WO2014059686A1 - FinFET鳍状结构的制造方法 - Google Patents

FinFET鳍状结构的制造方法 Download PDF

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Publication number
WO2014059686A1
WO2014059686A1 PCT/CN2012/083475 CN2012083475W WO2014059686A1 WO 2014059686 A1 WO2014059686 A1 WO 2014059686A1 CN 2012083475 W CN2012083475 W CN 2012083475W WO 2014059686 A1 WO2014059686 A1 WO 2014059686A1
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dielectric layer
fin structure
layer
opening
silicon
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French (fr)
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尹海洲
蒋葳
朱慧珑
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Institute of Microelectronics of CAS
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D62/00Semiconductor bodies, or regions thereof, of devices having potential barriers
    • H10D62/10Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
    • H10D62/124Shapes, relative sizes or dispositions of the regions of semiconductor bodies or of junctions between the regions
    • H10D62/126Top-view geometrical layouts of the regions or the junctions
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10DINORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D30/00Field-effect transistors [FET]
    • H10D30/01Manufacture or treatment
    • H10D30/021Manufacture or treatment of FETs having insulated gates [IGFET]
    • H10D30/024Manufacture or treatment of FETs having insulated gates [IGFET] of fin field-effect transistors [FinFET]
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10PGENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P14/00Formation of materials, e.g. in the shape of layers or pillars
    • H10P14/20Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
    • H10P14/38Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by treatments done after the formation of the materials
    • H10P14/3802Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10PGENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P14/00Formation of materials, e.g. in the shape of layers or pillars
    • H10P14/60Formation of materials, e.g. in the shape of layers or pillars of insulating materials
    • H10P14/69Inorganic materials
    • H10P14/692Inorganic materials composed of oxides, glassy oxides or oxide-based glasses
    • H10P14/6921Inorganic materials composed of oxides, glassy oxides or oxide-based glasses containing silicon
    • H10P14/69215Inorganic materials composed of oxides, glassy oxides or oxide-based glasses containing silicon the material being a silicon oxide, e.g. SiO2
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10PGENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P14/00Formation of materials, e.g. in the shape of layers or pillars
    • H10P14/60Formation of materials, e.g. in the shape of layers or pillars of insulating materials
    • H10P14/69Inorganic materials
    • H10P14/694Inorganic materials composed of nitrides
    • H10P14/6943Inorganic materials composed of nitrides containing silicon
    • H10P14/69433Inorganic materials composed of nitrides containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10PGENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P52/00Grinding, lapping or polishing of wafers, substrates or parts of devices
    • H10P52/40Chemomechanical polishing [CMP]
    • H10P52/402Chemomechanical polishing [CMP] of semiconductor materials
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10PGENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P95/00Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
    • H10P95/06Planarisation of inorganic insulating materials
    • H10P95/062Planarisation of inorganic insulating materials involving a dielectric removal step
    • H10P95/064Planarisation of inorganic insulating materials involving a dielectric removal step the removal being chemical etching

Definitions

  • the present invention relates to semiconductor fabrication techniques, and more particularly to a method of fabricating a FinFET fin structure. Background technique
  • FinFET fin field effect transistor
  • the conventional process flow is as shown in FIG. 1(a) to FIG. 1(c), including: providing a substrate; removing a part of the substrate to form a fin structure; and forming an insulating dielectric layer of the isolated fin structure.
  • the step of forming the isolation dielectric layer includes: depositing an insulating dielectric layer; performing chemical mechanical polishing (CMP) to stop at the top of the fin structure; etching a portion of the insulating dielectric layer to expose the fin structure to a certain height. Since there is no etch stop, the etch stop can only be controlled by time. There are some differences in the etching rates at different positions on the silicon wafer.
  • the etching rates of different silicon wafers may also differ, resulting in a certain difference in the height of the fin structure exposing the isolation dielectric layer, which directly affects the FinFET.
  • the gate width ultimately results in some differences in device performance on different silicon wafers and on different locations on the silicon, which is not conducive to large-scale integration and mass production of devices. Summary of the invention
  • An object of the present invention is to provide a method for fabricating a FinFET fin structure, which is formed by forming a multilayer film and controlling the height of the fin structure by using a film thickness, so that the height of the fin structure exposed outside the insulating layer is substantially Consistent.
  • a method of fabricating a FinFET fin structure comprising the steps of:
  • the present invention controls the height of the fin structure in the FinFET by forming a first dielectric layer and a second dielectric layer and utilizing the thickness of the second dielectric layer. Since the thickness of the formed film is relatively uniform, and the thickness can be controlled by measurement. By using the etching selectivity between different materials, the etching stop can be well controlled, and the etching uniformity can be better achieved than the time control.
  • the height of the fin structures formed by the above method is substantially uniform, thereby ensuring uniformity of device performance on different silicon wafers and at different positions on the silicon wafer.
  • FIG. 1(a) to 1(c) are schematic cross-sectional views showing various stages of manufacturing a FinFET fin structure of the prior art
  • FIG. 2 is a flow chart of a method of fabricating a FinFET fin structure in accordance with the present invention
  • 3(a) through 3(d) are cross-sectional schematic views of various stages of fabricating a FinFET fin structure in accordance with the flow of FIG. 2 in accordance with a preferred embodiment of the present invention.
  • the same or similar reference numerals in the drawings represent the same or similar components. detailed description
  • step S101 a substrate 200 is provided.
  • the substrate 200 includes a silicon substrate (e.g., a silicon wafer).
  • the substrate 200 can include various doped configurations in accordance with design requirements well known in the art (e.g., a P-type substrate or an N-type substrate).
  • the substrate 200 in other embodiments may also include other basic semiconductors such as germanium.
  • substrate 200 may comprise a compound semiconductor (e.g., a Group III-V material) such as silicon carbide, gallium arsenide, indium arsenide.
  • substrate 200 can have, but is not limited to, a thickness of about a few hundred microns, such as can range from 400 um to 800 um.
  • a first dielectric layer 210 is formed on the substrate 200.
  • the first dielectric layer 210 may be formed by chemical vapor deposition (CVD), plasma enhanced CVD, high density plasma CVD, spin coating, and/or other suitable processes.
  • the material of the first dielectric layer 210 may include silicon oxide, silicon oxynitride, combinations thereof, and/or other suitable isolation materials.
  • the thickness of the first dielectric layer 210 is the last formed device isolation The thickness of the dielectric layer may range, for example, from 100 to 500 nm.
  • a second dielectric layer 220 is formed on the first dielectric layer 210, and the material of the second dielectric layer 220 adjacent to the first dielectric layer is The first dielectric layer 210 is different.
  • the second dielectric layer 220 may be a single layer or a multilayer structure. When the second dielectric layer 220 is of a multi-layered structure, the material of the sub-layer closest to the first dielectric layer is different from the material of the underlying first dielectric layer.
  • the layers of the second dielectric layer 220 may be formed by methods such as chemical vapor deposition (CVD), plasma enhanced CVD, high density plasma CVD, spin coating, and/or other suitable processes.
  • the second dielectric layer 220 may include a three-layer thin film, which is a silicon nitride layer, a silicon oxide layer, and a silicon nitride layer in order from bottom to top.
  • the silicon nitride layer may have a thickness of 5-10 nm, and the uppermost layer, the lowermost silicon nitride layer ensures selectivity with respect to the underlying first dielectric layer when etching the second dielectric layer.
  • the thickness of the silicon oxide layer may range, for example, from 100 to 500 nm for controlling the height of the fin structure to be formed.
  • the second dielectric layer 220 may be a single-layer silicon nitride film, which can serve as a barrier layer for chemical mechanical polishing, and can also ensure selectivity with respect to the underlying first dielectric layer when etching the second dielectric layer.
  • the thickness of the single-layer silicon nitride film may range, for example, from 100 to 500 nm for controlling the height of the fin structure to be formed.
  • step S104 an opening 230 is formed through the second dielectric layer 220 and the first dielectric layer 210, the opening 230 partially exposing the substrate 200.
  • the second dielectric layer 220 is etched first, and then the first dielectric layer 210 is etched until the substrate 200 is exposed to form the opening 230.
  • the second dielectric layer 220 is covered with a photoresist layer (not shown), and exposed to develop a photoresist pattern, and the photoresist pattern is used as a mask by dry etching such as plasma etching.
  • the second dielectric layer 220 and the first dielectric layer 210 are anisotropically etched.
  • the dry etching process gas includes sulfur hexafluoride (SF 6 ), hydrogen bromide (HBr), hydrogen iodide ( ⁇ ), chlorine, argon, helium, decane (and chlorodecane), acetylene, ethylene, etc. Carbon hydrides and combinations thereof, and/or other suitable materials.
  • the width of the opening is the width of the finally formed fin structure, which may range, for example, from 10 to 50 nm.
  • the opening 230 is filled with a semiconductor material.
  • the semiconductor material can be doped or undoped single crystal silicon.
  • the method of filling the opening 230 may be epitaxial growth. In-situ doping may be performed while epitaxial growth, or may be performed by ion implantation and annealing after epitaxial growth. For NMOS, the semiconductor material can be P-type doped; for PMOS, the semiconductor material can be N-type doped.
  • amorphous silicon may be deposited in the opening 230, and then the amorphous silicon is crystallized by an annealing process to form single crystal silicon.
  • Annealing can be carried out by other suitable methods including rapid annealing, spike annealing, and the like.
  • the semiconductor material may be subjected to chemical mechanical polishing (CMP) and stopped on the chemical mechanical polishing barrier layer such that the upper surface of the semiconductor material is flush with the upper surface of the second dielectric layer 220.
  • CMP chemical mechanical polishing
  • the second dielectric layer 220 is removed to form a fin structure 240.
  • the second dielectric layer 220 can be removed using wet etching and/or dry etching.
  • the wet etching process includes hot phosphoric acid (H 3 P0 4 ), dilute hydrofluoric acid (DHF) or other suitable etching solution; dry etching process includes sulfur hexafluoride (SF 6 ), hydrogen bromide (HBr) ), hydrogen iodide (HI), chlorine, argon, helium, decane (and chlorodecane), hydrides of carbon such as acetylene, ethylene, and combinations thereof, and/or other suitable materials.
  • H 3 P0 4 hot phosphoric acid
  • DHF dilute hydrofluoric acid
  • dry etching process includes sulfur hexafluoride (SF 6 ), hydrogen bromide (HBr) ), hydrogen iodide (HI), chlorine, argon, helium, decane (and chlorodecan
  • an etching method and/or an etching gas having a high etching selectivity may be selected, so that the etching is accurately stopped.
  • the uniformity of the height of the fin structure exposing the isolation dielectric layer over the entire wafer surface can be precisely controlled.

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  • Chemical & Material Sciences (AREA)
  • Element Separation (AREA)
  • Insulated Gate Type Field-Effect Transistor (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)

Abstract

一种FinFET鳍状结构(240)的制造方法,包括:提供衬底(200);形成第一介质层(210);形成第二介质层(220),第二介质层(220)与第一介质层相邻部分的材料与第一介质层(210)不同;形成贯穿第二介质层(220)和第一介质层(210)的开口(230),开口(230)暴露部分衬底:在开口(230)中填充半导体材料;去除第二介质层(220),形成鳍状结构(240)。通过介质层的厚度来控制FinFET中鳍状结构的高度,利用不同材料之间的刻蚀选择性,控制刻蚀的停止,相比通过时间进行控制可以更好地实现刻蚀均匀性。

Description

FinFET鳍状结构的制造方法
[0001]本申请要求了 2012年 10月 18日提交的、 申请号为 201210395585.2、 发明名称为" FinFET鳍状结构的制造方法 "的中国专利申请的优先权,其全部 内容通过引用结合在本申请中。 技术领域
[0002]本发明涉及半导体制造技术, 尤其涉及一种 FinFET鳍状结构的制 造方法。 背景技术
[0003】随着半导体技术的发展, 为了满足晶体管更快速的需求, 需要较高 的驱动电流。 由于晶体管的驱动电流正比于晶体管的栅极宽度, 为了提 高驱动电流, 需要较大的栅极宽度。 然而, 增加栅极宽度与半导体元件 缩小化的需求互相沖突, 于是发展出一种新型三维结构晶体管——鳍式 场效应晶体管 (FinFET ) 。 在 FinFET结构中, 栅极形成在垂直衬底的鳍 状结构上。通过栅极的控制, 可以在鳍状结构两侧形成导电沟道。 FinFET 的优点包括抑制短沟道效应 (SCE ) 、 提高驱动电流以及降低泄漏电流。
[0004]目前 FinFET在制造方面仍然存在许多问题。 传统的工艺流程如图 1(a)至图 1 (c)所示, 包括: 提供衬底; 去除部分衬底形成鳍状结构; 形成 隔离鳍状结构的绝缘介质层。 通常, 形成隔离介质层的步骤包括: 沉积 绝缘介质层; 进行化学机械抛光(CMP )停止在鳍状结构顶部; 刻蚀部 分绝缘介质层使鳍状结构暴露出一定高度。 由于不存在刻蚀阻挡层, 只 能通过时间来控制刻蚀停止。 硅片上不同位置的刻蚀速率存在一定差异, 不同硅片的刻蚀速率也会存在一定差异, 从而造成暴露出隔离介质层的 鳍状结构的高度存在一定差异, 这就直接影响了 FinFET的栅极宽度, 最 终导致不同硅片上以及硅片上不同位置的器件性能存在一定差异, 不利 于器件的大规模集成和批量生产。 发明内容
[0005]本发明的目的是提供一种 FinFET鳍状结构的制造方法, 通过形成 多层薄膜, 并利用薄膜厚度来控制鳍状结构的高度, 使暴露在绝缘层外 部的鳍状结构的高度基本一致。
[0006】根据本发明的一个方面, 提供一种 FinFET鳍状结构的制造方法, 该方法包括以下步骤:
a) 提供衬底;
b) 形成第一介质层;
c) 形成第二介质层, 所述第二介质层与第一介质层相邻部分的材料与第 一介质层不同;
d) 形成贯穿所述第二介质层和第一介质层的开口, 所述开口部分暴露所 述衬底;
e) 在所述开口中填充半导体材料;
f) 去除第二介质层, 形成鳍状结构。
[0007]本发明通过形成第一介质层和第二介质层,并利用第二介质层的厚 度来控制 FinFET中鳍状结构的高度。 由于形成薄膜的厚度比较均匀, 并 且厚度可以通过测量来控制。 利用不同材料之间的刻蚀选择性, 可以很 好的控制刻蚀停止, 相比于时间控制可以更好的实现刻蚀均勾性。 采用 上述方法形成的鳍状结构的高度基本一致, 从而保证了不同硅片上以及 硅片上不同位置的器件性能的一致性。 附图说明
[0008]通过阅读参照以下附图所作的对非限制性实施例所作的详细描述, 本发明的其它特征、 目的和优点将会变得更明显:
[0009】图 1(a)至图 1(c)为现有技术的制造 FinFET鳍状结构的各个阶段的 剖面示意图;
[0010]图 2为根据本发明的 FinFET鳍状结构制造方法的流程图;
[0011]图 3(a)至图 3(d)为根据本发明的一个优选实施例按照图 2所示流程 制造 FinFET鳍状结构的各个阶段的剖面示意图。 [0012]附图中相同或相似的附图标记代表相同或相似的部件。 具体实施方式
[0013]下面详细描述本发明的实施例, 所述实施例的示例在附图中示出。 下面通过参考附图描述的实施例是示例性的, 仅用于解释本发明, 而不 能解释为对本发明的限制。
[0014]下文的公开提供了许多不同的实施例或例子用来实现本发明的不 同结构。 为了筒化本发明的公开, 下文中对特定例子的部件和设置进行 描述。 当然, 它们仅仅为示例, 并且目的不在于限制本发明。 此外, 本 发明可以在不同例子中重复参考数字和 /或字母。 这种重复是为了筒化和 清楚的目的, 其本身不指示所讨论各种实施例和 /或设置之间的关系。 此 外, 本发明提供了各种特定的工艺和材料的例子, 但是本领域技术人员 可以意识到其他工艺的可应用性和 /或其他材料的使用。 应当注意, 在附 图中所图示的部件不一定按比例绘制。 本发明省略了对公知组件和处理 技术及工艺的描述以避免不必要地限制本发明。
[0015]下面, 将结合图 3(a)至图 3(d)对图 2中形成 FinFET鳍状结构的方 法进行具体地描述。
[0016]参考图 2和图 3(a), 在步骤 S101中, 提供衬底 200。
[0017]在本实施例中, 衬底 200包括硅衬底(例如硅晶片)。 根据现有技术 公知的设计要求 (例如 P型衬底或者 N型衬底),衬底 200可以包括各种掺 杂配置。 其他实施例中衬底 200还可以包括其他基本半导体, 例如锗。 或者, 衬底 200可以包括化合物半导体(如 III- V族材料) , 例如碳化硅、 砷化镓、 砷化铟。 典型地, 衬底 200 可以具有但不限于约几百微米的厚 度, 例如可以在 400um- 800um的厚度范围内。
[0018]参考图 2和图 3(a), 在步骤 S102中, 在衬底 200上形成第一介质 层 210。 所述第一介质层 210可以通过化学气相沉淀 (CVD)、 等离子体增 强 CVD、 高密度等离子体 CVD、 旋涂和 /或其他合适的工艺等方法形成。 所述第一介质层 210的材料可以包括氧化硅、 氮氧化硅及其组合, 和 /或 其他合适的隔离材料。 所述第一介质层 210 的厚度为最后形成的器件隔 离介质层的厚度, 其范围例如可以是 100-500nm。
[0019】参考图 2和图 3(a) , 在步骤 S103中, 在第一介质层 210上形成第 二介质层 220 ,所述第二介质层 220与第一介质层相邻部分的材料与第一 介质层 210不同。 所述第二介质层 220可以是单层或者多层结构。 当第 二介质层 220 为多层结构时, 其最靠近第一介质层的子层的材料与下方 的第一介质层的材料不同。 所述第二介质层 220 的各层薄膜可以通过化 学气相沉淀 (CVD)、 等离子体增强 CVD、 高密度等离子体 CVD、 旋涂和 / 或其他合适的工艺等方法形成。 例如, 如果第一介质层的材料是氧化硅, 则所述第二介质层 220 可以包括三层薄膜, 从下到上依次为氮化硅层、 氧化硅层和氮化硅层。 其中, 所述氮化硅层的厚度可以为 5-10nm, 最上 层, 最下层氮化硅层保证了刻蚀第二介质层时相对于下方的第一介质层 的选择性。 所述氧化硅层的厚度范围例如可以是 100-500nm, 用于控制要 形成的鳍状结构的高度。 或者, 所述第二介质层 220 可以为单层氮化硅 薄膜, 既可以作为化学机械抛光的阻挡层, 又可以保证刻蚀第二介质层 时相对于下方的第一介质层的选择性。 单层氮化硅薄膜厚度范围例如可 以是 100-500nm, 用于控制要形成的鳍状结构的高度。
[0020]参考图 2和图 3(b) ,在步骤 S104中,形成贯穿所述第二介质层 220 和第一介质层 210的开口 230, 所述开口 230部分暴露所述衬底 200。 在 本实施例中, 先刻蚀第二介质层 220 , 再刻蚀第一介质层 210 , 直至暴露 衬底 200 , 形成开口 230。 刻蚀之前先在第二介质层 220上覆盖一层光刻 胶层 (未示出) , 并曝光显影形成光刻胶图形, 以光刻胶图形为掩膜采 用等离子刻蚀等干法刻蚀, 各向异性地刻蚀第二介质层 220 和第一介质 层 210。干法刻蚀工艺气体包括六氟化硫 (SF6)、溴化氢 (HBr)、碘化氢 (ΗΙ)、 氯、 氩、 氦、 曱烷(及氯代曱烷) 、 乙炔、 乙烯等碳的氢化物及其组合, 和 /或其他合适的材料。 开口宽度为最后形成的鳍状结构的宽度, 其范围 例如可以是 10-50nm。
[0021】参考图 2和图 3(c) , 在步骤 S105中, 在所述开口 230中填充半导 体材料。 所述半导体材料可以为掺杂或非掺杂的单晶硅。 在一个实施例 中, 填充所述开口 230 的方法可以为外延生长。 可以在外延生长的同时 进行原位掺杂, 也可以在外延生长之后通过离子注入和退火的方式进行 掺杂。 对于 NMOS , 所述半导体材料可以为 P型掺杂; 对于 PMOS , 所 述半导体材料可以为 N型掺杂。 在另一个实施例中, 若衬底为单晶硅, 可以在开口 230 中沉积非晶硅, 然后通过退火工艺使非晶硅结晶从而形 成单晶硅。 退火可以采用包括快速退火、 尖峰退火等其他合适的方法实 施。 填充所述半导体材料后, 可以对所述半导体材料进行化学机械抛光 (CMP) , 并停止在化学机械抛光阻挡层上, 使所述半导体材料的上表面与 第二介质层 220的上表面齐平(本文件内, 术语"齐平"意指两者之间的高 度差在工艺误差允许的范围内)。
[0022】参考图 2和图 3(d) , 在步骤 S106中, 去除第二介质层 220, 形成 鳍状结构 240。 可以使用湿法刻蚀和 /或干法刻蚀的方式去除第二介质层 220。 湿法刻蚀工艺包括热磷酸 (H3P04)、 稀释氢氟酸 (DHF)或者其他合适 刻蚀的溶液;干法刻蚀工艺包括六氟化硫 (SF6)、溴化氢 (HBr)、碘化氢 (HI)、 氯、 氩、 氦、 曱烷(及氯代曱烷) 、 乙炔、 乙烯等碳的氢化物及其组合, 和 /或其他合适的材料。 由于第二介质层 220与第一介质层相邻部分的材 料与第一介质层 210 不同, 因此可以选择具有高刻蚀选择性的刻蚀方法 和 /或刻蚀气体, 使得刻蚀精确地停止在第一介质层的表面处。 从而可以 精确控制暴露出隔离介质层的鳍状结构的高度在整个晶圓表面的均匀 性。
[0023]虽然关于示例实施例及其优点已经详细说明,应当理解在不脱离本 发明的精神和所附权利要求限定的保护范围的情况下, 可以对这些实施 例进行各种变化、 替换和修改。 对于其他例子, 本领域的普通技术人员 应当容易理解在保持本发明保护范围内的同时, 工艺步骤的次序可以变 化。
[0024】此外,本发明的应用范围不局限于说明书中描述的特定实施例的工 艺、 机构、 制造、 物质组成、 手段、 方法及步骤。 从本发明的公开内容, 作为本领域的普通技术人员将容易地理解, 对于目前已存在或者以后即 将开发出的工艺、 机构、 制造、 物质组成、 手段、 方法或步骤, 其中它 们执行与本发明描述的对应实施例大体相同的功能或者获得大体相同的 结果, 依照本发明可以对它们进行应用。 因此, 本发明所附权利要求旨 在将这些工艺、 机构、 制造、 物质组成、 手段、 方法或步骤包含在其保 护范围内。

Claims

权 利 要 求
1. 一种 FinFET鳍状结构的制造方法, 该方法包括以下步骤: a) 提供衬底 (200);
b) 形成第一介质层 (210);
c) 形成第二介质层 (220) , 所述第二介质层 (220) 与第一介质层相邻 部分的材料与第一介质层 (210)不同;
d) 形成贯穿所述第二介质层 (220)和第一介质层 (210)的开口(230) ,所 述开口(230)部分暴露所述衬底;
e) 在所述开口(230)中填充半导体材料;
f) 去除第二介质层 (220) , 形成鳍状结构 (240)。
2. 根据权利要求 1 所述的方法, 其中, 在所述步骤 b ) 中, 所述第 一介质层 (210)的材料包括氧化硅。
3. 根据权利要求 1或 2所述的方法, 其中, 所述第一介质层 (210)的 厚度为最后形成的器件隔离介质层的厚度, 其范围是 100-500nm。
4. 根据权利要求 1 所述的方法, 其中, 在所述步骤 c ) 中, 所述第 二介质层 (220)的顶部包括化学机械抛光阻挡层。
5. 根据权利要求 1或 4所述的方法, 其中, 所述第二介质层 (220)包 括三层薄膜, 从下到上依次为氮化硅层、 氧化硅层和氮化硅层。
6. 根据权利要求 5 所述的方法, 其中, 所述氮化硅层的厚度为 5-10nm。
7. 根据权利要求 5所述的方法, 其中, 所述氧化硅层的厚度为暴露 出的鳍状结构的高度, 其范围是 100-500nm。
8. 根据权利要求 1 所述的方法, 其中, 在所述步骤 d ) 中, 所述开 口(230)的宽度为最后形成的鳍状结构的宽度, 其范围是 10-50nm。
9. 根据权利要求 1 所述的方法, 其中, 在所述步骤 e ) 中, 所述半 导体材料为掺杂或非掺杂的单晶硅。
10. 根据权利要求 1所述的方法, 其中, 在所述步骤 e ) 中, 填充半 导体材料的方法为外延生长。
11. 根据权利要求 1所述的方法, 其中, 在所述步骤 e) 中, 填充半 导体材料的方法包括沉积非晶硅并退火形成单晶硅。
12. 根据权利要求 1、 10或 11所述的方法, 其中, 在所述步骤 e)
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