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Duan X, Ye S, Yang J, Li C, Lu C, He X, Zhang L, Wang R, Qiu F, Yang J, Cui H, Wang C. High Curie Temperature Achieved in the Ferromagnetic Mn xGe 1-x/Si Quantum Dots Grown by Ion Beam Co-Sputtering. NANOMATERIALS 2022; 12:nano12040716. [PMID: 35215045 PMCID: PMC8879400 DOI: 10.3390/nano12040716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/05/2022] [Accepted: 02/19/2022] [Indexed: 02/04/2023]
Abstract
Ferromagnetic semiconductors (FMSs) exhibit great potential in spintronic applications. It is believed that a revolution of microelectronic techniques can take off, once the challenges of FMSs in both the room-temperature stability of the ferromagnetic phase and the compatibility with Si-based technology are overcome. In this article, the MnxGe1−x/Si quantum dots (QDs) with the Curie temperature (TC) higher than the room temperature were grown by ion beam co-sputtering (IBCS). With the Mn doping level increasing, the ripening growth of MnGe QDs occurs due to self-assembly via the Stranski–Krastanov (SK) growth mode. The surface-enhanced Raman scattering effect of Mn sites observed in MnGe QDs are used to reveal the distribution behavior of Mn atoms in QDs and the Si buffer layer. The Curie temperature of MnxGe1−x QDs increases, then slightly decreases with increasing the Mn doping level, and reaches its maximum value of 321 K at the doping level of 0.068. After a low-temperature and short-time annealing, the TC value of Mn0.068Ge0.932 QDs increases from 321 K to 383 K. The higher Ge composition and residual strain in the IBCS grown MnxGe1−x QDs are proposed to be responsible for maintaining the ferromagnetic phase above room temperature.
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Affiliation(s)
- Xiaoxiao Duan
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
| | - Shuming Ye
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
| | - Jing Yang
- Key Lab of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China;
| | - Chen Li
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
| | - Chunjiang Lu
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
| | - Xinpeng He
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
| | - Luran Zhang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
| | - Rongfei Wang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
- Correspondence: (R.W.); (J.Y.); (C.W.)
| | - Feng Qiu
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
| | - Jie Yang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
- Correspondence: (R.W.); (J.Y.); (C.W.)
| | - Haoyang Cui
- College of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, China;
| | - Chong Wang
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China; (X.D.); (S.Y.); (C.L.); (C.L.); (X.H.); (L.Z.); (F.Q.)
- Correspondence: (R.W.); (J.Y.); (C.W.)
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Li Y, Li C, Tong H, Chen T, Li G, Huang S, Tang S, Qiu F, Yang J, Sun T, Yang Y, Wang C. Deposition amount effects on the microstructure of ion-beam-sputtering grown Mn 0.03Ge 0.97 quantum dots for spintronic applications. NANOTECHNOLOGY 2021; 32:140001. [PMID: 33339008 DOI: 10.1088/1361-6528/abd50b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Here, a relative simpler and lower cost method, ion beam sputtering deposition was applied to fabricate diluted magnetic Mn x Ge1-x quantum dots (QDs). The effects of Ge-Mn co-deposition amount on the morphology and crystallization of Mn0.03Ge0.97 QDs were investigated systematically by employing the atomic force microscopy and Raman spectroscopy techniques. It can be seen that the morphology, density, and crystallinity of Mn0.03Ge0.97 QDs exhibit unique evolution processes with the increase of Ge-Mn co-sputtering amount. The optimal deposition amount for realizing well size-uniform, large-aspect-ratio, and high-density QDs is also determined. The unique evolution route of diluted magnetic semiconductor QDs and the amount of co-sputtering are also discussed sufficiently.
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Affiliation(s)
- Yahui Li
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Chen Li
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Haochen Tong
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Tao Chen
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Guangyang Li
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Shizhe Huang
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Shumin Tang
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Feng Qiu
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Jie Yang
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Tao Sun
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Yu Yang
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
| | - Chong Wang
- School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
- National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, People's Republic of China
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Liu Y, Yang Y, Chen P, Shan Y, Li Y, Shi J, Hou J, Zhang N, Zhao G, Xu J, Fang Y, Dai N. Nano Ball-Milling Using Titania Nanoparticles to Anchor Cesium Lead Bromine Nanocrystals and Energy Transfer Characteristics in TiO 2 @CsPbBr 3 Architecture. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2004126. [PMID: 32876996 DOI: 10.1002/smll.202004126] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/07/2020] [Indexed: 06/11/2023]
Abstract
Recently, all-inorganic halide perovskite (CsPbX3 , (X = Cl, Br, and I)) nanocrystals (NCs) based hybrid architectures have attracted extensive attention owing to their distinct luminescence characteristics. However, due to stress and lattice mismatch, it is still a challenge to construct heterojunctions between perovskite NCs and the nanostructures with different lattice parameters and non-cubic contour. In this work, a room temperature mechanochemical method is presented to construct TiO2 @CsPbBr3 hybrid architectures, in which TiO2 nanoparticles (NPs) with a hard lattice as nano "balls" mill off the angles and anchor to the CsPbBr3 NCs with a soft lattice. On the contrary, to ball-mill without TiO2 or with conventional ceramics balls replacing TiO2 , CsPbBr3 NCs still maintain cubic contour deriving from their cubic crystal structures. Moreover, the TiO2 @CsPbBr3 architectures display distinct improvement of photoluminescence quantum yields and more excellent thermal stability in contrast with pristine CsPbBr3 owing to the passivation of surface defect, small surface area, and energy transfer from CsPbBr3 to TiO2 . Meanwhile, there is distinct luminous decay characteristic under the radiation of UV and visible light due to the "on" and "off" TiO2 response. The method provides an alternative strategy to acquire other anchoring heterojunctions based on perovskite NCs for further regulating their luminescent characteristics.
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Affiliation(s)
- Yufeng Liu
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Yongge Yang
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Peng Chen
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Yufeng Shan
- Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, P. R. China
- State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, P. R. China
| | - Yang Li
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Jichao Shi
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Jingshan Hou
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Na Zhang
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Guoying Zhao
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Jiayue Xu
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Yongzheng Fang
- School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, P. R. China
| | - Ning Dai
- Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, P. R. China
- State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, P. R. China
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Improved adhesion between SnO2/SiO2 coating and polyimide film and its applications to atomic oxygen protection. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.06.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Tong L, Qiu F, Zeng T, Long J, Yang J, Wang R, Zhang J, Wang C, Sun T, Yang Y. Recent progress in the preparation and application of quantum dots/graphene composite materials. RSC Adv 2017. [DOI: 10.1039/c7ra08755a] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Quantum dots/graphene (QDs/GR) composite materials show a distinct synergistic effect between the QDs and graphene, which has aroused vast attention toward their unique characteristics in the last few decades.
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