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    • 1. 发明授权
    • Recovery of electronic properties in process-damaged ferroelectrics by voltage-cycling
    • 通过电压循环恢复工艺损坏的铁电体中的电子特性
    • US06171934B2
    • 2001-01-09
    • US09144297
    • 1998-08-31
    • Vikram JoshiNarayan SolayappanWalter HartnerG{umlaut over (u)}nther Schindler
    • Vikram JoshiNarayan SolayappanWalter HartnerG{umlaut over (u)}nther Schindler
    • H01L21326
    • H01L27/11502H01L27/11507H01L28/55
    • An integrated circuit is formed containing a metal-oxide ferroelectric thin film. An voltage-cycling recovery process is conducted to reverse the degradation of ferroelectric properties caused by hydrogen. The voltage-cycling recovery process is conducted by applying from 104 to 1011 voltage cycles with a voltage amplitude of from 1 to 15 volts. Conducting voltage-cycling at a higher temperature in the range 30-200° C. enhances recovery. Preferably the metal oxide thin film comprises layered superlattice material. Preferably the layered superlattice material comprises strontium bismuth tantalate or strontium bismuth tantalum niobate. If the integrated circuit manufacture includes a forming-gas anneal, then the voltage-cycling recovery process is performed after the forming-gas anneal. The voltage-cycling recovery process obviates oxygen-recovery annealing, and it allows continued use of conventional hydrogen-rich plasma processes and forming-gas anneals without the risk of permanent damage to the ferroelectric thin film.
    • 形成含有金属氧化物铁电体薄膜的集成电路。 进行电压循环恢复处理以逆转由氢引起的铁电性能的降低。 通过施加电压幅度为1至15伏特的104至1011个电压周期来执行电压循环恢复过程。 在30-200℃范围内的较高温度下进行电压循环,提高了回收率。 优选地,金属氧化物薄膜包括层状超晶格材料。 优选地,层状超晶格材料包括钽酸铋钽铋或铌酸铋钽酸铋。 如果集成电路制造包括成形气体退火,则在成形气体退火之后执行电压循环恢复过程。 电压循环恢复过程避免氧回收退火,并且其允许继续使用常规富氢等离子体工艺和形成气体退火,而不会对铁电薄膜造成永久损坏的风险。
    • 3. 发明授权
    • Recovery of electronic properties in hydrogen-damaged ferroelectrics by low-temperature annealing in an inert gas
    • 在惰性气体中通过低温退火在氢损坏的铁电体中回收电子性能
    • US06322849B2
    • 2001-11-27
    • US09191634
    • 1998-11-13
    • Vikram JoshiNarayan SolayappanWalter HartnerGünther Schindler
    • Vikram JoshiNarayan SolayappanWalter HartnerGünther Schindler
    • B05D512
    • H01L27/11502H01L27/11507H01L28/55
    • An integrated circuit is formed containing a metal-oxide ferroelectric thin film. An inert-gas recovery anneal is conducted to reverse the degradation of ferroelectric properties caused by hydrogen. The inert-gas recovery anneal is conducted in an unreactive gas atmosphere at a temperature range from 300° to 1000° C. for a time period from one minute to two hours. Preferably, the metal-oxide thin film comprises layered superlattice material. Preferably, the layered superlattice material comprises strontium bismuth tantalate or strontium bismuth tantalum niobate. If the integrated circuit manufacture includes a forming-gas anneal, then the inert-gas recovery anneal is performed after the forming-gas anneal, preferably at or near the same temperature and for the same time duration as the forming-gas anneal. The inert-gas recovery anneal obviates oxygen-recovery annealing, and it allows continued use of conventional hydrogen-rich plasma processes and forming-gas anneals without the risk of permanent damage to the ferroelectric thin film. The unreactive gas atmosphere can contain a pure unreactive gas or a mixture of unreactive gases. The unreactive gas can be any relatively unreactive gas, such as nitrogen or argon.
    • 形成含有金属氧化物铁电体薄膜的集成电路。 进行惰性气体回收退火以逆转由氢引起的铁电性能的降低。 惰性气体回收退火在300〜1000℃的无反应气体气氛中进行1分钟〜2小时。 优选地,金属氧化物薄膜包括层状超晶格材料。 优选地,层状超晶格材料包括铋铋钽酸锶或铌酸铋钽酸铋。 如果集成电路制造包括成形气体退火,则惰性气体回收退火在成形气体退火之后进行,优选在与成形气体退火相同或接近相同的温度和相同的持续时间。 惰性气体回收退火避免了氧回收退火,并且允许继续使用常规富氢等离子体工艺和形成气体退火,而不会对铁电薄膜造成永久性损坏的风险。 非活性气体气氛可以含有纯的非反应性气体或非反应性气体的混合物。 非反应性气体可以是任何相对不反应的气体,例如氮气或氩气。
    • 10. 发明授权
    • Deglaze route to compensate for film non-uniformities after STI oxide processing
    • DeGaaze路径补偿STI氧化物处理后的膜不均匀性
    • US07351642B2
    • 2008-04-01
    • US11036536
    • 2005-01-14
    • Walter HartnerJoseph PageJonathan Davis
    • Walter HartnerJoseph PageJonathan Davis
    • H01L21/76
    • H01L21/31055
    • A process and method for compensating for a radial non-uniformity on a wafer that includes the steps of: centering a rotational thickness non-uniformity of a film on the wafer about the axis of the spin susceptor following a CMP process; positioning a nozzle in the spin processing unit to direct the etching solution along a radius of the wafer; adjusting the flow of the etching solution from the nozzle; adjusting the rotational speed of the spin susceptor to control the residence time of the etching solution; and coordinating the rotational speed of the spin susceptor, flow of etching solution and positioning of the nozzle to maximize the removal of material. The process may be utilized to compensate for the bowl-shaped non-uniformities of an STI oxide. These non-uniformities are compensated for and addressed after a CMP process.
    • 一种用于补偿晶片上的径向不均匀性的方法和方法,包括以下步骤:在CMP工艺之后使膜周围的旋转基座的轴线上的膜的旋转厚度不均匀性居中; 将喷嘴定位在旋转处理单元中以沿着晶片的半径引导蚀刻溶液; 从喷嘴调节蚀刻溶液的流动; 调整旋转基座的旋转速度以控制蚀刻溶液的停留时间; 并协调旋转基座的旋转速度,蚀刻溶液的流动和喷嘴的定位,以最大限度地去除材料。 该方法可用于补偿STI氧化物的碗形不均匀性。 这些非均匀性在CMP过程之后得到补偿和解决。