Conduction mechanisms in Ti/HfOx/Pt resistive switching memory device
Conduction mechanisms of Ti/HfOx/Pt Resistive Random Access Memory (RRAM) were investigated in this work. I-V characteristics of RRAM devices were measured and Ohmic conduction was found to be the dominant conduction mechanism in low resistance state (LRS), while Schottky emission (SE) was found to...
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sg-ntu-dr.10356-1388762023-02-28T23:11:11Z Conduction mechanisms in Ti/HfOx/Pt resistive switching memory device Tan, Kuan Hong Lew Wen Siang School of Physical and Mathematical Sciences wensiang@ntu.edu.sg Science Conduction mechanisms of Ti/HfOx/Pt Resistive Random Access Memory (RRAM) were investigated in this work. I-V characteristics of RRAM devices were measured and Ohmic conduction was found to be the dominant conduction mechanism in low resistance state (LRS), while Schottky emission (SE) was found to dominate in high resistance state (HRS). In addition, multi-level states of Ti/HfOx/Pt devices in HRS were investigated, which device resistances in HRS differ under various RESET voltages. Different RESET voltages also vary the conduction mechanisms, which at -0.9V RESET was found to be SE while that of -1.0V, -1.1V and -1.2V were hopping conductions. From fitted graph of hopping conduction, the distance between traps within HfOx was found to be ~0.8 nm and the traps energy level below bottom of conduction band is ~0.85 eV. -1.3V RESET voltage resulted in Poole-Frenkel emission is the main conduction mechanism. The traps for Poole-Frenkel emission are found ~0.5 eV below the conduction band. In the end of the report, the electric field within hafnium oxide was simulated. The electric field was found to be stronger at the region near the edges of electrodes. In this case, conducting filaments will most likely to form in that region. Furthermore, oxygen vacancies will tend to accumulate at the tip of conducting filaments, due to the greater electric field near that region. This phenomenon results in the growth of conducting filaments. Bachelor of Science in Physics 2020-05-13T08:21:07Z 2020-05-13T08:21:07Z 2020 Final Year Project (FYP) https://hdl.handle.net/10356/138876 en application/pdf Nanyang Technological University |
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Science Tan, Kuan Hong Conduction mechanisms in Ti/HfOx/Pt resistive switching memory device |
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Conduction mechanisms of Ti/HfOx/Pt Resistive Random Access Memory (RRAM) were investigated in this work. I-V characteristics of RRAM devices were measured and Ohmic conduction was found to be the dominant conduction mechanism in low resistance state (LRS), while Schottky emission (SE) was found to dominate in high resistance state (HRS). In addition, multi-level states of Ti/HfOx/Pt devices in HRS were investigated, which device resistances in HRS differ under various RESET voltages. Different RESET voltages also vary the conduction mechanisms, which at -0.9V RESET was found to be SE while that of -1.0V, -1.1V and -1.2V were hopping conductions. From fitted graph of hopping conduction, the distance between traps within HfOx was found to be ~0.8 nm and the traps energy level below bottom of conduction band is ~0.85 eV. -1.3V RESET voltage resulted in Poole-Frenkel emission is the main conduction mechanism. The traps for Poole-Frenkel emission are found ~0.5 eV below the conduction band. In the end of the report, the electric field within hafnium oxide was simulated. The electric field was found to be stronger at the region near the edges of electrodes. In this case, conducting filaments will most likely to form in that region. Furthermore, oxygen vacancies will tend to accumulate at the tip of conducting filaments, due to the greater electric field near that region. This phenomenon results in the growth of conducting filaments. |
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Lew Wen Siang |
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Lew Wen Siang Tan, Kuan Hong |
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Final Year Project |
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Tan, Kuan Hong |
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Tan, Kuan Hong |
title |
Conduction mechanisms in Ti/HfOx/Pt resistive switching memory device |
title_short |
Conduction mechanisms in Ti/HfOx/Pt resistive switching memory device |
title_full |
Conduction mechanisms in Ti/HfOx/Pt resistive switching memory device |
title_fullStr |
Conduction mechanisms in Ti/HfOx/Pt resistive switching memory device |
title_full_unstemmed |
Conduction mechanisms in Ti/HfOx/Pt resistive switching memory device |
title_sort |
conduction mechanisms in ti/hfox/pt resistive switching memory device |
publisher |
Nanyang Technological University |
publishDate |
2020 |
url |
https://hdl.handle.net/10356/138876 |
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1759853099185340416 |