1
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Chen B, Fan L, Li C, Xia L, Wang K, Wang J, Pang D, Zhu Z, Ma P. Au nanoparticles decorated β-Bi 2O 3 as highly-sensitive SERS substrate for detection of methylene blue and methyl orange. Analyst 2024; 149:4283-4294. [PMID: 38984809 DOI: 10.1039/d4an00633j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
In this work, Au/Bi2O3 was synthesized by loading Au nanoparticles (NPs) onto β-Bi2O3 by a simple solution reduction method. β-Bi2O3 was synthesized by a precipitation-thermal decomposition procedure, which results in significantly improved SERS detection limits down to 10-9 M for methylene blue (MB) and 10-7 M for methyl orange (MO) as probe molecules, comparable to those reported for the best semiconductor SERS substrates. In particular, further deposition of Au NPs (5.20% wt%) onto β-Bi2O3 results in a two-order-of-magnitude enhancement in detection sensitivity, achieving a detection limit of 10-11 M for MB and 10-9 M for MO. Under ultraviolet/visible irradiation, the Au/Bi2O3 hybrids substrate exhibits superior self-cleaning ability due to its photocatalytic degradation ability which can be applied repeatedly to the detection of pollutants. The advanced composite substrate simultaneously achieved ultra-low mass loading of Au NPs, outstanding detection performance, good reproducibility, high stability and self-cleaning ability. The development strategy of low load noble metal coupled high performance semiconductor β-Bi2O3 to obtain nano-hybrid materials provides a method to balance SERS sensitivity, cost effectiveness and operational stability, and can be synthesized in large quantities, which is a key step towards commercialization and has good reliability prospects.
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Affiliation(s)
- Binbin Chen
- Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, China.
| | - Lizhu Fan
- National Key Laboratory of Integrated Circuits and Microsystems, Chongqing 401332, China
| | - Chunyu Li
- Institute of Physical chemistry, Friedrich Schiller University Jena, 407743 Helmholtzweg, Germany
| | - Lu Xia
- Faculty of Mechanical Engineering, RWTH Aachen University, 52062 Aachen, Germany
| | - Kaiwen Wang
- Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, China.
| | - Jinshu Wang
- School of Public Health and Health Sciences, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Dawei Pang
- Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, China.
| | - Zhouhao Zhu
- College of Physics and Centre of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China.
| | - Peijie Ma
- Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, China.
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2
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Gong M, Dong Y, Zhu M, Qin F, Wang T, Shah FU, An R. Cation Chain Length of Nonhalogenated Ionic Liquids Matters in Enhancing SERS of Cytochrome c on Zr-Al-Co-O Nanotube Arrays. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:8886-8896. [PMID: 38622867 DOI: 10.1021/acs.langmuir.4c00067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Surface-enhanced Raman scattering (SERS) is a remarkably powerful analytical technique enabling trace-level detection of biological molecules. The interaction of a probe molecule with the SERS substrate shows important distinctions in the SERS spectra, providing inherent fingerprint information on the probe molecule. Herein, nonhalogenated phosphonium-based ionic liquids (ILs) containing cations with varying chain lengths were used as trace additives to amplify the interaction between the cytochrome c (Cyt c) and Zr-Al-Co-O (ZACO) nanotube arrays, strengthening the SERS signals. An increased enhancement factor (EF) by 2.5-41.2 times compared with the system without ILs was achieved. The improvement of the SERS sensitivity with the introduction of these ILs is strongly dependent on the cation chain length, in which the increasing magnitude of EF is more pronounced in the system with a longer alkyl chain length on the cation. Comparing the interaction forces measured by Cyt c-grafted atomic force microscopy (AFM) probes on ZACO substrates with those predicted by the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, the van der Waals forces became increasingly dominant as the chain length of the cations increased, associated with stronger Cyt c-ZACO XDLVO interaction forces. The major contributing component, van der Waals force, stems from the longer cation chains of the IL, which act as a bridge to connect Cyt c and the ZACO substrate, promoting the anchoring of the Cyt c molecules onto the substrate, thereby benefiting SERS enhancement.
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Affiliation(s)
- Mian Gong
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yihui Dong
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Minghai Zhu
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Fengxiang Qin
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Tianchi Wang
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Faiz Ullah Shah
- Chemistry of Interfaces, Luleå University of Technology, 97187 Luleå, Sweden
| | - Rong An
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Chu F, Qu X, He Y, Li W, Chen X, Zheng Z, Yang M, Ru X, Peng F, Qu M, Zheng K, Xu X, Yan H, Zhang Y. Prediction of sub-pyramid texturing as the next step towards high efficiency silicon heterojunction solar cells. Nat Commun 2023; 14:3596. [PMID: 37328475 DOI: 10.1038/s41467-023-39342-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 06/08/2023] [Indexed: 06/18/2023] Open
Abstract
The interfacial morphology of crystalline silicon/hydrogenated amorphous silicon (c-Si/a-Si:H) is a key success factor to approach the theoretical efficiency of Si-based solar cells, especially Si heterojunction technology. The unexpected crystalline silicon epitaxial growth and interfacial nanotwins formation remain a challenging issue for silicon heterojunction technology. Here, we design a hybrid interface by tuning pyramid apex-angle to improve c-Si/a-Si:H interfacial morphology in silicon solar cells. The pyramid apex-angle (slightly smaller than 70.53°) consists of hybrid (111)0.9/(011)0.1 c-Si planes, rather than pure (111) planes in conventional texture pyramid. Employing microsecond-long low-temperature (500 K) molecular dynamic simulations, the hybrid (111)/(011) plane prevents from both c-Si epitaxial growth and nanotwin formation. More importantly, given there is not any additional industrial preparation process, the hybrid c-Si plane could improve c-Si/a-Si:H interfacial morphology for a-Si passivated contacts technique, and wide-applied for all silicon-based solar cells as well.
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Affiliation(s)
- Feihong Chu
- Faculty of Materials and Manufacturing, Faculty of Information Technology, Beijing University of Technology, Beijing, China
| | - Xianlin Qu
- Center for Microscopy and Analysis, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Yongcai He
- Faculty of Materials and Manufacturing, Faculty of Information Technology, Beijing University of Technology, Beijing, China
- LONGi Central R&D Institute, Xi'an, China
| | - Wenling Li
- Faculty of Materials and Manufacturing, Faculty of Information Technology, Beijing University of Technology, Beijing, China
| | - Xiaoqing Chen
- Faculty of Materials and Manufacturing, Faculty of Information Technology, Beijing University of Technology, Beijing, China
| | - Zilong Zheng
- Faculty of Materials and Manufacturing, Faculty of Information Technology, Beijing University of Technology, Beijing, China.
| | - Miao Yang
- LONGi Central R&D Institute, Xi'an, China
| | | | - Fuguo Peng
- LONGi Central R&D Institute, Xi'an, China
| | - Minghao Qu
- LONGi Central R&D Institute, Xi'an, China
| | - Kun Zheng
- Faculty of Materials and Manufacturing, Faculty of Information Technology, Beijing University of Technology, Beijing, China.
| | - Xixiang Xu
- LONGi Central R&D Institute, Xi'an, China.
| | - Hui Yan
- Faculty of Materials and Manufacturing, Faculty of Information Technology, Beijing University of Technology, Beijing, China
| | - Yongzhe Zhang
- Faculty of Materials and Manufacturing, Faculty of Information Technology, Beijing University of Technology, Beijing, China.
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Unruh D, Meidanshahi RV, Hansen C, Manzoor S, Bertoni MI, Goodnick SM, Zimanyi GT. From Femtoseconds to Gigaseconds: The SolDeg Platform for the Performance Degradation Analysis of Silicon Heterojunction Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2021; 13:32424-32434. [PMID: 34185509 DOI: 10.1021/acsami.1c04716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Heterojunction Si solar cells exhibit notable performance degradation. We modeled this degradation by electronic defects getting generated by thermal activation across energy barriers over time. To analyze the physics of this degradation, we developed the SolDeg platform to simulate the dynamics of electronic defect generation. First, femtosecond molecular dynamics simulations were performed to create a-Si/c-Si stacks, using the machine learning-based Gaussian approximation potential. Second, we created shocked clusters by a cluster blaster method. Third, the shocked clusters were analyzed to identify which of them supported electronic defects. Fourth, the distribution of energy barriers that control the generation of these electronic defects was determined. Fifth, an accelerated Monte Carlo method was developed to simulate the thermally activated time-dependent defect generation across the barriers. Our main conclusions are as follows. (1) The degradation of a-Si/c-Si heterojunction solar cells via defect generation is controlled by a broad distribution of energy barriers. (2) We developed the SolDeg platform to track the microscopic dynamics of defect generation across this wide barrier distribution and determined the time-dependent defect density N(t) from femtoseconds to gigaseconds, over 24 orders of magnitude in time. (3) We have shown that a stretched exponential analytical form can successfully describe the defect generation N(t) over at least 10 orders of magnitude in time. (4) We found that in relative terms, Voc degrades at a rate of 0.2%/year over the first year, slowing with advancing time. (5) We developed the time correspondence curve to calibrate and validate the accelerated testing of solar cells. We found a compellingly simple scaling relationship between accelerated and normal times tnormal ∝ taccelT(accel)/T(normal). (6) We also carried out experimental studies of defect generation in a-Si:H/c-Si stacks. We found a relatively high degradation rate at early times that slowed considerably at longer time scales.
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Affiliation(s)
- Davis Unruh
- Physics Department, University of California, Davis, Davis, California 95616, United States
| | - Reza Vatan Meidanshahi
- School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287-5706, United States
| | - Chase Hansen
- Physics Department, University of California, Davis, Davis, California 95616, United States
| | - Salman Manzoor
- School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287-5706, United States
| | - Mariana I Bertoni
- School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287-5706, United States
| | - Stephen M Goodnick
- School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287-5706, United States
| | - Gergely T Zimanyi
- Physics Department, University of California, Davis, Davis, California 95616, United States
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5
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Ma G, Jia B, Zhao D, Yang Z, Yu J, Liu J, Guo L. Amorphous Mn 3 O 4 Nanocages with High-Efficiency Charge Transfer for Enhancing Electro-Optic Properties of Liquid Crystals. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1805475. [PMID: 30977976 DOI: 10.1002/smll.201805475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 03/25/2019] [Indexed: 06/09/2023]
Abstract
Improving electro-optic properties is essential for fabricating high-quality liquid crystal displays. Herein, by doping amorphous Mn3 O4 octahedral nanocages (a-Mn3 O4 ONCs) into a nematic liquid crystal (NLC) matrix E7, outstanding electro-optic properties of the blend are successfully obtained. At a doping concentration of 0.03 wt%, the maximum decreases of threshold voltage (Vth ) and saturation voltage (Vsat ) are 34% and 31%, respectively, and the increase of contrast (Con ) is 160%. This remarkable electro-optic activity can be attributed to high-efficiency charge transfer within the a-Mn3 O4 ONCs NLC system, caused by metastable electronic states of a-Mn3 O4 ONCs. To the best of our knowledge, such remarkable decreased electro-optic activity is observed for the first time from doping amorphous semiconductors, which could provide a new pathway to develop excellent energy-saving amorphous materials and improve their potential applications in electro-optical devices.
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Affiliation(s)
- Guanshui Ma
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Binbin Jia
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Dongyu Zhao
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Zhao Yang
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Jian Yu
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Juzhe Liu
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
| | - Lin Guo
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China
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6
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Vatan Meidanshahi R, Bowden S, Goodnick SM. Electronic structure and localized states in amorphous Si and hydrogenated amorphous Si. Phys Chem Chem Phys 2019; 21:13248-13257. [DOI: 10.1039/c9cp01121h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Calculated DOS of a-Si:H close to the band gap for different H concentrations in the case of (a) thermodynamic and (b) kinetic H addition.
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Affiliation(s)
| | - Stuart Bowden
- Arizona State University
- School of Electrical
- Computer and Energy Engineering
- Tempe
- USA
| | - Stephen M. Goodnick
- Arizona State University
- School of Electrical
- Computer and Energy Engineering
- Tempe
- USA
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7
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Zhu C, Xu Q. Amorphous Materials for Enhanced Localized Surface Plasmon Resonances. Chem Asian J 2018; 13:730-739. [DOI: 10.1002/asia.201701722] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Chuanhui Zhu
- College of Materials Science & Engineering; Zhengzhou University; Zhengzhou 450052 P. R. China
| | - Qun Xu
- College of Materials Science & Engineering; Zhengzhou University; Zhengzhou 450052 P. R. China
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8
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Kislitsyn DA, Mills JM, Chiu SK, Taber BN, Barnes JD, Gervasi CF, Goforth AM, Nazin GV. Creation and Annihilation of Charge Traps in Silicon Nanocrystals: Experimental Visualization and Spectroscopy. J Phys Chem Lett 2018; 9:710-716. [PMID: 29365270 DOI: 10.1021/acs.jpclett.7b03299] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Recent studies have shown the presence of an amorphous surface layer in nominally crystalline silicon nanocrystals (SiNCs) produced by some of the most common synthetic techniques. The amorphous surface layer can serve as a source of deep charge traps, which can dramatically affect the electronic and photophysical properties of SiNCs. We present results of a scanning tunneling microscopy/scanning tunneling spectroscopy (STM/STS) study of individual intragap states observed on the surfaces of hydrogen-passivated SiNCs deposited on the Au(111) surface. STS measurements show that intragap states can be formed reversibly when appropriate voltage-current pulses are applied to individual SiNCs. Analysis of STS spectra suggests that the observed intragap states are formed via self-trapping of charge carriers injected into SiNCs from the STM tip. Our results provide a direct visualization of the charge trap formation in individual SiNCs, a level of detail which until now had been achieved only in theoretical studies.
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Affiliation(s)
- Dmitry A Kislitsyn
- Department of Chemistry and Biochemistry, Materials Science Institute, Oregon Center for Optical, Molecular and Quantum Science, University of Oregon , 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Jon M Mills
- Department of Chemistry and Biochemistry, Materials Science Institute, Oregon Center for Optical, Molecular and Quantum Science, University of Oregon , 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Sheng-Kuei Chiu
- Department of Chemistry, Portland State University , Portland, Oregon 97201, United States
| | - Benjamen N Taber
- Department of Chemistry and Biochemistry, Materials Science Institute, Oregon Center for Optical, Molecular and Quantum Science, University of Oregon , 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - James D Barnes
- Department of Chemistry, Portland State University , Portland, Oregon 97201, United States
| | - Christian F Gervasi
- Department of Chemistry and Biochemistry, Materials Science Institute, Oregon Center for Optical, Molecular and Quantum Science, University of Oregon , 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Andrea M Goforth
- Department of Chemistry, Portland State University , Portland, Oregon 97201, United States
| | - George V Nazin
- Department of Chemistry and Biochemistry, Materials Science Institute, Oregon Center for Optical, Molecular and Quantum Science, University of Oregon , 1253 University of Oregon, Eugene, Oregon 97403, United States
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9
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Wang X, Shi W, Jin Z, Huang W, Lin J, Ma G, Li S, Guo L. Remarkable SERS Activity Observed from Amorphous ZnO Nanocages. Angew Chem Int Ed Engl 2017. [PMID: 28651039 DOI: 10.1002/anie.201705187] [Citation(s) in RCA: 139] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Enhancement of the semiconductor-molecule interaction, in particular, promoting the interfacial charge transfer process (ICTP), is key to improving the sensitivity of semiconductor-based surface enhanced Raman scattering (SERS). Herein, by developing amorphous ZnO nanocages (a-ZnO NCs), we successfully obtained an ultrahigh enhancement factor of up to 6.62×105 . This remarkable SERS sensitivity can be attributed to high-efficiency ICTP within a-ZnO NC molecule system, which is caused by metastable electronic states of a-ZnO NCs. First-principles density functional theory (DFT) simulations further confirmed a stronger ICTP in a-ZnO NCs than in their crystalline counterparts. The efficient ICTP can even generate π bonding in Zn-S bonds peculiar to the mercapto molecule adsorbed a-ZnO NCs, which has been verified through the X-ray absorption near-edge structure (XANES) characterization. To the best of our knowledge, this is the first time such remarkable SERS activity has been observed within amorphous semiconductor nanomaterials, which could open a new frontier for developing highly sensitive and stable SERS technology.
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Affiliation(s)
- Xiaotian Wang
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
| | - Wenxiong Shi
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore
| | - Zhao Jin
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
| | - Weifeng Huang
- College of Engineering, Peking University, 100871, Beijing, P.R. China
| | - Jie Lin
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
| | - Guanshui Ma
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
| | - Shuzhou Li
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore
| | - Lin Guo
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, 100191, Beijing, P.R. China
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10
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Wang X, Shi W, Jin Z, Huang W, Lin J, Ma G, Li S, Guo L. Remarkable SERS Activity Observed from Amorphous ZnO Nanocages. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705187] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xiaotian Wang
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
| | - Wenxiong Shi
- School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue 639798 Singapore Singapore
| | - Zhao Jin
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
| | - Weifeng Huang
- College of EngineeringPeking University 100871 Beijing P.R. China
| | - Jie Lin
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
| | - Guanshui Ma
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
| | - Shuzhou Li
- School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue 639798 Singapore Singapore
| | - Lin Guo
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University 100191 Beijing P.R. China
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11
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Santos I, Cazzaniga M, Onida G, Colombo L. Atomistic study of the structural and electronic properties of a-Si:H/c-Si interfaces. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:095001. [PMID: 24523359 DOI: 10.1088/0953-8984/26/9/095001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We investigate the structural and electronic properties of the interface between hydrogenated amorphous silicon (a-Si:H) and crystalline silicon (c-Si) by combining tight-binding molecular dynamics and DFT ab initio electronic structure calculations. We focus on the c-Si(100)(1×1)/a-Si:H, c-Si(100)(2×1)/a-Si:H and c-Si(111)/a-Si:H interfaces, due to their technological relevance. The analysis of atomic rearrangements induced at the interface by the interaction between H and Si allowed us to identify the relevant steps that lead to the transformation from c-Si(100)(1×1)/a-Si:H to c-Si(100)(2×1)/a-Si:H. The interface electronic structure is found to be characterized by spatially localized mid-gap states. Through them we have identified the relevant atomic structures responsible for the interface defect states, namely: dangling-bonds, H bridges, and strained bonds. Our analysis contributes to a better understanding of the role of such defects in c-Si/a-Si:H interfaces.
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Affiliation(s)
- Iván Santos
- Departamento de Electricidad y Electrónica, Universidad de Valladolid, E.T.S.I. de Telecomunicación, Paseo Belén 15, E-47011 Valladolid, Spain
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12
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Johlin E, Wagner LK, Buonassisi T, Grossman JC. Origins of structural hole traps in hydrogenated amorphous silicon. PHYSICAL REVIEW LETTERS 2013; 110:146805. [PMID: 25167024 DOI: 10.1103/physrevlett.110.146805] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 11/14/2012] [Indexed: 06/03/2023]
Abstract
The inherently disordered nature of hydrogenated amorphous silicon (a-Si:H) obscures the influence of atomic features on the trapping of holes. To address this, we have created a set of over two thousand ab initio structures of a-Si:H and explored the influence of geometric factors on the occurrence of deep hole traps using density-functional theory. Statistical analysis of the relative contribution of various structures to the trap distribution shows that floating bonds and ionization-induced displacements correlate most strongly with hole traps in our ensemble.
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Affiliation(s)
- Eric Johlin
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | - Tonio Buonassisi
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Jeffrey C Grossman
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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13
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Nolan M, Legesse M, Fagas G. Surface orientation effects in crystalline–amorphous silicon interfaces. Phys Chem Chem Phys 2012; 14:15173-9. [DOI: 10.1039/c2cp42679j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Michael Nolan
- Tyndall National Institute, University College Cork, Lee Maltings, Cork, Ireland.
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