WO2024138992A1 - 一种基于环状电容的三维1s1c存储器及制备方法 - Google Patents
一种基于环状电容的三维1s1c存储器及制备方法 Download PDFInfo
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- WO2024138992A1 WO2024138992A1 PCT/CN2023/092494 CN2023092494W WO2024138992A1 WO 2024138992 A1 WO2024138992 A1 WO 2024138992A1 CN 2023092494 W CN2023092494 W CN 2023092494W WO 2024138992 A1 WO2024138992 A1 WO 2024138992A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D1/00—Resistors, capacitors or inductors
- H10D1/60—Capacitors
- H10D1/68—Capacitors having no potential barriers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/20—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional [3D] arrangements, e.g. with cells on different height levels
- H10B41/23—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional [3D] arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels
- H10B41/27—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by three-dimensional [3D] arrangements, e.g. with cells on different height levels with source and drain on different levels, e.g. with sloping channels the channels comprising vertical portions, e.g. U-shaped channels
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/30—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D1/00—Resistors, capacitors or inductors
- H10D1/60—Capacitors
- H10D1/68—Capacitors having no potential barriers
- H10D1/692—Electrodes
- H10D1/711—Electrodes having non-planar surfaces, e.g. formed by texturisation
- H10D1/716—Electrodes having non-planar surfaces, e.g. formed by texturisation having vertical extensions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Definitions
- the purpose of the present invention is to propose a three-dimensional 1S1C memory based on a ring capacitor and a preparation method, aiming to solve the problem of complex preparation process of 3D-1S1C memory capacitor with a 3D-NAND-like structure.
- the present invention provides a three-dimensional 1S1C memory based on a ring capacitor, comprising: a horizontal peripheral electrode layer, a vertical functional layer and a capacitor dielectric layer: the peripheral electrode layer comprises a first dielectric layer and a first metal electrode layer alternately stacked and grown on a substrate, and the topmost layer is the first dielectric layer;
- the peripheral electrode layer is provided with a plurality of grooves penetrating in the vertical direction, each groove is parallel to each other, and the bottom of the groove is located in the substrate, the first metal electrode layer in each layer is divided into a plurality of independent strip electrodes by the grooves, and the strip electrodes are word lines of the memory;
- the peripheral electrode layer is provided with a plurality of holes penetrating in the vertical direction, the holes are arranged in an array according to a certain rule, and the bottom of the holes at least extends to the first dielectric layer of the bottom layer; the inner wall of the hole is evenly covered with a layer of gate tube function layer, and the surface of the gate
- first dielectric layers and the first metal electrode layers alternately stacked with each other are periodically repeated in the vertical direction as needed, and the number of repetitions is the same as the number of memory cell layers required by the three-dimensional 1S1C memory.
- all memory cells in the same vertical direction share the same bit line electrode, and all memory cells in the same strip electrode share the same word line electrode.
- the capacitor dielectric layer surrounds the vertical functional layer and cuts off the peripheral electrode layer, and the metal electrode between the vertical functional layer and the capacitor dielectric layer is the top electrode of the storage unit capacitor;
- the spin-coated photoresist is stripped off; then, ultraviolet lithography is performed to etch out the bit line electrode structure of the same column, only the photoresist is developed, and the bit line electrode metal layer is deposited by magnetron sputtering, and then the spin-coated photoresist is stripped off; and the column bit line electrodes shown in FIG1 are prepared.
- the three-dimensional 1S1C memory structure obtained by the above-mentioned preparation method only needs to deposit the storage capacitor unit and the gate tube material once, which reduces the process complexity of the three-dimensional 1S1C memory.
- the number of storage unit layers of the three-dimensional 1S1C memory can be increased by simply increasing the number of word line electrode layers and isolation layers.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
Description
Claims (10)
- 一种基于环状电容的三维1S1C存储器,其特征在于,包括:水平的外围电极层、垂直的功能层及电容介质层:所述外围电极层包括在衬底上交替堆叠生长的第一电介质层与第一金属电极层,最顶层为第一电介质层;所述外围电极层中设置有若干在垂直方向贯穿的沟槽,各个沟槽之间互相平行,且沟槽底部位于所述衬底中,每层中的第一金属电极层均被沟槽分隔为若干独立条状电极,所述条状电极为存储器的字线;所述外围电极层中设置有若干在垂直方向贯穿的孔洞,所述孔洞按一定规律呈阵列排布,孔洞底部至少延伸至最底层的第一电介质层;所述孔洞内壁均匀覆盖一层选通管功能层,选通管功能层表面形成第二金属电极层,第二金属电极层与选通管功能层的底部在垂直方向上的厚度低于最底层的第一金属电极层,每个孔洞外均设置有一环形凹槽,孔洞位于所述环形凹槽的中心位置,环形凹槽环绕孔洞并垂直切断外围电极层,环形凹槽的底部至少延伸至最底层的第一电介质层,环形凹槽内均匀填充有所述电容介质层,第二金属电极层顶部延伸至最顶层的第一电介质层表面形成位线电极并与位线连接,第二金属电极层与第一金属电极层正对的区域构成存储单元。
- 如权利要求1所述的三维1S1C存储器,其特征在于,相互交替堆叠的第一电介质层与第一金属电极层根据需要在垂直方向上周期性重复,且重复次数与三维1S1C存储器需要的存储单元层数相同。
- 如权利要求1所述的三维1S1C存储器,其特征在于,处于同一垂直方向上的所有存储单元共用同一位线电极,处于同一条状电极的所有存储单元共用同一字线电极。
- 如权利要求1所述的三维1S1C存储器,其特征在于,所述第一金 属电极层的厚度和所述孔洞的尺寸满足如下关系:h*w<1um2,其中h为第一金属电极层的厚度,w为孔洞的周长。
- 如权利要求1所述的三维1S1C存储器,其特征在于,所述孔洞按照矩形排布或平行四边形排布。
- 如权利要求1所述的三维1S1C存储器,其特征在于,选通管功能层与第一金属电极层相接触的区域构成选通管单元,其中第二金属电极层为选通管单元的上电极,第一金属电极层与选通管功能层相接触的区域构成选通管单元的下电极,第一金属电极层被环形凹槽垂直切割,留下在水平方向相对的两个电极,与填充的电容介质层构成电容,孔洞与环形凹槽中间夹着的电极为选通管单元的下电极与电容的上电极,用于将选通管单元和电容连接起来构成存储单元。
- 如权利要求1所述的三维1S1C存储器,其特征在于,所述环状凹槽的宽度与电容介质层的介电常数共同决定电容的容值,根据存储单元需要的电容容值大小来设计凹槽的宽度。
- 一种基于权利要求1-7任一项所述的三维1S1C存储器的制备方法,其特征在于,包括以下步骤:S1在存储单元区的衬底上形成外围电极层,包括交替生长第一电介质层与第一金属电极层,第一金属电极层生长的层数与三维1S1C存储器所需要存储单元的层数相同;S2刻蚀形成若干在垂直方向贯穿的环形凹槽,环形凹槽的底部至少延伸至最底层的第一电介质层,并在环形凹槽内填满电容介质层,环形凹槽按一定规律呈阵列排布;S3在每个环形凹槽所围住的区域内刻蚀形成在垂直方向贯穿的孔洞,孔洞位于环形凹槽的中心,孔洞底部至少延伸至最底层的第一电介质层;S4在孔洞的侧壁和底部上依次形成选通管层、第二金属电极层,第二金属电极层延伸至最顶层的第一电介质层表面形成位线电极并与位线连 接;S5刻蚀形成若干在垂直方向贯穿的沟槽,各沟槽之间互相平行,且沟槽底部位于衬底中,沟槽将外围电极层分割为若干相互独立条状部分。
- 如权利要求8所述的制备方法,其特征在于,所述电容介质层的材料包括SiO2或高k材料。
- 如权利要求9所述的制备方法,其特征在于,所述高k材料包括氮化物、金属氧化物、氮氧化物或钙钛矿相氧化物;所述氮化物为SiN、AlN、TiN;所述金属氧化物为副族和镧系金属元素氧化物,例如MgO、Al2O3、Ta2O5、TiO2、ZnO、ZrO2、HfO2、CeO2、Y2O3、La2O3;所述氮氧化物为SiON或HfSiON;所述钙钛矿相氧化物为PbZrxTi1-xO3(PZT)或BaxSr1-xTiO3(BST)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/285,857 US12317522B2 (en) | 2022-12-27 | 2023-05-06 | Three-dimensional 1S1C memory based on ring capacitor and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211686527.5A CN116322032B (zh) | 2022-12-27 | 2022-12-27 | 一种基于环状电容的三维1s1c存储器及制备方法 |
| CN202211686527.5 | 2022-12-27 |
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| WO2024138992A1 true WO2024138992A1 (zh) | 2024-07-04 |
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| PCT/CN2023/092494 Ceased WO2024138992A1 (zh) | 2022-12-27 | 2023-05-06 | 一种基于环状电容的三维1s1c存储器及制备方法 |
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| Country | Link |
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| US (1) | US12317522B2 (zh) |
| CN (1) | CN116322032B (zh) |
| WO (1) | WO2024138992A1 (zh) |
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| CN120166687A (zh) * | 2023-12-14 | 2025-06-17 | 北京超弦存储器研究院 | 存储器及其制造方法、电子设备 |
| CN119012693B (zh) * | 2024-08-05 | 2025-09-30 | 中国科学院微电子研究所 | 一种三维动态随机存取存储器阵列的制备方法 |
| CN119383965B (zh) * | 2024-11-08 | 2026-03-31 | 华中科技大学 | 一种三维存储器及其制备方法 |
| CN119383964B (zh) * | 2024-11-08 | 2026-03-20 | 华中科技大学 | 一种三维动态存储器及其制备方法 |
| CN119486132B (zh) * | 2024-11-08 | 2026-03-13 | 华中科技大学 | 一种三维动态存储器及其制备方法 |
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2022
- 2022-12-27 CN CN202211686527.5A patent/CN116322032B/zh active Active
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2023
- 2023-05-06 US US18/285,857 patent/US12317522B2/en active Active
- 2023-05-06 WO PCT/CN2023/092494 patent/WO2024138992A1/zh not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20190095138A (ko) * | 2018-02-06 | 2019-08-14 | 삼성전자주식회사 | 삼차원 수직 셀 구조를 갖는 디램 |
| CN113366637A (zh) * | 2018-12-31 | 2021-09-07 | 美光科技公司 | 三维动态随机存取存储器阵列 |
| CN112216696A (zh) * | 2019-07-12 | 2021-01-12 | 爱思开海力士有限公司 | 竖直存储器件 |
| CN115377105A (zh) * | 2021-05-20 | 2022-11-22 | 爱思开海力士有限公司 | 半导体存储器件及其制造方法 |
| CN114937738A (zh) * | 2022-05-22 | 2022-08-23 | 华中科技大学 | 一种基于垂直电极的三维相变存储器及制备方法 |
| CN115116963A (zh) * | 2022-06-22 | 2022-09-27 | 长江存储科技有限责任公司 | 存储器及其制作方法、存储器系统 |
Also Published As
| Publication number | Publication date |
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| US20250113505A1 (en) | 2025-04-03 |
| US12317522B2 (en) | 2025-05-27 |
| CN116322032B (zh) | 2024-11-26 |
| CN116322032A (zh) | 2023-06-23 |
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