共查询到16条相似文献,搜索用时 546 毫秒
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介绍了在纳米晶浮栅存储器数据保持特性方面的研究工作,重点介绍了纳米晶材料的选择与制备和遂穿介质层工程。研究证明,金属纳米晶浮栅存储器比半导体纳米晶浮栅存储器具有更好的电荷保持特性。并且金属纳米晶制备方法简单,通过电子束蒸发热退火的方法就能够得到质量较好的金属纳米晶,密度约4×1011cm-2,纳米晶尺寸约6~7nm。实验证明,高介电常数隧穿介质能够明显改善浮栅存储器的电荷保持特性,所以在引入金属纳米晶和高介电常数遂穿介质之后,纳米晶浮栅存储器可能成为下一代非挥发性存储器的候选者。 相似文献
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硅纳米晶非挥发存储器由于其卓越的性能以及与传统工艺的高度兼容性,近来引起高度关注。采用两步低压化学气相淀积(LPCVD)生长方式制备硅纳米晶(Si-NC),该方法所制备的硅纳米晶具有密度高、可控性好的特点,且完全兼容于传统CMOS工艺。在此基础上制作四端硅纳米晶非挥发存储器,该器件展示出良好的存储特性,包括10 V操作电压下快速地擦写,数据保持特性的显著提高,以及在105次擦写周期以后阈值电压(Vt)飘移低于10%的良好耐受性。该器件在未来高性能非挥发存储器应用上极具潜质。 相似文献
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快速退火纳米晶化法是目前常用的金属纳米晶制备方法,但其后续600~900℃高温退火会降低器件的电学特性和可靠性。本文提出了热预算低的金属纳米晶制备的新方法—沉积过程中的同步金属薄膜原位纳米晶化法,可以省掉后续单独的退火处理工艺,使金属薄膜同步产生纳米晶化,降低工艺热功耗及简化工艺,从而有效地改善上述薄膜沉积后退火纳米晶化法的不足。在不同衬底温度(250~325 ?C)下,利用同步纳米晶化法制备镍纳米晶存储器。随着生长温度的增加,其存储窗口先增加到最大值再降低。衬底温度为300 ?C时,其存储窗口(2.78 V)最大。与快速热退火法镍纳米晶存储器相比较,同步纳米晶化法制备镍纳米晶存储器具有更强的电荷存储能力。另外,研究了不同操作电压和脉冲时间下器件的平带电压偏移量,当操作电压增加到±10 V时出现了较大的平带电压偏移量,这表明器件发生了大量的载流子(电子和空穴)注入现象。最后,模拟了金属纳米晶存储器的载流子(电子和空穴)注入和释放过程。 相似文献
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Performance and reliability of a 2 transistor Si nanocrystal nonvolatile memory(NVM) are investigated. A good performance of the memory cell has been achieved,including a fast program/erase(P/E) speed under low voltages,an excellent data retention(maintaining for 10 years) and good endurance with a less threshold voltage shift of less than 10%after 10~4 P/E cycles.The data show that the device has strong potential for future embedded NVM applications. 相似文献
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3C行业的不断发展,催生了对高密度、持久保存、快速擦写、鲁棒可靠性的非易失性存储器(如flash)的持续需求,促使我们在科研上不断地深入研究新材料、新工艺。在本文中,我们首次采用了区别于传统CMOS工艺的两步工艺方法来制作金属纳米晶非易失性存储器。这种方法,由于将金纳米晶的化学合成和后续组装分离开来,所以能够独立地调节纳米晶的尺寸和组装密度,而且可以很好地避免一直困扰的金属扩散问题。最终的形貌表征和电学测量结果,证实存在一个最优化的纳米晶密度--在这个最优化条件下,我们的存储器件,既有持久的保存时间,又有较大的存储窗口。而组装密度的可调,同时可以满足我们对于大的存储窗口/较长保存时间某一方面的偏好。这些实验结果,都很好地证明了我们两步工艺方法的可行性。 相似文献
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A novel two-step method is employed,for the first time,to fabricate nonvolatile memory devices that have metal nanocrystals.First,size-averaged Au nanocrystals are synthesized chemically;second,they are assembled into memory devices by a spin-coating technique at room temperature.This attractive approach makes it possible to tailor the diameter and control the density of nanocrystals individually.In addition,processes at room temperature prevent Au diffusion,which is a main concern for the application of... 相似文献
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Impact of crystal size and tunnel dielectric on semiconductor nanocrystal memory performance 总被引:1,自引:0,他引:1
Min She Tsu-Jae King 《Electron Devices, IEEE Transactions on》2003,50(9):1934-1940
The write/erase characteristics of Germanium nanocrystal memory device are modeled using single-charge tunneling theory with quantum confinement and Coulomb blockade effects. A trap model is proposed to describe the retention characteristic of the nanocrystal memory. The impact of nanocrystal size, tunnel-oxide thickness, and high-k tunnel material is studied, and the suitability of the nanocrystal memory devices for nonvolatile memory and DRAM applications is discussed. Issues related to the scaling limit of the nanocrystal memory device are investigated. 相似文献
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Yingtao Li 《Microelectronics Journal》2009,40(1):92-94
Recently, nanocrystal nonvolatile memory (NVM) devices have attracted great research interest. Taking into account the effect of work function to account for the better retention characteristics for nanocrystals with larger work function, utilizing different work functions Au, W and Si as floating gates is proposed and comparatively studied in this paper. It was found that Au nanocrystals have better retention characteristic than W and Si. The good retention characteristic of the Au nanocrystal device is due to the larger work function and it is difficult for electrons captured by Au nanocrystal to escape from them. So, the retention characteristic of the device can be improved by using larger work function nanocrystal materials. 相似文献