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    • 31. 发明申请
    • PLASMA DOPING WITH ENHANCED CHARGE NEUTRALIZATION
    • 具有增强电荷中和的等离子体掺杂
    • US20090004836A1
    • 2009-01-01
    • US11771190
    • 2007-06-29
    • Vikram SinghTimothy MillerBernard Lindsay
    • Vikram SinghTimothy MillerBernard Lindsay
    • H01L21/26C23C16/00H05H1/24
    • C23C14/345H01J37/321H01J37/32165H01J37/32412H01L21/32136
    • A plasma doping apparatus includes a pulsed power supply that generates a pulsed waveform having a first period with a first power level and a second period with a second power level. A plasma source generates a pulsed plasma with the first power level during the first period and with the second power level during the second period. A bias voltage power supply generates a bias voltage waveform at an output that is electrically connected to a platen which supports a substrate. The bias voltage waveform having a first voltage during a first period and second voltage with a negative potential that attract ions in the plasma to the substrate for plasma doping during a second period. At least one of the first and second power levels of the RF waveform is chosen to at least partially neutralize charge accumulating on the substrate.
    • 等离子体掺杂装置包括脉冲电源,其生成具有第一功率电平的第一周期和具有第二功率电平的第二周期的脉冲波形。 等离子体源在第一周期期间产生具有第一功率电平的脉冲等离子体,并且在第二周期期间产生第二功率电平。 偏置电压电源在与支撑衬底的压板电连接的输出端产生偏置电压波形。 偏置电压波形在第一时段期间具有第一电压,在第二周期期间具有将等离子体中的离子吸引到衬底以进行等离子体掺杂的具有负电位的第二电压。 选择RF波形的第一和第二功率电平中的至少一个以至少部分地中和在衬底上累积的电荷。