Apparatus and methods for thermally processing undoped and lightly doped substrates without pre-heating
    3.
    发明申请
    Apparatus and methods for thermally processing undoped and lightly doped substrates without pre-heating 有权
    用于在不预热的情况下热处理未掺杂和轻掺杂的衬底的装置和方法

    公开(公告)号:US20070072400A1

    公开(公告)日:2007-03-29

    申请号:US11236270

    申请日:2005-09-26

    申请人: Paul Bakeman

    发明人: Paul Bakeman

    IPC分类号: H01L21/20

    摘要: Apparatus for and methods of thermally processing undoped or lightly doped semiconductor wafers (30) that typically are not very absorptive of an annealing radiation beam (14) are disclosed. The apparatus (10) uses a relatively low power activating radiation beam (240) with a photon energy greater than the bandgap energy of the semiconductor substrate in order to generate free carriers (315) at and near the substrate surface (32). The free carriers so generated enhance the absorption by the substrate surface of the longer wavelength annealing radiation beam. The annealing radiation beam is thus able to rapidly heat the substrate surface and permit subsequent rapid cooling to obtain, for example, a high level of electrical activity (activation) of dopants (310) formed therein. The invention obviates the need to pre-heat the substrate in order to increase absorption of the annealing radiation beam when performing thermal processing.

    摘要翻译: 公开了用于热处理未掺杂或轻掺杂的半导体晶片(30)的装置和方法,其通常不会非常吸收退火的辐射束(14)。 装置(10)使用具有大于半导体衬底的带隙能量的光子能量的相对低功率的激活辐射束(240),以便在衬底表面(32)处和附近产生自由载流子(315)。 如此产生的自由载体增强了较长波长退火辐射束的衬底表面的吸收。 因此,退火辐射束能够快速加热衬底表面并允许随后的快速冷却以获得例如在其中形成的掺杂剂(310)的高水平的电活动(激活)。 本发明消除了在进行热处理时预热衬底以增加退火辐射束的吸收的需要。