laboratory of Optoelectronic Materials and Detection Technology, Guangxi Key Laboratory for Relativistic Astrophysics,, Guangxi University, Nanning, 530004 China
| | - Kun Yang
- School of Physical Science and Technology, Laboratory of Optoelectronic Materials and Detection Technology, Guangxi Key Laboratory for Relativistic Astrophysics,, Guangxi University, Nanning, 530004 China
| | - Bai Jun Zhang
- School of Electronics and Information Technology, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou, 510275 China
| | - Zhe Chuan Feng
- School of Physical Science and Technology, Laboratory of Optoelectronic Materials and Detection Technology, Guangxi Key Laboratory for Relativistic Astrophysics,, Guangxi University, Nanning, 530004 China
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