摘要:
A method of fabricating a c-axis ferroelectric thin film includes preparing a substrate; depositing a layer of ferroelectric material by metal organic chemical vapor deposition, including using a precursor solution having a ferroelectric material concentration of about 0.1 M/L at a vaporizer temperature of between about 140° C. to 200° C.; and annealing the substrate and the ferroelectric material at a temperature between about 500° C. to 560° C. for between about 30 minutes to 120 minutes.
摘要:
An electrode for use in a ferroelectric device includes a bottom electrode; a ferroelectric layer; and a top electrode formed on the ferroelectric layer and formed of a combination of metals, including a first metal take from the group of metals consisting of platinum and iridium, and a second metal taken from the group of metals consisting of aluminum and titanium; wherein the top electrode acts as a passivation layer and wherein the top electrode remains conductive following high temperature annealing in a hydrogen atmosphere. A method of forming a hydrogen-resistant electrode in a ferroelectric device includes forming a bottom electrode; forming a ferroelectric layer on the bottom electrode; depositing a top electrode on the ferroelectric layer; including depositing, simultaneously, a first metal taken from the group of metals consisting of platinum and iridium; and a second metal taken from the group of metals consisting of aluminum and titanium; and forming a passivation layer by annealing the structure in an oxygen atmosphere to form an oxide passivation layer on the top electrode.
摘要:
A ferroelectric Pb5Ge3O11 (PGO) thin film is provided with a metal organic vapor deposition (MOCVD) process and RTP (Rapid Thermal Process) annealing techniques. The PGO film is substantially crystallization with c-axis orientation at temperature between 450 and 650° C. The PGO film has an average grain size of about 0.5 microns, with a deviation in grain size uniformity of less than 10%. Good ferroelectric properties are obtained for a 150 nm thick film with Ir electrodes. The films also show fatigue-free characteristics: no fatigue was observed up to 1×109 switching cycles. The leakage currents increase with increasing applied voltage, and are about 3.6×10−7A/cm2 at 100 kV/cm. The dielectric constant shows a behavior similar to most ferroelectric materials, with a maximum dielectric constant of about 45. These high quality MOCVD Pb5Ge3O11 films can be used for high density single transistor ferroelectric memory applications because of the homogeneity of the PGO film grain size.
摘要翻译:铁电Pb5Ge3O11(PGO)薄膜提供金属有机气相沉积(MOCVD)工艺和RTP(快速热处理)退火技术。 PGO膜在450-650℃的温度下基本上以c轴取向结晶.PGO膜的平均粒径为约0.5微米,晶粒尺寸均匀度的偏差小于10%。 对于具有Ir电极的150nm厚的膜,获得良好的铁电性能。 这些胶片还显示出无疲劳特性:在1x109个开关周期内没有观察到疲劳。 泄漏电流随着施加电压的增加而增加,在100kV / cm时为约3.6×10 -7 A / cm 2。 介电常数表现出类似于大多数铁电材料的行为,其最大介电常数为约45.这些高质量的MOCVD Pb5Ge3O11膜可用于高密度单晶硅铁氧体存储器应用,因为PGO膜晶粒尺寸的均匀性。
摘要:
A method of fabricating a ferroelectric memory transistor using a lithographic process having an alignment tolerance of .delta., includes preparing a silicon substrate for construction of a ferroelectric gate unit; implanting boron ions to form a p- well in the substrate; isolating plural device areas on the substrate; forming a FE gate stack surround structure; etching the FE gate stack surround structure to form an opening having a width of L1 to expose the substrate in a gate region; depositing oxide to a thickness of between about 10 nm to 40 nm over the exposed substrate; forming a FE gate stack over the gate region, wherein the FE gate stack has a width of L2, wherein L2.gtoreq.L1+2.delta.; depositing a first insulating layer over the structure; implanting arsenic or phosphorous ions to form a source region and a drain region; annealing the structure; depositing a second insulating layer; and metallizing the structure. A ferroelectric memory transistor includes a silicon substrate having a p- well formed therein; a gate region, a source region and a drain region disposed along the upper surface of said substrate; a FE gate stack surround structure having an opening having a width of L1 located about said gate region; a FE gate stack formed in said FE gate stack surround structure, wherein said FE gate stack has a width of L2, wherein L2.gtoreq.L1+2.delta., wherein .delta. is the alignment tolerance of the lithographic process.
摘要:
A method of buffer layer formation for RRAM thin film deposition includes preparing a substrate; depositing a bottom electrode on the substrate; depositing a thin layer of a transition metal having a multiple valence on the bottom electrode; depositing a layer of metal oxide on the transition metal; depositing a top electrode on the metal oxide; annealing the substrate and the layers formed thereon; and completing the RRAM.
摘要:
PrCaMnO (PCMO) thin films with predetermined memory-resistance characteristics and associated formation processes have been provided. In one aspect the method comprises: forming a Pr3+1−xCa2+xMnO thin film composition, where 0.1
摘要翻译:已经提供了具有预定的记忆电阻特性和相关的形成过程的PrCaMnO(PCMO)薄膜。 在一个方面,所述方法包括:形成Pr 3+ 1-x 2 Ca 2 O 3 x MnO薄膜 组成,其中0.1 0.78Mn4+</SUP>0.22O2-2.96 SUB>组合, Mn和O离子的比例变化如下:O 2 - (2.96); Mn(3+)+((1-x)+ 8%); 和Mn 4+(x-8%)。 在另一方面,该方法响应于晶体取向在PCMO膜中产生密度。 例如,如果PCMO膜具有(110)取向,则在垂直于(110)取向的平面中产生在每平方英尺5至6.76个Mn原子的范围内的密度。
摘要:
A method is provided for forming a metal/semiconductor/metal (MSM) current limiter and resistance memory cell with an MSM current limiter. The method comprises: providing a substrate; forming an MSM bottom electrode overlying the substrate; forming a ZnOx semiconductor layer overlying the MSM bottom electrode, where x is in the range between about 1 and about 2, inclusive; and, forming an MSM top electrode overlying the semiconductor layer. The ZnOx semiconductor can be formed through a number of different processes such as spin-coating, direct current (DC) sputtering, radio frequency (RF) sputtering, metalorganic chemical vapor deposition (MOCVD), or atomic layer deposition (ALD).
摘要:
PrCaMnO (PCMO) thin films with predetermined memory-resistance characteristics and associated formation processes have been provided. In one aspect the method comprises: forming a Pr3+1−xCa2+xMnO thin film composition, where 0.1
摘要翻译:已经提供了具有预定的记忆电阻特性和相关的形成过程的PrCaMnO(PCMO)薄膜。 在一个方面,所述方法包括:形成Pr 3+ 1-x 2 Ca 2 O 3 x MnO薄膜 组成,其中0.1 0.78Mn4+</SUP>0.22O2-2.96 SUB>组合, Mn和O离子的比例变化如下:O 2 - (2.96); Mn(3+)+((1-x)+ 8%); 和Mn 4+(x-8%)。 在另一方面,该方法响应于晶体取向在PCMO膜中产生密度。 例如,如果PCMO膜具有(110)取向,则在垂直于(110)取向的平面中产生在每平方英尺5至6.76个Mn原子的范围内的密度。
摘要:
The present invention discloses a method to achieve grading PCMO thin film for use in RRAM memory devices since the contents of Ca, Mn and Pr in a PCMO film can have great influence on its switching property. By choosing precursors for Pr, Ca and Mn having different deposition rate behaviors with respect to deposition temperature or vaporizer temperature, PCMO thin film of grading Pr, Ca or Mn distribution can be achieved by varying that process condition during deposition. The present invention can also be broadly applied to the fabrication of any multicomponent grading thin film process by varying any of the deposition parameters after preparing multiple precursors to have different deposition rate behaviors with respect to that particular process parameter. The present invention starts with a proper selection of precursors in which the selected precursors have different deposition rates with respect to at least one deposition condition such as deposition temperature or vaporizer temperature. The precursors can then be arranged in different delivery systems, or can be pre-mixed in a proper ratio for use in a delivery system, or in any other combinations such as a mixture of two or three liquid precursors using a direct liquid injection and a separate gaseous precursor delivery system for gaseous process gas. Then by varying the appropriate deposition condition, a grading thin film can be achieved.
摘要:
A method of fabricating a CMR thin film for use in a semiconductor device includes preparing a CMR precursor in the form of a metal acetate based acetic acid solution; preparing a wafer; placing a wafer in a spin-coating chamber; spin-coating and heating the wafer according to the following: injecting the CMR precursor into a spin-coating chamber and onto the surface of the wafer in the spin-coating chamber; accelerating the wafer to a spin speed of between about 1500 RPM to 3000 RPM for about 30 seconds; baking the wafer at a temperature of about 180° C. for about one minute; ramping the temperature to about 230° C.; baking the wafer for about one minute at the ramped temperature; annealing the wafer at about 500° C. for about five minutes; repeating said spin-coating and heating steps at least three times; post-annealing the wafer at between about 500° C. to 600° C. for between about one to six hours in dry, clean air; and completing the semiconductor device.