DGIST Scholar: Strongly correlated metals for transparent conductors

Department of Physics and Chemistry Theses Ph.D.

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Strongly correlated metals for transparent conductors

Title: Strongly correlated metals for transparent conductors

Author(s): Youngkyoung Ha

DGIST Authors: Youngkyoung Ha ; Shinbuhm Lee ; Myoung-Jae Lee

Advisor: 이신범

Co-Advisor(s): Myoung-Jae Lee

Issued Date: 2023

Awarded Date: 2023-02-01

Type: Thesis

Description: Transparent conductor (투명 전도체), strongly correlated metal (강상관 전자계 금속), wide transparency range(투과 영역), epitaxial thin film (에피 박막)

Table Of Contents: Ⅰ. Introduction 1
Ⅱ. Strongly correlated transparent conductors 2
Ⅲ. Endurance against oxygen vacancies 3
3.1 Overview 3
3.2 Experimental details 5
3.3 Correlation-driven thickness reduction 11
3.4 Comparison with previous studies 14
3.5 Effect of oxygen vacancies on transparent conducting performance 15
3.6 Understanding the intriguing transparent conducting performance 15
3.7 Summary 17
Ⅳ. Unified design principle 18
4.1 Establishment of design principle 18
4.2 Experimental details 22
4.3 Performance of the transparent conductors 25
4.3.1 Enhanced transparency range 25
4.3.2 Electrical conducting properties 25
4.4 Application of design principle 28
4.4.1 Effect of correlated strength 28
4.4.2 Effect of p–d transition 30
4.5 Summary 33
Ⅴ. Lattice-orbital-charge coupled transparent conductors 34
5.1 Research Background 34
5.2 Experimental details 34
5.3 Transparent conducting performance 38
5.3.1 Enhanced infrared transparency 38
5.3.2 Metallic behavior 43
5.4 Ba substitution to induce the symmetry breaking of VO6 45
5.5 Reconstruction of V-t2g orbital 50
5.6 Modification of the electronic band structure 53
5.7 Summary 57
Ⅵ. Vertically aligned nanocomposite transparent conductors 58
6.1 Research background 58
6.2 Experimental details 60
6.3 Spontaneous phase separation 60
6.4 Super-broadband transparent conductors 66
6.4.1 Super-broadband transparency 66
6.4.2 Electrical conducting properties 66
6.5 Embedded Ba3V2O8 nanocolumns in the conducting SrVO3 films 69
6.6 Enabling epitaxial growth of our VAN-TCs 73
6.7 Growth mechanism of VAN-TCs 76
6.8 Summary 78
Ⅶ. Conclusion remarks 79
References 80
Summary (in Korean) 87