CN113658941A - 一种hzo/ao/hzo纳米叠层薄膜及其制备方法和应用 - Google Patents
一种hzo/ao/hzo纳米叠层薄膜及其制备方法和应用 Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 121
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(IV) oxide Inorganic materials O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 claims abstract description 66
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 39
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 39
- 239000010408 film Substances 0.000 claims description 230
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 60
- 238000000151 deposition Methods 0.000 claims description 50
- 239000007800 oxidant agent Substances 0.000 claims description 33
- 230000008021 deposition Effects 0.000 claims description 32
- 230000001590 oxidative effect Effects 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 26
- 239000010409 thin film Substances 0.000 claims description 26
- 238000000231 atomic layer deposition Methods 0.000 claims description 24
- 229910052735 hafnium Inorganic materials 0.000 claims description 24
- 229910052726 zirconium Inorganic materials 0.000 claims description 24
- 238000000137 annealing Methods 0.000 claims description 23
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 22
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 22
- 239000000758 substrate Substances 0.000 claims description 17
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 238000005137 deposition process Methods 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 9
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical group C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 claims description 7
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000015654 memory Effects 0.000 claims description 5
- PDPJQWYGJJBYLF-UHFFFAOYSA-J hafnium tetrachloride Chemical compound Cl[Hf](Cl)(Cl)Cl PDPJQWYGJJBYLF-UHFFFAOYSA-J 0.000 claims description 4
- DUNKXUFBGCUVQW-UHFFFAOYSA-J zirconium tetrachloride Chemical compound Cl[Zr](Cl)(Cl)Cl DUNKXUFBGCUVQW-UHFFFAOYSA-J 0.000 claims description 4
- VBCSQFQVDXIOJL-UHFFFAOYSA-N diethylazanide;hafnium(4+) Chemical compound [Hf+4].CC[N-]CC.CC[N-]CC.CC[N-]CC.CC[N-]CC VBCSQFQVDXIOJL-UHFFFAOYSA-N 0.000 claims description 3
- GOVWJRDDHRBJRW-UHFFFAOYSA-N diethylazanide;zirconium(4+) Chemical compound [Zr+4].CC[N-]CC.CC[N-]CC.CC[N-]CC.CC[N-]CC GOVWJRDDHRBJRW-UHFFFAOYSA-N 0.000 claims description 3
- ZYLGGWPMIDHSEZ-UHFFFAOYSA-N dimethylazanide;hafnium(4+) Chemical compound [Hf+4].C[N-]C.C[N-]C.C[N-]C.C[N-]C ZYLGGWPMIDHSEZ-UHFFFAOYSA-N 0.000 claims description 3
- DWCMDRNGBIZOQL-UHFFFAOYSA-N dimethylazanide;zirconium(4+) Chemical compound [Zr+4].C[N-]C.C[N-]C.C[N-]C.C[N-]C DWCMDRNGBIZOQL-UHFFFAOYSA-N 0.000 claims description 3
- CRHIBFCNJROORF-UHFFFAOYSA-N hafnium(4+);methylazanide Chemical compound [Hf+4].[NH-]C.[NH-]C.[NH-]C.[NH-]C CRHIBFCNJROORF-UHFFFAOYSA-N 0.000 claims description 2
- 239000005001 laminate film Substances 0.000 claims description 2
- HIJQSNMJOVJSRI-UHFFFAOYSA-N methylazanide;zirconium(4+) Chemical compound [Zr+4].[NH-]C.[NH-]C.[NH-]C.[NH-]C HIJQSNMJOVJSRI-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 9
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 19
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- 238000005516 engineering process Methods 0.000 description 17
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- 238000001755 magnetron sputter deposition Methods 0.000 description 13
- 239000003990 capacitor Substances 0.000 description 9
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- 230000001276 controlling effect Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
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- 238000011056 performance test Methods 0.000 description 6
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- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 3
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
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- 238000011160 research Methods 0.000 description 2
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- 230000000087 stabilizing effect Effects 0.000 description 2
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 101100353526 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) pca-2 gene Proteins 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910007746 Zr—O Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- NPEOKFBCHNGLJD-UHFFFAOYSA-N ethyl(methyl)azanide;hafnium(4+) Chemical compound [Hf+4].CC[N-]C.CC[N-]C.CC[N-]C.CC[N-]C NPEOKFBCHNGLJD-UHFFFAOYSA-N 0.000 description 1
- SRLSISLWUNZOOB-UHFFFAOYSA-N ethyl(methyl)azanide;zirconium(4+) Chemical compound [Zr+4].CC[N-]C.CC[N-]C.CC[N-]C.CC[N-]C SRLSISLWUNZOOB-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
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- 230000002687 intercalation Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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Abstract
本发明公开了一种HZO/AO/HZO纳米叠层薄膜及其制备方法和应用,所述薄膜由HZO顶层、AO中层、HZO底层构成,其中HZO顶层由HfO2膜层与ZrO2膜层交替层叠组成,AO中层为Al2O3膜层,HZO底层由HfO2膜层与ZrO2膜层交替层叠组成。本发明的技术方案使用HfO2层及ZrO2层交替沉积,通过纳米叠层结构引入界面以调控界面能来稳定物相,并有效阻碍“电树”的生长,避免击穿的发生。此外,界面还能减小电子注入深度并抑制局部相分解,从而最终提高疲劳性能。另一方面,引入介质层Al2O3促进180°畴的形成以降低内建电场,削弱电畴的固定取向程度,减小漏电流密度。本发明能够解决具有良好铁电性能的HZO/AO/HZO纳米叠层层薄膜的制备技术难题,可简单、可控地生产高质量的铁电薄膜。
Description
技术领域
本发明属于铁电薄膜技术制备领域,具体涉及一种HZO/AO/HZO纳米叠层薄膜及其制备方法和应用。
背景技术
近年来,人们对高性能个人电子设备的需求,推动着下一代低功耗高密度存储技术的步伐。铁电材料展现出的电场诱导极化后的滞后现象,预示着这类材料在下一代存储器中的应用。铁电随机存储器(FeRAM)的发展一直以来集中于钙钛矿材料,这类材料带隙较小,势垒较低,因此,通常需要制备出厚膜以避免在基于钙钛矿的FeRAM中出现大的漏电流,这是在先进技术节点(22nm以下)上实施这些材料的主要障碍。目前已经有大量报道表明在掺杂HfO2薄膜和Hf0.5Zr0.5O2固溶体中观察到铁电性,并且正努力将这些材料开发成基于钙钛矿的FeRAM的可行替代品。然而,掺杂元素的含量难以控制限制了其在商业生产中的使用。与传统的钙钛矿基铁电体相比,基于HfO2和ZrO2的铁电体具有许多优点:1)HfO2和ZrO2具有比钙钛矿型材料更大的带隙(Eg),使较薄的膜能够应用于电容器中;2)由于强结合能的Hf-O和Zr-O键存在,HfO2和ZrO2在退火后更能有效地抵抗退极化;3)HfO2和ZrO2作为高-k材料,被广泛用于先进节点技术中,推动了沉积三维结构的原子层沉积工艺的发展,使这些材料完全与现代半导体集成方案兼容。
调控HfO2和ZrO2中的多晶型结构是目前研究的焦点,以促进在互补金属-氧化物-半导体(CMOS)应用中使用高-k相结构作为电介质。在常温常压下块体结构的HfO2和ZrO2中,最稳定存在的是单斜相(P21/c),四方相(P42/nmc)和立方相仅在高温下变得稳定。目前发现降低薄膜厚度可以提高四方相和立方相在室温下的稳定性,这种现象归因于增加的表面能量效应。HfO2基薄膜的铁电响应是由于非中心对称的正交相(Pca21)所引起的,此外还需要选择合适的工艺条件来使铁电相稳定。自从铁电行为首次报道在HfO2基薄膜中,研究者们已经发现了使铁电正交相稳定的几种方法:氧空位、应力和表面能效应。
目前关于HfO2的研究主要集中于剩余极化强度的提高,主要通过外延生长、调整电极材料等来实现铁电相含量的提高,且为了追求高的剩余极化强度,一般选择10nm左右的最优厚度,这不可避免地容易因漏电流过大而击穿,进而导致器件失效。此外,铁电薄膜内部往往因自发极化而产生内建电场,畴壁的运动在一定程度上受到限制,这导致剩余极化强度的降低,存储窗口减小。
发明内容
针对现有技术的不足,本发明的目的在于提供一种具有良好铁电性能的非掺杂HZO/AO/HZO((HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n)纳米叠层薄膜及其制备方法,本发明从叠层结构设计和介质层插层两个方面对HfO2基铁电薄膜进行性能优化,选择与HfO2晶体结构和性质相似的ZrO2进行叠层,并使用低介电常数的Al2O3插层优化叠层薄膜的铁电性能。本发明的制备方法简单可控。
为了实现上述目的,本发明采用如下技术方案:
本发明一种HZO/AO/HZO纳米叠层薄膜,所述薄膜由HZO顶层、AO中层、HZO底层构成,其中HZO顶层由HfO2膜层与ZrO2膜层交替层叠组成,AO中层为Al2O3膜层,HZO底层由HfO2膜层与ZrO2膜层交替层叠组成;所述HZO顶层中任意一层HfO2膜层的厚度为0.8~1.5nm,所述HZO顶层中任意一层ZrO2膜层的厚度为0.8~1.5nm,所述HZO顶层中,HfO2膜层的层数为2~5层;优选为3~4层,所述Al2O3膜层的厚度为1~2nm,所述HZO底层中任意一层HfO2膜层的厚度为0.8~1.5nm,所述HZO底层中任意一层ZrO2膜层的厚度为0.8~1.5nm,所述HZO底层中,HfO2膜层的层数为2~5层,优选为3~4层。
本发明的技术方案使用HfO2层及ZrO2层交替沉积,通过纳米叠层结构引入界面以调控界面能来稳定物相,并有效阻碍“电树”的生长,避免击穿的发生。此外,界面还能减小电子注入深度并抑制局部相分解,从而最终提高疲劳性能。另一方面,引入介质层Al2O3促进180°畴的形成以降低内建电场,削弱电畴的固定取向程度。非晶形态Al2O3对铁电层的晶体结构没有较大的影响,而且Al2O3对比HfO2及ZrO2来说,其相对介电常数较低和抗击穿场强更高,意味着在相同电场中能够分担大部分电场,降低铁电层中的电场,减小漏电流密度。
在本发明中,需要控制每一层HfO2膜层与ZrO2膜层的厚度在本发明范围内,单层HfO2膜层厚度可低至0.09nm,若选择此厚度,则制备的薄膜即为Hf0.5Zr0.5O2固溶体,并不存在HfO2层与ZrO2层之间的界面,因此界面所带来减小漏电流和提升疲劳性能的优势不复存在,而通过透射电镜发现,HfO2层与ZrO2层在边界处不可避免存在扩散(即掺杂),因此,厚度过薄,由会有扩散带来的影响,而将厚度控制在0.8nm及以上,能够使得扩散导致的过渡层占比相对较小,对铁电极化响应的影响相对来说就非常有限,从而整体上实现非掺杂,这种非掺杂式的叠层薄膜由于引入的界面能够有效阻碍“电树”的生长,并减小电子注入深度,抑制局部相分解,因此在降低漏电流,提升可靠性方面均存在优势。当然单层厚度也不能过大,若过大,则会因为表面能效应及应力夹持作用减弱,导致HfO2层中铁电相含量过低导致铁电性能不佳。
另外,Al2O3膜层的厚度也需要有效控制,若Al2O3层过薄则会充当掺杂元素进入接触的HfO2层,难以起到介质层分隔上下铁电HZO层以促进180°畴的形成的目的。若是过厚,则会使得上下HZO层“去耦合”,铁电响应减弱,导致薄膜剩余极化强度显著下降,如本发明中Al2O3为3nm时即开始出现了剩余极化下降的情况。
优选的方案,所述HZO底层中最上层与最下层均为HfO2膜层,所述HZO顶层中最上层与最下层均为HfO2膜层。
发明人发现,当与AO中层接触的均为HfO2膜层时,对薄膜铁电性能的提升更有利。
优选的方案,所述HZO顶层中,任意相邻相两层HfO2膜层与ZrO2膜层中的HfO2和ZrO2的摩尔比为1:1。
本发明一种HZO/AO/HZO纳米叠层薄膜的制备方法,包括如下步骤:采用原子层沉积技术于衬底表面交替地沉积HfO2膜层、ZrO2膜层获得HZO底层,然后于HZO底层表面沉积Al2O3膜层,然后再于Al2O3膜层的表面交替地沉积HfO2膜层、ZrO2膜层获得HZO顶层,随后退火,即得结晶良好的HZO/AO/HZO纳米叠层薄膜。
优选的方案,所述HZO底层的具体沉积过程为:将ALD腔体抽真空至10hPa以下,然后将ALD腔体升温至250-280℃,优选后为250℃,然后先脉冲一个循环的铪源,控制铪源的流量为120~150sccm,铪源脉冲的时间为1~3s,接着脉冲一个循环的氧化剂,控制氧化剂的流量为150~200sccm,氧化剂脉冲的时间为0.1~0.5s,反应生成HfO2,重复铪源与氧化剂的脉冲,共循环12次,获得第一层HfO2膜层,然后再脉冲一个循环锆源,控制锆源的流量为120~150sccm,锆源脉冲的时间为1~3s,接着脉冲一个循环的氧化剂,控制氧化剂的流量为150~200sccm,氧化剂脉冲的时间为0.1~0.5s,反应生成ZrO2,重复铪源与氧化剂的脉冲,共循环12次,获得第一层ZrO2膜层,然后重复HfO2膜层以及ZrO2膜层的交替沉积,至HfO2膜层为2~5层,优选为3~4层,即得HZO底层。
进一步的优选,所述HZO底层的沉积时,铪源选自四氯化铪、四-(甲乙胺基)铪、四-二甲氨基铪和四-二乙基氨基铪中的任意一种,锆源选自四氯化锆、四-(甲乙胺基)锆、四-二甲氨基锆和四-二乙基氨基锆中的任意一种,氧化剂选自水,臭氧、过氧化氢中的任意一种。
优选的方案,所述Al2O3膜层的具体沉积过程为:将ALD腔体抽真空至10hPa以下,然后将ALD腔体升温至200~250℃,优选后为250℃,然后先脉冲一个循环的铝源,控制铝源脉冲的流量为150~200sccm,脉冲的时间为0.1~0.5s,接着脉冲一个循环的氧化剂,控制氧化剂脉冲的流量为150~200sccm,脉冲的时间为0.1~0.5s,重复脉冲10~30个循环,优选为10个循环。
进一步的优选,所述铝源为三甲基铝,所述氧化剂选自水,臭氧、过氧化氢中的任意一种。
优选的方案,所述HZO顶层的具体沉积过程为:将ALD腔体抽真空至10hPa以下,然后将ALD腔体升温至250-280℃,优选后为250℃,然后先脉冲一个循环的铪源,控制铪源的流量为120~130sccm,铪源脉冲的时间为1.5~1.8s,接着脉冲一个循环的氧化剂,控制氧化剂的流量为130~160sccm,氧化剂脉冲的时间为0.1~0.2s,反应生成HfO2,重复铪源与氧化剂的脉冲,共循环12次,获得第一层HfO2膜层,然后再脉冲一个循环锆源,控制锆源的流量为120~130sccm,锆源脉冲的时间为1.5~1.8s,接着脉冲一个循环的氧化剂,控制氧化剂的流量为130~160sccm,氧化剂脉冲的时间为0.1~0.2s,反应生成ZrO2,重复铪源与氧化剂的脉冲,共循环12次,获得第一层ZrO2膜层,然后重复HfO2膜层以及ZrO2膜层的交替沉积,至HfO2膜层为2~5层,优选为3~4层,即得HZO顶层。
进一步的优选,所述HZO顶层的沉积时,铪源选自四氯化铪、四-(甲乙胺基)铪、四-二甲氨基铪和四-二乙基氨基铪中的任意一种,锆源选自四氯化锆、四-(甲乙胺基)锆、四-二甲氨基锆和四-二乙基氨基锆中的任意一种,氧化剂选自水,臭氧、过氧化氢中的任意一种。
在实际的原子层沉积过程中,完与一次脉冲循环后都需要通入氮气扫出多余气体以及副产物。
优选的方案,所述退火在保护气氛下进行,退火的温度为400~500℃,退火的时间为30~60s。
在实际操作过程中,将将沉积完成的HZO/AO/HZO叠层薄膜置于快速退火炉中于保护气氛中进行,保护气氛优选为N2。
本发明还提供一种HZO/AO/HZO纳米叠层薄膜的应用,将所述HZO/AO/HZO纳米叠层薄膜应用于铁电存储器。
在应用过程中,使用经过标准RCA清洗的p型单晶Si片作为基底;利用磁控溅射技术沉积TiN底电极及顶电极;使用原子层沉积技术沉积HZO/AO/HZO纳米叠层薄膜制备成金属-铁电层-金属(MFM)电容器结构。
原理与优势
利用上述制备方法制备出的(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n纳米叠层薄膜的元素分布均匀,退火后具有正交相结构,优化后的结构具有较好的矩形度,且剩余极化强度均≥15μC/cm2,最高可达24μC/cm2,与此相比,等摩尔比掺Zr的HfO2薄膜的剩余极化强度仅为10μC/cm2,未进行Al2O3插层的(HfO2/ZrO2)n薄膜的剩余极化强度仅为5μC/cm2;除此之外,(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n薄膜与电极之间的界面清晰,具有较小的漏电流密度(≤10-4A/cm2)。
本发明的优点如下:
(1)所制备薄膜元素分布均匀,退火后为正交相,剩余极化强度≥15μC/cm2;
(2)本发明利用多层薄膜堆叠所形成的界面阻止了电树的生长,提高了击穿电场,有效地降低了漏电流密度(≤10-4A/cm2);
(3)本发明利用Al2O3层调控薄膜的铁电性能,实现了漏电流问题和疲劳问题协同解决。
(4)本发明所述薄膜成分简单、可控,重复性好,能用于工业生产。
(5)本发明所述薄膜抗疲劳性能可达109循环以上
附图说明
图1为本发明(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n纳米叠层薄膜设计示意图;
图2为实施例1-2及对比例1-3所制备的(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n纳米叠层薄膜的GI-XRD图谱,表明薄膜具有正交相、单斜相、四方相等多种晶型;
图3为各实例的极化强度的测试结果图;
图4为实施例1所制备的(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n纳米叠层薄膜电容器的漏电流测试结果图;
图5为实施例1所制备的(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n纳米叠层薄膜的疲劳测试结果,表明其在109次循环后仍能继续工作。
具体实施方式
下面用具体实施例对本发明做进一步详细说明,但本发明不仅局限于以下具体实施例。
在以下实施例中,所用Si衬底先进行如下预处理:
沉积前需利用RCA标准清洗法对单晶Si衬底进行清洗,先利用丙酮和无水乙醇对Si片进行10min的超声清洗,清除Si上附着的有机污染物;利用SC-I(氨水:过氧化氢:水=1:1:5)和SC-II(氯化氢:过氧化氢:水=1:1:5)溶液在80℃下进行超声清洗10min,除去Si片表面的金属离子和颗粒;利用DHF(氟化氢:水=1:40)溶液浸泡Si片30s,以除去Si表面的氧化层SiO2。
实施例1
先利用磁控溅射技术在清洗后的Si片表面沉积60nm的TiN层。然后沉积在TiN上沉积(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n薄膜:
(1)将衬底置于反应腔中,置于ALD沉积腔体中,抽真空至10hPa,在各管路中通入N2作为保护气体,设置管路中载气流量为120sccm,沉积腔体温度为250℃,向反应腔体中通入气态四-(甲乙胺基)铪,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的铪前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成HfO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Hf源和水的循环共12次,获得厚度为1nm的HfO2膜层;(2)向反应腔体中通入气态四-(甲乙胺基)锆,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的锆前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成ZrO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Zr源和水的循环共12次,获得厚度为1nm的ZrO2膜层;继续采用上述工艺参数交替沉积获得HfO2膜层与ZrO2膜层,最终沉积HfO2膜层为4层,ZrO2膜层为3层的HZO底层(3)向反应腔体中通入气态三甲基铝,载气流量为150sccm,脉冲时间为0.1s;用高纯N2吹扫,去除多余的铝前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成Al2O3薄膜;用高纯N2吹扫掉多余的水和副产物;重复Al源和水的循环,直至Al2O3膜的厚度为1nm;(4)然后于Al2O3膜的表面,采用重复(1)和(2)过程,继续交替沉积HfO2膜层、ZrO2膜层,最终沉积获得具有单层厚度为1nm的HfO2膜层4层与单层厚度为1nm的ZrO2膜层3层的HZO顶层,即得3HZO-1AO-3HZO薄膜,再盖上掩模版,利用磁控溅射技术在薄膜顶部沉积30nm的TiN层和60nm的Au电极,制备成金属-铁电层-金属(MFM)电容器结构,将该结构置于快速退火炉中于进行450℃退火30s。
薄膜性能测试结果:
图2为3HZO-1AO-3HZO薄膜的GI-XRD图谱,如图所示薄膜为Pca21正交相结构,如图2所示。
通过上述MFM结构,测试薄膜的剩余极化强度和漏电流密度。结果表明,如图3所示,3HZO-1AO-3HZO薄膜的剩余极化强度为24μC/cm2,图4所示薄膜的漏电流密度≤10-4A/cm2,显示出了良好的铁电性能以及很小的漏电流。
图5所示为疲劳测试结果,可见(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n薄膜具有良好的抗疲劳性能,在109次循环后仍具有较大的存储窗口,可以继续工作。
实施例2
先利用磁控溅射技术在清洗后的Si片表面沉积60nm的TiN层。然后沉积在TiN上沉积(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n薄膜:
(1)将衬底置于反应腔中,置于ALD沉积腔体中,抽真空至10hPa,在各管路中通入N2作为保护气体,设置管路中载气流量为120sccm,沉积腔体温度为250℃,向反应腔体中通入气态四-(甲乙胺基)铪,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的铪前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成HfO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Hf源和水的循环共12次,获得厚度为1nm的HfO2膜层;(2)向反应腔体中通入气态四-(甲乙胺基)锆,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的锆前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成ZrO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Zr源和水的循环共12次,获得厚度为1nm的ZrO2膜层;继续采用上述工艺参数交替沉积获得HfO2膜层与ZrO2膜层,最终沉积HfO2膜层为4层,ZrO2膜层为3层的HZO底层(3)向反应腔体中通入气态三甲基铝,载气流量为150sccm,脉冲时间为0.1s;用高纯N2吹扫,去除多余的铝前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成Al2O3薄膜;用高纯N2吹扫掉多余的水和副产物;重复Al源和水的循环,直至Al2O3膜的厚度为2nm;(4)然后于Al2O3膜的表面,采用重复(1)和(2)过程,继续交替沉积HfO2膜层、ZrO2膜层,最终沉积获得具有单层厚度为1nm的HfO2膜层4层与单层厚度为1nm的ZrO2膜层3层的HZO顶层,即得3HZO-2AO-3HZO薄膜,再盖上掩模版,利用磁控溅射技术在薄膜顶部沉积30nm的TiN层和60nm的Au电极,制备成金属-铁电层-金属(MFM)电容器结构,将该结构置于快速退火炉中于进行450℃退火30s。
薄膜性能测试结果:
通过上述MFM结构,测试3HZO-2AO-3HZO薄膜的剩余极化强度和漏电流密度。结果表明,如图3所示,3HZO-2AO-3HZO薄膜的剩余极化强度为20μC/cm2,3HZO-2AO-3HZO薄膜的漏电流较3HZO-1AO-3HZO薄膜更低,其漏电流密度≤10-5A/cm2,显示出了较好的铁电性能以及很小的漏电流。
对比例1
薄膜的沉积过程基本同实施例1,仅是更改HZO中HfO2层和ZrO2层的数目,具体如下:
先利用磁控溅射技术在清洗后的Si片表面沉积60nm的TiN层。然后沉积在TiN上沉积(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n薄膜:
(1)将衬底置于反应腔中,置于ALD沉积腔体中,抽真空至10hPa,在各管路中通入N2作为保护气体,设置管路中载气流量为120sccm,沉积腔体温度为250℃,向反应腔体中通入气态四-(甲乙胺基)铪,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的铪前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成HfO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Hf源和水的循环共12次,获得厚度为1nm的HfO2膜层;(2)向反应腔体中通入气态四-(甲乙胺基)锆,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的锆前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成ZrO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Zr源和水的循环共12次,获得厚度为1nm的ZrO2膜层;继续采用上述工艺参数交替沉积获得HfO2膜层与ZrO2膜层,最终沉积HfO2膜层为6层,ZrO2膜层为5层的HZO底层;(3)向反应腔体中通入气态三甲基铝,载气流量为150sccm,脉冲时间为0.1s;用高纯N2吹扫,去除多余的铝前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成Al2O3薄膜;用高纯N2吹扫掉多余的水和副产物;重复Al源和水的循环,直至Al2O3膜的厚度为1nm;(4)然后于Al2O3膜的表面,采用重复(1)和(2)过程,继续交替沉积HfO2膜层、ZrO2膜层,最终沉积获得具有单层厚度为1nm的HfO2膜层6层与单层厚度为1nm的ZrO2膜层5层的HZO顶层,即得5HZO-1AO-5HZO薄膜,再盖上掩模版,利用磁控溅射技术在薄膜顶部沉积30nm的TiN层和60nm的Au电极,制备成金属-铁电层-金属(MFM)电容器结构,将该结构置于快速退火炉中于进行450℃退火30s。
薄膜性能测试结果:
GI-XRD结果表明5HZO-1AO-5HZO薄膜中较实施例1中的3HZO-1AO-3HZO薄膜有着更高的单斜相(非铁电相)含量;薄膜因较高的单斜相含量及增多的界面数目具有更低的漏电流;其薄膜剩余极化强度仅为9μC/cm2,下降了62.5%。
对比例2
薄膜的沉积过程基本同实施例1,仅是改变Al2O3沉积次数为30次,具体如下:
先利用磁控溅射技术在清洗后的Si片表面沉积60nm的TiN层。然后沉积在TiN上沉积(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n薄膜:
(1)将衬底置于反应腔中,置于ALD沉积腔体中,抽真空至10hPa,在各管路中通入N2作为保护气体,设置管路中载气流量为120sccm,沉积腔体温度为250℃,向反应腔体中通入气态四-(甲乙胺基)铪,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的铪前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成HfO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Hf源和水的循环共12次,获得厚度为1nm的HfO2膜层;(2)向反应腔体中通入气态四-(甲乙胺基)锆,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的锆前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成ZrO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Zr源和水的循环共12次,获得厚度为1nm的ZrO2膜层;继续采用上述工艺参数交替沉积获得HfO2膜层与ZrO2膜层,最终沉积HfO2膜层为4层,ZrO2膜层为3层的HZO底层;(3)向反应腔体中通入气态三甲基铝,载气流量为150sccm,脉冲时间为0.1s;用高纯N2吹扫,去除多余的铝前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成Al2O3薄膜;用高纯N2吹扫掉多余的水和副产物;重复Al源和水的循环,直至Al2O3膜的厚度为3nm;(4)然后于Al2O3膜的表面,采用重复(1)和(2)过程,继续交替沉积HfO2膜层、ZrO2膜层,最终沉积获得具有单层厚度为1nm的HfO2膜层4层与单层厚度为1nm的ZrO2膜层3层的HZO顶层,即得3HZO-3AO-3HZO薄膜,再盖上掩模版,利用磁控溅射技术在薄膜顶部沉积30nm的TiN层和60nm的Au电极,制备成金属-铁电层-金属(MFM)电容器结构,将该结构置于快速退火炉中于进行450℃退火30s。
薄膜性能测试结果:
GI-XRD结果表明3HZO-3AO-3HZO薄膜中较实施例1中的3HZO-1AO-3HZO薄膜,其正交相含量降低;薄膜剩余极化强度仅为15.5μC/cm2,下降了35.4%;3HZO-3AO-3HZO薄膜因为较厚的Al2O3层具有更低的漏电流。
对比例3
薄膜的沉积过程基本同实施例1,仅是改变Al2O3沉积次数为0次,具体如下:
先利用磁控溅射技术在清洗后的Si片表面沉积60nm的TiN层。然后沉积在TiN上沉积(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n薄膜:
(1)将衬底置于反应腔中,置于ALD沉积腔体中,抽真空至10hPa,在各管路中通入N2作为保护气体,设置管路中载气流量为120sccm,沉积腔体温度为250℃,向反应腔体中通入气态四-(甲乙胺基)铪,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的铪前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成HfO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Hf源和水的循环共12次,获得厚度为1nm的HfO2膜层;(2)向反应腔体中通入气态四-(甲乙胺基)锆,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的锆前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成ZrO2薄膜;用高纯N2吹扫掉多余的水和副产物;重复Zr源和水的循环共12次,获得厚度为1nm的ZrO2膜层;继续采用上述工艺参数交替沉积获得HfO2膜层与ZrO2膜层,最终沉积HfO2膜层为4层,ZrO2膜层为3层的HZO底层;(3)不再沉积Al2O3膜层;(4)然后于HZO底层的表面,采用重复(1)和(2)过程,继续交替沉积HfO2膜层、ZrO2膜层,最终沉积获得具有单层厚度为1nm的HfO2膜层4层与单层厚度为1nm的ZrO2膜层3层的HZO顶层,即得3HZO-0AO-3HZO薄膜,再盖上掩模版,利用磁控溅射技术在薄膜顶部沉积30nm的TiN层和60nm的Au电极,制备成金属-铁电层-金属(MFM)电容器结构,将该结构置于快速退火炉中于进行450℃退火30s。
薄膜性能测试结果:
GI-XRD结果表明3HZO-0AO-3HZO薄膜具有单斜相的衍射峰;薄膜剩余极化强度仅为5μC/cm2,相较3HZO-1AO-3HZO薄膜下降了79.2%;3HZO-0AO-3HZO薄膜由于没有介质层Al2O3的存在,漏电流明显提高。
对比例4
薄膜的沉积过程基本同实施例1,仅是改变HfO2层、ZrO2层单层厚度及循环次数变化以保持HZO层厚度一致,具体如下:
先利用磁控溅射技术在清洗后的Si片表面沉积60nm的TiN层。然后沉积在TiN上沉积(HfO2/ZrO2)n/Al2O3/(HfO2/ZrO2)n薄膜:
(1)将衬底置于反应腔中,置于ALD沉积腔体中,抽真空至10hPa,在各管路中通入N2作为保护气体,设置管路中载气流量为120sccm,沉积腔体温度为250℃,向反应腔体中通入气态四-(甲乙胺基)铪,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的铪前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成HfO2薄膜;用高纯N2吹扫掉多余的水和副产物;不再重复Hf源和水的循环,获得厚度为0.09nm的HfO2膜层;(2)向反应腔体中通入气态四-(甲乙胺基)锆,载气流量为120sccm,脉冲时间为1.6s;用高纯N2吹扫,去除多余的锆前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成ZrO2薄膜;用高纯N2吹扫掉多余的水和副产物;不再重复Zr源和水的循环,获得厚度为0.09nm的ZrO2膜层;继续采用上述工艺参数交替沉积获得HfO2膜层与ZrO2膜层,最终沉积HfO2膜层为39层,ZrO2膜层为38层的Hf0.5Zr0.5O2底层;(3)向反应腔体中通入气态三甲基铝,载气流量为150sccm,脉冲时间为0.1s;用高纯N2吹扫,去除多余的铝前驱体;向反应腔体中通入气态水,载气流量为150sccm,脉冲时间为0.1s,利用热反应生成Al2O3薄膜;用高纯N2吹扫掉多余的水和副产物;重复Al源和水的循环,直至Al2O3膜的厚度为3nm;(4)然后于Al2O3膜的表面,采用重复(1)和(2)过程,继续交替沉积HfO2膜层、ZrO2膜层,最终沉积获得具有单层厚度为0.09nm的HfO2膜层39层与单层厚度为0.09nm的ZrO2膜层38层的Hf0.5Zr0.5O2顶层,即得Hf0.5Zr0.5O2/Al2O3/Hf0.5Zr0.5O2薄膜,再盖上掩模版,利用磁控溅射技术在薄膜顶部沉积30nm的TiN层和60nm的Au电极,制备成金属-铁电层-金属(MFM)电容器结构,将该结构置于快速退火炉中于进行450℃退火30s。
薄膜性能测试结果:
漏电流测试结果表明Hf0.5Zr0.5O2/Al2O3/Hf0.5Zr0.5O2薄膜中较实施例1中的3HZO-1AO-3HZO薄膜提高了2~3个数量级;薄膜疲劳测试结果表明其在105次循环后开始出现明显的疲劳效应,在106次循环后存储窗口明显减小,无法继续工作。其剩余极化强度为15μC/cm2。
Claims (9)
1.一种HZO/AO/HZO纳米叠层薄膜,其特征在于:所述薄膜由HZO顶层、AO中层、HZO底层构成,其中HZO顶层由HfO2膜层与ZrO2膜层交替层叠组成,AO中层为Al2O3膜层,HZO底层由HfO2膜层与ZrO2膜层交替层叠组成;所述HZO顶层中任意一层HfO2膜层的厚度为0.8~1.5nm,所述HZO顶层中任意一层ZrO2膜层的厚度为0.8~1.5nm,所述HZO顶层中,HfO2膜层的层数为2~5层;所述Al2O3膜层的厚度为1~2nm,所述HZO底层中任意一层HfO2膜层的厚度为0.8~1.5nm,所述HZO底层中任意一层ZrO2膜层的厚度为0.8~1.5nm,所述HZO底层中,HfO2膜层的层数为2~5层。
2.根据权利要求1所述的一种HZO/AO/HZO纳米叠层薄膜,其特征在于:所述HZO底层中最上层与最下层均为HfO2膜层,所述HZO顶层中最上层与最下层均为HfO2膜层。
3.根据权利要求1所述的一种HZO/AO/HZO纳米叠层薄膜,其特征在于:所述HZO顶层中,任意相邻相两层HfO2膜层与ZrO2膜层中的HfO2和ZrO2的摩尔比为1:1。
4.根据权利要求1-3任意一项所述的一种HZO/AO/HZO纳米叠层薄膜的制备方法,其特征在于:包括如下步骤:采用原子层沉积技术于衬底表面交替地沉积HfO2膜层、ZrO2膜层获得HZO底层,然后于HZO底层表面沉积Al2O3膜层,然后再于Al2O3膜层的表面交替地沉积HfO2膜层、ZrO2膜层获得HZO顶层,随后退火,即得HZO/AO/HZO纳米叠层薄膜。
5.根据权利要求4所述的一种HZO/AO/HZO纳米叠层薄膜的制备方法,其特征在于:所述HZO底层的具体沉积过程为:将ALD腔体抽真空至10hPa以下,然后将ALD腔体升温至250-280℃,然后先脉冲一个循环的铪源,控制铪源的流量为120~150sccm,铪源脉冲的时间为1~3s,接着脉冲一个循环的氧化剂,控制氧化剂的流量为150~200sccm,氧化剂脉冲的时间为0.1~0.5s,反应生成HfO2,重复铪源与氧化剂的脉冲,共循环12次,获得第一层HfO2膜层,然后再脉冲一个循环锆源,控制锆源的流量为120~150sccm,锆源脉冲的时间为1~3s,接着脉冲一个循环的氧化剂,控制氧化剂的流量为150~200sccm,氧化剂脉冲的时间为0.1~0.5s,反应生成ZrO2,重复铪源与氧化剂的脉冲,共循环12次,获得第一层ZrO2膜层,然后重复HfO2膜层以及ZrO2膜层的交替沉积,至HfO2膜层为2~5层,即得HZO底层;
所述HZO底层的沉积时,铪源选自四氯化铪、四-(甲乙胺基)铪、四-二甲氨基铪和四-二乙基氨基铪中的任意一种,锆源选自四氯化锆、四-(甲乙胺基)锆、四-二甲氨基锆和四-二乙基氨基锆中的任意一种,氧化剂选自水,臭氧、过氧化氢中的任意一种。
6.根据权利要求4所述的一种HZO/AO/HZO纳米叠层薄膜的制备方法,其特征在于:所述Al2O3膜层的具体沉积过程为:将ALD腔体抽真空至10hPa以下,然后将ALD腔体升温至200~250℃,然后先脉冲一个循环的铝源,控制铝源脉冲的流量为150~200sccm,脉冲的时间为0.1~0.5s,接着脉冲一个循环的氧化剂,控制氧化剂脉冲的流量为150~200sccm,脉冲的时间为0.1~0.5s,重复脉冲10~30个循环,优选为10个循环;
所述铝源为三甲基铝,所述氧化剂选自水,臭氧、过氧化氢中的任意一种。
7.根据权利要求4所述的一种HZO/AO/HZO纳米叠层薄膜的制备方法,其特征在于:所述HZO顶层的具体沉积过程为:将ALD腔体抽真空至10hPa以下,然后将ALD腔体升温至250-280℃,然后先脉冲一个循环的铪源,控制铪源的流量为120~130sccm,铪源脉冲的时间为1.5~1.8s,接着脉冲一个循环的氧化剂,控制氧化剂的流量为130~160sccm,氧化剂脉冲的时间为0.1~0.2s,反应生成HfO2,重复铪源与氧化剂的脉冲,共循环12次,获得第一层HfO2膜层,然后再脉冲一个循环锆源,控制锆源的流量为120~130sccm,锆源脉冲的时间为1.5~1.8s,接着脉冲一个循环的氧化剂,控制氧化剂的流量为130~160sccm,氧化剂脉冲的时间为0.1~0.2s,反应生成ZrO2,重复铪源与氧化剂的脉冲,共循环12次,获得第一层ZrO2膜层,然后重复HfO2膜层以及ZrO2膜层的交替沉积,至HfO2膜层为2~5层,优选为3~4层,即得HZO顶层;
所述HZO顶层的沉积时,铪源选自四氯化铪、四-(甲乙胺基)铪、四-二甲氨基铪和四-二乙基氨基铪中的任意一种,锆源选自四氯化锆、四-(甲乙胺基)锆、四-二甲氨基锆和四-二乙基氨基锆中的任意一种,氧化剂选自水,臭氧、过氧化氢中的任意一种。
8.根据权利要求4所述的一种HZO/AO/HZO纳米叠层薄膜的制备方法,其特征在于:所述退火在保护气氛下进行,退火的温度为400-500℃,退火的时间为30-60s。
9.根据权利要求1-3任意一项所述的根据权利要求4所述的一种HZO/AO/HZO纳米叠层薄膜的应用,其特征在于:将所述HZO/AO/HZO纳米叠层薄膜应用于铁电存储器。
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