Nonequilibrium Quantum Electron Transport Properties of Functional Interfaces

2011 Fiscal Year Final Research Report

• Project/Area Number: 22760500
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Physical properties of metals
• Research Institution: Tohoku University
• Principal Investigator: WANG Zhongchang 東北大学, 原子分子材料科学高等研究機構, 助教 (20510548)
• Project Period (FY): 2010 – 2011
• Keywords: 界面 / 電子顕微鏡 / 第一原理計算

Research Abstract

The origin of the long-standing contact issue in silicon carbide devices can be understood and technologically manipulated at atomic level. Using advanced transmission electron microscopy, we attributed qualitatively the formation of ohmic contacts to silicon carbide to an epitaxial, coherent, and atomically ordered interface. First principles calculations predict that this interface can trap an atomic layer of carbon and hence enable lowered Schottky barrier and enhanced quantum electron transport.
An unprecedented insulator-to-metal transition has been discovered in A-site excess, nonstoichiometric oxides, La_<0. 5> Sr_<n+ 1-0. 5> TinO_<3n+ 1>, which is found to be driven by an insulating SrTiO_3 unit cell. The transition is accompanied by electron localization due to a complex interplay of electrons and phonons, and is unusual as the majority of electrons in the conducting phase are confined to within an atomic layer forming a two-dimensional electron gas.

Research Products

• [Journal Article] Enhanced Gas-sensing Properties by SnO_2 Nanosphere Functionalized TiO_2 Nanobelts (2012)
  • Author(s): Wen Zeng, Tianmo Liu, Zhongchang Wang
  • Journal Title: Journal of Materials Chemistry Volume: 22 Pages: 3544
  • Peer Reviewed
• [Journal Article] Double Change Channel Angular Pressing of Magnesium Alloys AZ31 (2012)
  • Author(s): Liwei Lu, Tianmo Liu, Yong Chen, Liguang Wang, Zhongchang Wang
  • Journal Title: Materials and Design Volume: 35 Pages: 138
  • Peer Reviewed
• [Journal Article] Microstructure and Corrosion Behavior of AZ31 Alloys Prepared by Dual Directional Extrusion (2012)
  • Author(s): Liwei Lu, Tianmo Liu, Jian Chen, Zhongchang Wang
  • Journal Title: Materials and Design Volume: 36 Pages: 687
  • Peer Reviewed
• [Journal Article] Electrical Conductivity Optimization in Electrolyte-free Fuel Cells by Single-component Ce_<0. 8> Sm_<0. 2> O_<2-δ>-Li_<0. 15> Ni_<0. 45> Zn_<0. 4> Layer (2012)
  • Author(s): Yanjie Xia, Xiaojuan Liu, Yijia Bai, Hongping Li, Xiaolong Deng, Xiaodong Niu, Xiaojie Wu, Defeng Zhou, Minfeng Lv, Zhongchang Wang, Jian Meng
  • Journal Title: RSC Advances Volume: 2 Pages: 3828
  • Peer Reviewed
• [Journal Article] Effect of Annealing on Microstructure Evolution and Mechanical Property of Cold Forged Magnesium Pipes (2012)
  • Author(s): Liwei Lu, Tianmo Liu, Ming-jen Tan, Jian Chen, Zhongchang Wang
  • Journal Title: Materials and Design Volume: 39 Pages: 131
  • Peer Reviewed
• [Journal Article] Deformation and Fracture Behavior of Hot Extruded Mg Alloys AZ31 (2012)
  • Author(s): Liwei Lu, Tianmo Liu, Yong Chen, Zhongchang Wang
  • Journal Title: Materials Characterization Volume: 67 Pages: 93
  • Peer Reviewed
• [Journal Article] Gas-sensing Property Performance Enhancement in ZnO Nanostructures by Hierarchical Morphology (2012)
  • Author(s): Weiwei Guo, Tianmo Liu, Hejing Zhang, Rong Sun, Yong Chen, Wen Zeng, Zhongchang Wang
  • Journal Title: Sensors and Actuators B Volume: 492 Pages: 166-167
  • Peer Reviewed
• [Journal Article] Structural and Electronic Impact of SrTiO_3 Substrate on TiO_2 Thin Films (2012)
  • Author(s): Zhongchang Wang, Rong Sun, Chunlin Chen, Mitsuhiro Saito, Susumu Tsukimoto, Yuichi Ikuhara
  • Journal Title: Journal of Materials Science Volume: 47 Pages: 5148
  • Peer Reviewed
• [Journal Article] Insulator-Metal Transition Driven by Pressure and B-Site Disorder in Double Perovskite La_2CoMnO_6 (2012)
  • Author(s): Shuhui Lv, Xiaojuan Liu, Hongping Li, Lin Han, Zhongchang Wang, Jian Meng
  • Journal Title: Journal of Computational Chemistry Volume: 33 Pages: 1433
  • Peer Reviewed
• [Journal Article] Adhesion, Atomic Structure and Bonding Variation at TiN/VN Interface by Chemical Segregation (2012)
  • Author(s): Deqiang Yin, Xianghe Peng, Yi Qin, Zhongchang Wang
  • Journal Title: Surface and Interface Analysis Volume: (In press)
  • Peer Reviewed
• [Journal Article] Microstructural Study of Forged Magnesium Pipes at Room Temperature (2012)
  • Author(s): Liwei Lu, Tianmo Liu, Ming-Jen Tan, Yong Chen, Zhongchang Wang
  • Journal Title: Materials Science and Technology Volume: (In Press)
  • Peer Reviewed
• [Journal Article] Electrical Properties Optimization of Calcium Co-doping System : CeO_2-Sm_2O_3 (2012)
  • Author(s): Yanjie Xia, Xiaojuan Liu, Yijia Bai, Hongping Li, Xiaolong Deng, Xiaodong Niu, Xiaojie Wu, Defeng Zhou, Minfeng Lv, Zhongchang Wang, Jian Meng
  • Journal Title: International Journal of Hydrogen Energy Volume: (In Press)
  • Peer Reviewed
• [Journal Article] Atomic-Scale Ti_3SiC_2 Bilayers Embedded in SiC : Formation of Point Fermi Surface (2011)
  • Author(s): Zhongchang Wang, Susumu Tsukimoto, Rong Sun, Mitsuhiro Saito, Yuichi Ikuhara
  • Journal Title: Applied Physics Letters Volume: 98 Pages: 104101
  • Peer Reviewed
• [Journal Article] Gas-sensing Property Improvement of ZnO by Hierarchical Flower-like Architectures (2011)
  • Author(s): Weiwei Guo, Tianmo Liu, Wen Zeng, Dejun Liu, Yong Chen, Zhongchang Wang
  • Journal Title: Materials Letters Volume: 65 Pages: 3384
  • Peer Reviewed
• [Journal Article] Heterointerfaces : Atomic Structures, Electronic States, and Related Properties (2011)
  • Author(s): Zhongchang Wang, Mitsuhiro Saito, Susumu Tsukimoto, Yuichi Ikuhara
  • Journal Title: Journal of the Ceramics Society of Japan Volume: 119 Pages: 783
  • Peer Reviewed
• [Journal Article] Quantifying Adhesion Energy of Mechanical Coatings at Atomistic Scale (2011)
  • Author(s): Deqiang Yin, Xianghe Peng, Yi Qin, Jiling Feng, Zhongchang Wang
  • Journal Title: Applied Surface Science Volume: 258 Pages: 1451
  • Peer Reviewed
• [Journal Article] Atom-Resolved Imaging of Ordered Defect Superstructures at Individual Grain Boundaries (2011)
  • Author(s): Zhongchang Wang, Mitsuhiro Saito, Keith P. McKenna, Lin Gu, Susumu Tsukimoto, Alexander L. Shluger, Yuichi Ikuhara
  • Journal Title: Nature Volume: 479 Pages: 380
  • Peer Reviewed
• [Journal Article] Strain Control of Orbital Polarization and Corrected Metal-Insulator Transition in La_2CoMnO_6 from First Principles (2011)
  • Author(s): Shuhui Lv, Hongping Li, Zhongchang Wang, Lin Han, Yao Liu, Xiaojuan Liu, Jian Meng
  • Journal Title: Applied Physics Letters Volume: 99 Pages: 202110
  • Peer Reviewed
• [Journal Article] Microstructure and Gas-Sensing Property of Titania-Added ZnSnO_3 (2010)
  • Author(s): Wen Zeng, Tianmo Liu, Zhongchang Wang
  • Journal Title: Materials Transactions Volume: 51 Pages: 1326
  • Peer Reviewed
• [Journal Article] Electronic Property and Bonding Configuration at the TiN(111)/VN(111)Interface (2010)
  • Author(s): Deqiang Yin, Xianghe Peng, Yi Qin, Zhongchang Wang
  • Journal Title: Journal of Applied Physics Volume: 108 Pages: 033714
  • Peer Reviewed
• [Journal Article] Microstructure Evolution of Dual-Directional-Extruded Mg Alloy AZ31 : An Experimental and Simulation Study (2010)
  • Author(s): Liwei Lu, Tianmo Liu, Yong Chen, Liguang Wang, Zhongchang Wang
  • Journal Title: Materials Transactions Volume: 51 Pages: 2088
  • Peer Reviewed
• [Journal Article] Dimensionality-Driven Insulator-Metal Transition in A-Site Excess Nonstoichiometric Perovskites (2010)
  • Author(s): Zhongchang Wang, Masaki Okude, Mitsuhiro Saito, Susumu Tsukimoto, Akira Ohtomo, Masaru Tsukada, Masashi Kawasaki, Yuichi Ikuhara
  • Journal Title: Nature Communications Volume: 1 Pages: 106
  • Peer Reviewed
• [Journal Article] Sensitivity Improvement of TiO_2-doped SnO_2 to Volatile Organic Compounds (2010)
  • Author(s): Wen Zeng, Tianmo Liu, Zhongchang Wang
  • Journal Title: Physica E Volume: 43 Pages: 633
  • Peer Reviewed
• [Journal Article] Atomic-Scale Structure and Electronic Property of the LaAlO_3/TiO_2 Interface (2010)
  • Author(s): Zhongchang Wang, Wen Zeng, Lin Gu, Mitsuhiro Saito, Susumu Tsukimoto, Yuichi Ikuhara
  • Journal Title: Journal of Applied Physics Volume: 108 Pages: 113701
  • Peer Reviewed
• [Presentation] Atom-by-Atom Analysis of Functional Ceramics Interfaces and Grain Boundaries (2012)
  • Author(s): Z. C. Wang, M. Saito, S. Tsukimoto, Y. Ikuhara
  • Organizer: The 3^<rd> International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC3)
  • Place of Presentation: Nagaragawa Convention Center, Gifu City, Japan
  • Year and Date: 20120509-11
• [Presentation] Atomic-Scale Structure and Electronic Property of the SrTiO_3/TiO_2 Interface (2012)
  • Author(s): Z. C. Wang, M. Saito, R. Sun, C. L. Chen, S. Tsukimoto, Y. Ikuhara
  • Organizer: International Symposium on Role of Electron Microscopy in Industry
  • Place of Presentation: Nagoya University, Nagoya, Japan
  • Year and Date: 20120119-20
• [Presentation] Atom-by-Atom Analysis of Functional Ceramics Interfaces (2011)
  • Author(s): Z. C. Wang, M. Saito, S. Tsukimoto, Y. Ikuhara
  • Organizer: The 21^<st> Academic Symposium of MRS-J
  • Place of Presentation: Yokohama, Japan
  • Year and Date: 20111219-21
• [Presentation] Insulating-Layer-Induced Insulator-to-Metal Transition in A-site Excess Nonstoichiometric Perovskites (2011)
  • Author(s): Z. C. Wang, M. Okude, M. Saito, S. Tsukimoto, A. Ohtomo, M. Tsukada, M. Kawasaki, Y. Ikuhara
  • Organizer: 15^<th> International Conference on Thin Films
  • Place of Presentation: Kyoto, Japan
  • Year and Date: 20111108-11
• [Presentation] Insulator-to-Metal Transition Induced by Insulating Layers in A-site Excess Nonstoichiometric Oxides (2011)
  • Author(s): Z. C. Wang, M. Okude, M. Saito, S. Tsukimoto, A. Ohtomo, M. Tsukada, M. Kawasaki, Y. Ikuhara
  • Organizer: Materials Science and Technology
  • Place of Presentation: Columbus, Ohio, US
  • Year and Date: 20111016-20
• [Presentation] Direct Imaging of Ordered Defect Superstructures at Grain Boundaries (2011)
  • Author(s): Z. C. Wang, M. Saito, K. McKenna, L. Gu, S. Tsukimoto, A. Shluger, Y. Ikuhara
  • Organizer: Materials Science and Technology
  • Place of Presentation: Columbus, Ohio, US
  • Year and Date: 20111016-20
• [Presentation] Insulating-Layer-Induced Insulator-to-Metal Transition in Ruddlesden-Popper Series (2011)
  • Author(s): Z. C. Wang, M. Saito, S. Tsukimoto, T. Mizoguchi, M. Okude, A. Ohtomo, T. Kita, M. Tsukada, M. Kawasaki, Y. Ikuhara
  • Organizer: International Workshop on Advanced Electron Microscopy and Applications in Materials Science
  • Place of Presentation: Shenyang, China
  • Year and Date: 20110711-15
• [Presentation] Atom-by-atom Analysis of Functional Ceramics Interfaces (2011)
  • Author(s): Z. C. Wang, M. Saito, S. Tsukimoto, Y. Ikuhara
  • Organizer: The 3^<rd> International Conference on Heterogeneous Materials Mechanics (ICHMM 2011)
  • Place of Presentation: Chongming island, Shanghai, China
  • Year and Date: 20110522-26
• [Presentation] Insulator-to-Metal Transition Driven by an Insulating Layer in Ruddlesden-Popper Series (2010)
  • Author(s): Z. C. Wang, M. Okude, M. Saito, S. Tsukimoto, A. Ohtomo, M. Tsukada, M. Kawasaki, Y. Ikuhara
  • Organizer: The 20^<th> Academic Symposium of MRS-J
  • Place of Presentation: Yokohama, Japan
  • Year and Date: 20101220-22
• [Presentation] Introducing Ohmic Contacts into SiC Technology (2010)
  • Author(s): Z. C. Wang, S. Tsukimoto, M. Saito, Y. Ikuhara
  • Organizer: The 6^<th> International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS 2010)
  • Place of Presentation: Cuilin, Guxi Province, China
  • Year and Date: 20101116-19
• [Presentation] Atomic-Scale Structure and Electron Transport of SiC/Ti_3SiC_2 Interface (2010)
  • Author(s): Z. C. Wang, S. Tsukimoto, M. Saito, Y. Ikuhara
  • Organizer: The 13^<th> International Conference on Intergranular and Interphase Boundaries in Materials (iib2010)
  • Place of Presentation: Shima, Mie, Japan
  • Year and Date: 20100627-0702
• [Presentation] Quantum Electron Transport through Functional Interfaces (2010)
  • Author(s): Z. C. Wang, S. Tsukimoto, M. Saito, Y. Ikuhara
  • Organizer: The 2^<nd> International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC2)
  • Place of Presentation: Nagoya, Japan
  • Year and Date: 20100624-0626
• [Presentation] Interface Atomic-Scale Structure and its Impact on Quantum Electron Transport (2010)
  • Author(s): Z. C. Wang
  • Organizer: The Third International Conference on Modeling and Simulation (ICMS2010)
  • Place of Presentation: WuXi, JiangSu, China
  • Year and Date: 20100604-0606
• [Book] Silicon Carbide. Materials, Processing and Applications in Electronic Device (2011)
  • Author(s): Z. C. Wang
  • Total Pages: 283-308
  • Publisher: INTECH open