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    • 4. 发明授权
    • Cleaning contact with successive fluorine and hydrogen plasmas
    • 与连续的氟和氢等离子体清洁接触
    • US06313042B1
    • 2001-11-06
    • US09390135
    • 1999-09-03
    • Barney M. CohenJingang SuKenny King-Tai NganJr-Jyan Chen
    • Barney M. CohenJingang SuKenny King-Tai NganJr-Jyan Chen
    • H01L21302
    • H01L21/02063H01L21/76814H01L21/76843H01L21/76844Y10S438/906
    • A method of cleaning a contact area of a semiconductor or metal region on a substrate of an electronic device. First, the contact area is cleaned by exposing the substrate to a plasma that includes fluorine-containing species. Second, the substrate is exposed to a second atmosphere that scavenges fluorine, preferably formed by plasma decomposition of a hydrogen-containing gas. The second atmosphere removes any fluorine residue remaining on the contact area and overcomes any need to include argon sputtering in the cleaning process. Another aspect of the invention is a method of depositing a refractory metal over a contact area of a semiconductor region on a substrate. The contact area is cleaned according to the two-step process of the preceding paragraph. Then a refractory metal is deposited over the contact area. The two-step cleaning process can reduce the electrical resistance between the refractory metal and the semiconductor region. Furthermore, if the substrate is annealed to interdiffuse atoms of the semiconductor material and the refractory metal, the two-step cleaning process can reduce the anneal temperature required to achieve a desired low electrical resistance.
    • 一种清洁电子设备的基板上的半导体或金属区域的接触区域的方法。 首先,通过将衬底暴露于包含含氟物质的等离子体来清洁接触区域。 其次,将基板暴露于清除氟的第二气氛,优选通过含氢气体的等离子体分解形成。 第二个气氛除去残留在接触区域上的任何氟残余物,并且克服了在清洗过程中包括氩气溅射的任何需要。 本发明的另一方面是在基板上的半导体区域的接触区域上沉积难熔金属的方法。 接触面积按前款两步法清洗。 然后在接触区域上沉积难熔金属。 两步清洁工艺可​​以降低难熔金属和半导体区域之间的电阻。 此外,如果衬底对半导体材料和难熔金属的相互扩散原子退火,则两步清洁工艺可​​以降低实现期望的低电阻所需的退火温度。