Transparent Oxide Electronics
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Persons
Elvira Fortunato is Associate Professor and Director of Institute for Nanotechnologies, Nanomaterials and Nanosciences at the New University of Lisbon. She is one of the inventors of paper transistors and paper memory and was one of the pioneers of European research on thin-film transistors based on oxide semiconductors. She has been Associate Editor of Rapid Research Letters Physica Status Solidi since November 2006 and is the recipient of several awards, including the award for Scientific Excellence from the Portuguese Science Foundation (2005). She is the author of more than 200 papers and has been an invited speaker at MRS, E-MRS and NAIST. Coauthors at CENIMAT, New University of Lisbon: Rodrigo Ferrão de Paiva Martins, Luís Pereira, Pedro Barquinha.
Content
Preface xiii
Acknowledgments xv
1 Introduction 1
1.1 Oxides and Transparent Electronics: Fundamental Research or Heading Towards Commercial Products? 1
1.2 The Need for Transparent (Semi)Conductors 3
1.3 Reaching Full Transparency: Dielectrics and Substrates 5
References 6
2 N-type Transparent Semiconducting Oxides 9
2.1 Introduction: Binary and Multicomponent Oxides 9
2.1.1 Binary Compounds: the Examples of Zinc Oxide and Indium Oxide 9
2.1.2 Ternary and Quaternary Compounds: the Examples of Indium-Zinc Oxide and Gallium-Indium-Zinc Oxide 12
2.2 Sputtered n-TSOs: Gallium-Indium-Zinc Oxide System 16
2.2.1 Dependence of the Growth Rate on Oxygen Content in the Ar+O2 Mixture and Target Composition 16
2.2.2 Structural and Morphological Properties 18
2.2.3 Electrical Properties 22
2.2.4 Optical Properties 41
2.3 Sputtered n-TSOs: Gallium-Zinc-Tin Oxide System 49
2.4 Solution-Processed n-TSOs 51
2.4.1 ZTO by Spray-pyrolysis 51
2.4.2 ZTO by Sol-gel Spin-coating 52
2.4.3 GIZO Sol-gel by Spin-coating 52
References 55
3 P-type Transparent Conductors and Semiconductors 63
3.1 Introduction 63
3.2 P-type Transparent Conductive Oxides 64
3.3 Thin Film Copper Oxide Semiconductors 66
3.3.1 Role of Oxygen in the Structure, Electrical and Optical Performance 70
3.4 Thin Film Tin Oxide Semiconductors 75
3.4.1 Structure, Composition and Morphology of Tin Oxide Films 78
3.4.2 Electrical and Optical Properties of Tin Oxide Films 84
References 94
4 Gate Dielectrics in Oxide Electronics 101
4.1 Introduction 101
4.2 High-k Dielectrics: Why Not? 102
4.3 Requirements 103
4.4 High-k Dielectrics Deposition 106
4.5 Sputtered High-k Dielectrics in Oxide TFTs 106
4.6 Hafnium Oxide 107
4.6.1 Multicomponent Co-sputtered HfO2 Based Dielectrics 117
4.6.2 Multicomponent Dielectrics from Single Target 126
4.7 Tantalum Oxide (Ta2O5) 130
4.7.1 Multicomponent Ta2O5 Based Dielectrics 133
4.8 Multilayer Dielectrics 138
4.9 High-k Dielectrics/Oxide Semiconductors Interface 141
4.10 Summary 146
References 147
5 The (R)evolution of Thin-Film Transistors (TFTs) 155
5.1 Introduction: Device Operation, History and Main Semiconductor Technologies 155
5.1.1 Device Structure and Operation 155
5.1.2 Brief History of TFTs 161
5.1.3 Comparative Overview of Dominant TFT Technologies 168
5.2 Fabrication and Characterization of Oxide TFTs 170
5.2.1 N-type GIZO TFTs by Physical Vapor Deposition 171
5.2.2 N-type GZTO TFTs by Physical Vapor Deposition 187
5.2.3 N-type Oxide TFTs by Solution Processing 189
5.2.4 P-type Oxide TFTs by Physical Vapor Deposition 193
5.2.5 N-type GIZO TFTs with Sputtered Dielectrics 196
References 202
6 Electronics With and On Paper 211
6.1 Introduction 211
6.2 Paper in Electronics 212
6.3 Paper Properties 214
6.3.1 Structure, Morphology and Thermal Properties 214
6.3.2 Electrical Properties of the Paper 218
6.4 Resistivity Behaviour of Transparent Conductive Oxides Deposited on Paper 223
6.5 Paper Transistors 225
6.5.1 Current Transport in Paper Transistors 228
6.6 Floating Gate Non-volatile Paper Memory Transistor 230
6.6.1 Memory Paper Device Feasibility and Stability 233
6.6.2 Memory Selective and Charge Retention Time Behaviors 234
6.7 Complementary Metal Oxide Semiconductor Circuits With and On Paper - Paper CMOS 237
6.7.1 Capacitance-Voltage and Current-Voltage Characteristics of N/P-Type Paper Transistors 240
6.7.2 N- and P-channel Paper FET Operation 243
6.7.3 CMOS Inverter Working Principles 244
6.7.4 Paper CMOS Performance 246
6.8 Solid State Paper Batteries 249
6.9 Electrochromic Paper Transistors 252
6.10 Paper UV Light Sensors 255
References 256
7 A Glance at Current and Upcoming Applications 267
7.1 Introduction: Emerging Areas for (Non-)transparent Electronics Based on Oxide Semiconductors 267
7.2 Active Matrices for Displays 268
7.2.1 Display Market Overview and Future Trends 268
7.2.2 Driving Schemes and TFT Requirements for LCD and OLED Displays 269
7.2.3 Displays with Oxide-Based Backplanes 271
7.3 Transparent Circuits 273
7.3.1 Inverters and Ring Oscillators 273
7.3.2 The Introduction of Oxide CMOS 275
7.4 Oxide Semiconductor Heterojunctions 278
7.4.1 Oxide Semiconductor Heterojunctions in the Literature 278
7.4.2 GIZO Heterojunctions Fabricated at CENIMAT 279
7.5 Field Effect Biosensors 280
7.5.1 Device Types and Working Principles 280
7.5.2 Oxide-Based Biosensors Fabricated at CENIMAT 281
References 284
Index 287
