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研究生: 張祐銘
Chang, Yu-Ming
論文名稱: 以TCAD模擬基於奈米片結構的邏輯非揮發性記憶體
TCAD Simulation of Logic Non-Volatile Memory Based on Nanosheet Structure
指導教授: 盧達生
Lu, Darsen
學位類別: 碩士
Master
系所名稱: 電機資訊學院 - 微電子工程研究所
Institute of Microelectronics Engineering
論文出版年: 2021
畢業學年度: 109
語文別: 英文
論文頁數: 53
中文關鍵詞: 環繞式閘級製程 、邏輯非揮發性記憶體 、穿隧機制 、熱載子機制
外文關鍵詞: Gate all around, Logic non-volatile memory, Tunneling, Hot carrier injection
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  • 邏輯非揮發性記憶體有著能跟邏輯製程進行整合的特點,因此在需要嵌入記憶體的電路中時常被使用到。不過由與本身的結構設計,自身的面積會較為龐大,使得儲存空間小於外插式記憶體許多。
    本論文根據現在新式的製程環繞式閘級製程結構設計了邏輯非揮發性記憶體。如此一來不僅能縮小面積,並且能了解跟新式製程之間的相容性。那在設計出結構後,我們利用TCAD模擬元件進行編程和擦除的動作,其中考慮到穿隧機制以及熱載子機制。在初步的模擬後,藉由調整結構的參數,進行記憶體儲存能力的優化,使得記憶窗大幅增加。在優化的過程,了解元件要改善所需要調整的方向。
    在完成元件的改良後,研究的下一步為設計出元件之間的接線方式以組成記憶體陣列,包括NAND跟NOR型態的陣列。在組成記憶體陣列後,我們成功的模擬出記憶體陣列中元件之間的互動。證實了邏輯非揮發性記憶體跟環繞式閘級製程之間的匹配度。

    Logical non-volatile memory is often used in circuits requiring embedded memory because it can be integrated with logic processes. However, its area is larger due to its structural design, making the storage space much smaller than the external memory.
    This study designed a logical non-volatile memory based on a state-of-the-art gate-all-around (nanosheet) process. In this way, we not only reduce the area but also investigate the compatibility with the new process. Then, after designing the structure, we use TCAD to simulate the device for programming and erasing operations, considering the tunneling and hot carrier mechanisms. After finishing the initial simulation, the memory storage capacity is optimized by adjusting the parameters of the structure, resulting in a significant increase in the memory window. During the optimization process, the directions that need to be adjusted to improve the components are understood.
    After improving the components, the next step of the study is to design the interconnections between the components to form memory arrays, including NAND and NOR type arrays. After building the memory arrays, we successfully simulated the circuitry between the components in the memory arrays. The compatibility between the logical non-volatile memory and the GAA process is confirmed.

    摘要 I Abstract II Acknowledgment III Content IV List of Table VI List of Figure VII Chapter 1 Introduction 1 1.1 Motivation 1 1.2 Research Objective 2 Chapter 2 Literature Review 3 2.1 Flash Memory 3 2.1.1 Memory Array 4 2.2 Logic Non-volatile Memory 6 2.2.1 Logic NVM Structure 6 2.2.2 Program and Erase Operation 7 2.2.3 Logic NVM vs. Flash 8 2.3 Nanosheet Structure 9 Chapter 3 Physical Mechanism and Environment Setup 11 3.1 Physical Mechanism 11 3.1.1 Tunneling 11 3.1.2 Hot Carrier Injection 14 3.2 TCAD physical model 15 3.2.1 Shockley-Read-Hall Model 15 3.2.2 Non-local Tunneling Model 16 3.2.3 Hot Carrier Injection Model 17 3.2.4 Threshold Voltage Extraction Model 20 Chapter 4 Result and Discussion 21 4.1 Simulation Logic NVM Structure 21 4.1.1 Device Operation 23 4.1.2 Simulation Confirmation 24 4.2 Initial Simulation 26 4.3 Structure Optimization 29 4.3.1 Bottom Width 30 4.3.2 Channel Length 32 4.3.3 Oxide Thickness 35 4.3.4 Dimension Optimization 38 4.3.5 Summary 41 4.4 Memory Array 41 4.4.1 NAND type 41 4.4.2 NOR type 44 Chapter 5 Conclusion and Future Work 46 5.1 Conclusion 46 5.2 Future Work 47 Answer to Thesis Defense Question 49 Reference 51

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