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    • 40. 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。