38results about How to "Strong data retention" patented technology

Provided are a flash memory unit and a floating gate forming method thereof. The floating gate forming method of the flash memory unit comprises the following steps of providing a substrate on which a floating gate layer doped with first type ions is formed; forming a graphical first photoresist on the floating gate layer doped with the first type ions; etching the graphical first photoresist through a dry method, wherein the figure of the first photoresist after etching through the dry method has a smaller dimension than the figure of the first photoresist before etching through the dry method; and performing a second type ion injection to the floating gate layer doped with the first type ions by using the first photoresist after etching through the dry method as a mask layer to form a floating gate layer with a double doped structure, wherein the first type ions is inversed with the second type ions. According to the floating gate of the flash memory unit and the flash memory unit forming method, the flash memory unit that is small in critical dimension and has the double doped floating gate structure can be produced, and the flash memory unit is high in programming efficiency, high in data maintenance capability and low in cost of processing.

An erasable rewriting phase change optical disk capable of being subjected to fluorescent read comprises an upper protective layer, a recording layer, a lower protective layer and a disk base, and is characterized in that the recording layer is a fluorescent phase change recording layer; the fluorescent phase change recording layer is formed by mixing an Sb2Te3-GeTe film into BiSb of which the thickness is 10-200 nm or mixing the Sb2Te3-GeTe film into NiO of which the thickness is 10-200 nm. The optical disk reserves the characteristics of quick writing and erasing speed, strong data retentivity and high cycling stability of the conventional phase change optical disk, and meanwhile the signal-to-noise ratio of reading is greatly improved. The reading is not reflective reading, no extra metal reflecting layer is needed, and the structure of the film is simpler as compared with the conventional phase change optical disk.

The invention provides a phase change thin film material, a phase change memory unit and a preparation method thereof, wherein the general formula of the phase change thin film material is Ni x Ti y Sb z Te 100‑x‑y‑z , where 0<x≤40, 15≤y≤85, 15≤z≤85, 30≤x+y+z<100. The phase change thin film material provided by the present invention can achieve reversible phase change through external electric pulses. There are obvious high and low resistance states before and after the phase change, and the difference is large, which is convenient for the external circuit to easily read "0" or "1". "state, is an ideal phase-change storage material; the phase-change thin film material of the present invention, and the commonly used Ge 2 Sb 2 Te 5 In comparison, it has higher crystallization temperature, faster crystallization speed, lower operating voltage and more stable chemical preparation process.

The invention provides a phase change memory material and a preparation method thereof. The phase change memory material is the compound of silicon-bismuth-tellurium, the general equation is SiBiyTe100-(x+y), wherein x is more than 10 but less than 90, and y is more than 0 and less than 50. Compared with the prior art, the phase change memory material has the advantages of being simple in structure, small in grains, high in heating efficiency, low in power dissipation, fast in device storage speed, high in crystallization temperature, good in heat stability, strong in data retention and the like.

The invention relates to a nanocomposite phase-change material, a preparation method and an application thereof in a phase-change memory, wherein the nanocomposite phase-change material comprises a phase-change material GeTe with a molar percentage of 70-99% and a medium material HfO2 with a molar percentage of 1-30%. The phase-change material GeTe and the medium material HfO2 are uniformly compounded in a nanoscale, so that the crystallization of the phase-change material is suppressed, the thermal stability of the material is enhanced and the data keeping capacity of the material is improved on one hand, and the valid programming volume is reduced due to the participation of the medium material so as to reduce the volume change before and after the crystallization of phase-change unit and decrease the RESET current on the other hand; therefore, the operation stability and the realization of low power consumption of storage apparatus are promoted. In a word, the novel nanocomposite phase-change material is applied to a memory, and is capable of decreasing the RESET voltage of a phase-change storage apparatus and reducing the programming volume, which is beneficial to realizing high-density storage, increasing the heating efficiency of the phase-change memory during programming process, decreasing the power consumption, enhancing data keeping capacity, and the like.

The invention discloses a Ge-Sb-Te-Se film material for a phase change random access memory and a preparation method of the material. The material is characterized by consisting of germanium, stibium, tellurium and selenium elements; a general formula of the material is (Sb2Se)x(Ge2Sb2Te5)y; the mole percentage x of Sb2Se is greater than 0% and less than or equal to 84%; the mole percentage y of GST is greater than or equal to 16% and less than or equal to 95%; and x+y is equal to 100. The method comprises the following concrete steps of controlling the vacuum degree of a magnetron sputtering coating system to be 0-1.6*10<-4>Pa, controlling luminance build-up air pressure required by sputtering to be 0.3Pa, controlling the power of a radio-frequency power supply on an Sb2Se target to be 3-13W, controlling the power of a radio-frequency power supply on a GST target to be 5-50W, controlling the sputtering time to be 10-60min, and performing deposition to obtain the Ge-Sb-Te-Se film material. The material has the advantages of good heat stability, high data retention and high phase change speed.