With the explosive growth of artificial intelligence (AI) and machine learning applications, the demand for high-performance, high-capacity memory is rapidly increasing. 3D NAND flash memory, as a key storage technology, is improving capacity and performance by increasing the number of stacked layers, and low-temperature etching technology has become the core innovation to achieve this goal. Recently, global semiconductor equipment giants have been competing to push 3D NAND towards the goal of 1000 layers.
1、 AI era drives innovation in memory technology, with 3D NAND layers becoming key
Data intensive AI applications require significant breakthroughs in memory technology, especially NAND flash, to support faster data transfer speeds and lower power consumption. The 3D NAND architecture increases capacity by vertically stacking storage cell layers, but the increase in layers brings a series of manufacturing challenges, including high aspect ratio etching accuracy, production efficiency, and cost control.
Industry analysis points out that moving towards 1000 layer 3D NAND is not only a technological milestone, but also an inevitable requirement for the development of AI. A 3D NAND chip with a thousand layer structure will significantly increase data storage capacity and throughput, which is crucial for AI applications that require fast data retrieval. However, achieving higher layers requires breaking through the physical limits of etching and deposition techniques.
2、 Low temperature etching technology has become the focus of the industry, achieving breakthroughs in both efficiency and environmental protection
1. Lam Cryo 3.0， Etching speed increased by 2.5 times
Lam Cryo 3.0 adopts a high-power restricted plasma reactor, process improvement, and ultra-low temperature environment, combined with a new etching chemical composition, significantly improving etching depth and contour control.
The etching speed of Lam Cryo 3.0 is 2.5 times faster than traditional dielectric processes, while reducing energy consumption per wafer by 40% and emissions by up to 90%. This technology has successfully produced 5 million wafers, supporting memory channels with etching depths of up to 10 microns and critical dimension deviations of less than 0.1%, paving the way for the manufacturing of 1000 layer 3D NAND.

2. Innovative gas system, achieving a threefold increase in etching rate
The low-temperature etching technology based on the new gas system (HF/PF3) can operate at temperatures ranging from -60 ° C to -70 ° C. This technology can complete high aspect ratio etching up to 10 microns deep in 33 minutes, with a speed three times that of traditional tools, and almost no sidewall deposition, avoiding the problem of channel bending.
3、 Challenge and Prospect: The Road to Thousand Layer NAND is Long and arduous
Despite the broad technological prospects, achieving 1000 layer 3D NAND still faces challenges in manufacturing processes, investment risks, and physical limitations. Thousand layer NAND is like building a skyscraper, which requires solving problems such as collapse, bending, connection hole accuracy, and battery interference.
However, with the maturity of key technologies such as low-temperature etching, the industry's confidence in thousand layer NAND continues to increase. Low temperature etching technologies such as Lam Cryo 3.0 are a significant leap beyond traditional methods and will enable chip manufacturers to maintain competitiveness in the AI era.
The breakthrough in low-temperature etching technology is reshaping the production pattern of 3D NAND, driving the industry towards higher layers and higher efficiency. Driven by the wave of AI, semiconductor giants have not only improved storage performance through technological innovation and environmental practices, but also brought consumers solid-state drives with larger capacity and lower cost. In the next decade, thousand layer 3D NAND is expected to move from vision to reality and become the core cornerstone supporting the digital economy.
Precision temperature control - the cornerstone behind semiconductor manufacturing equipment
The stable operation of low-temperature etching technology relies on a key supporting equipment - a cryogenic etch chiller. Taking the ZU35 cryogenic etch chiller as an example, this type of equipment is the hero behind ensuring precise etching, thin film and other process steps.

The ZU35 cryogenic etch Chiller temperature controller, independently developed by  Zonglen is mainly used for precise temperature control of process equipment in semiconductor (FAB) and FPD display processes, such as etching/film/glue/development equipment (such as LAM, AMAT, TEL, NAURA, Naura, Aixtron, Veeco, AMEC, etc.). Cryogenic etch Chiller temperature controller is a temperature control device in the process mainly composed of liquid pump, heat exchanger, liquid storage tank, refrigeration compressor and control system.
Core technical specifications: The ZU35 thermostat can achieve a wide temperature range of -80 ° C to+40 ° C and maintain an extremely high temperature accuracy of ± 0.1 ° C. This provides a stable low-temperature environment guarantee for equipment manufacturers such as Lam Research and Tokyo Electron (TEL) in their low-temperature etching processes.
Key application scenarios: It is mainly used in the manufacturing process of semiconductors and display panels, providing precise temperature control for core process equipment such as etching, thin film deposition, coating and development, and is a key infrastructure to ensure production yield and equipment performance.
Technical advantages: By adopting advanced fuzzy control, energy-saving frequency conversion, and ultra-low temperature refrigeration technology, not only is temperature control precise and reliable, but equipment energy consumption is also greatly reduced, which is in line with the development trend of green manufacturing in the semiconductor industry.
It is these high-precision and cutting-edge basic process equipment that together form the cornerstone of advanced semiconductor manufacturing capabilities, driving the continuous evolution from 3D NAND to the entire computing ecosystem.

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