基于標(biāo)準(zhǔn)邏輯工藝的阻變存儲器性能及存儲結(jié)構(gòu)研究
[Abstract]:The traditional nonvolatile memory, represented by Flash, has achieved great success, but with the decrease of process size, it is about to reach its physical limit. In order to replace Flash, a new type of nonvolatile memory has been widely studied in recent years. Resistive memory (RRAM) is considered to be one of the most promising new storage technologies because of its simple structure, miniaturization, fast reading and writing speed, low power consumption, good compatibility with standard logic technology and low cost. However, resistive memory has some shortcomings in performance parameter uniformity, high density application, data retention characteristics and operating yield, which need to be further improved. There are many material systems and storage structures with RRAM characteristics, but it is a very difficult issue to select which materials as RRAM, and to meet the requirements of CMOS standard logic process compatibility and integration cost at the same time. Tantalum is widely used in the barrier layer process without the introduction of polluting elements in the TaOx based resistive memory. It has the advantages of cost compatibility and CMOS process compatibility. However, according to the international reports, the low resistance state of TaOx-based RRAM is low, the device power consumption is high, and the device performance is not very ideal. In this paper, we propose the introduction of Ta205/TaOx double-layer structure, which increases the high and low resistive window, reduces the power consumption, and controls the same position of resistive change, which makes the electrical characteristics present repeatability and centralization. In addition, the scheme of 3D device integration and planar process integration of Ta2O5/TaOx bilayer structure for high density and embedded applications are presented. In this paper, 128kbit AlOx/WOy RRAM chip is fabricated based on SMIC0.18um process. The array results of resistive characteristics, such as high and low resistive distribution, position reset voltage statistics, etc., are given. The roles of each layer of thin films in the resistance process and the mechanism of device conversion are analyzed. By comparing the preparation conditions and operation algorithms of different AlOx/WOy RRAM, the data retention characteristics of AlOx/WOy bilayer structure are studied. It is found that the failure rate of the device data retention characteristics after annealing in reducing atmosphere is greatly reduced, and the stronger the operation algorithm is, the stronger the operation algorithm is. The higher the failure rate of device data retention characteristics is, the better the method of improving device data retention characteristics is given from the point of view of process and design. In this paper, the resistance characteristics of AlOx/WOy bilayer structure for different polarity of Forming are studied, and the mechanism based on the energy band angle is proposed based on the composition of the thin film structure. The distribution of the gradient oxygen vacancy in the AlOx layer has obvious response to the polarity of the Forming voltage. When the positive Forming is used, the device exhibits good resistance to conversion, fatigue and anti-reading interference, and the negative Forming is further removed from the AlOx/Al2O3 interface due to the oxygen vacancy. The barrier becomes higher and wider, showing extremely low operating yield and direct breakdown.
【學(xué)位授予單位】:復(fù)旦大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:TP333
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