公开(公告)号：US5378651A

公开(公告)日：1995-01-03

申请号：US56697

申请日：1993-04-30

申请人： Paul D. Agnello ,  Detlev A. Gruetzmacher ,  Tung-Sheng Kuan ,  Thomas O. Sedgwick

发明人： Paul D. Agnello ,  Detlev A. Gruetzmacher ,  Tung-Sheng Kuan ,  Thomas O. Sedgwick

IPC分类号： C30B25/02 ,  H01L21/205 ,  H01L21/203

CPC分类号： C30B29/06 ,  C30B25/02 ,  H01L21/02381 ,  H01L21/02532 ,  H01L21/02576 ,  H01L21/0262 ,  H01L21/02636

摘要： A system and method for growing low defect density epitaxial layers of Si on imperfectly cleaned Si surfaces by either selective or blanket deposition at low temperatures using the APCVD process wherein a first thin, e.g., 10 nm, layer of Si is grown on the surface from silane or disilane, followed by the growing of the remainder of the film from dichlorosilane (DCS) at the same low temperature, e.g., 550.degree. C. to 850.degree. C. The subsequent growth of the second layer with DCS over the first layer, especially if carried out immediately in the very same deposition system, will not introduce additional defects and may be coupled with high and controlled n-type doping which is not available in a silane-based system. Further, in order to achieve an optimal trade-off between the need for an inert ambience to promote silane reaction at low temperature and the need for a hydrogen ambience to prevent surface oxidation from inadvertant residual impurities, depositions are carried out in an ambience composed primarily of He but always containing some H.sub.2. Also, the relative deposition rates on a patterned surface of polycrystalline Si on insulator areas and single crystal Si on single crystal seed areas, when using the reactant silane, are dependent on the temperature of deposition and the relative concentrations of hydrogen and inert gas, e.g., helium, in the ambient gas, and can be controlled by regulating these parameters.

摘要翻译： 通过使用APCVD工艺在低温下通过选择性或覆盖沉积在不完全清洁的Si表面上生长Si的低缺陷密度外延层的系统和方法，其中在表面上生长第一薄例如10nm的Si层， 硅烷或乙硅烷，然后在相同的低温（例如550℃至850℃）下从二氯硅烷（DCS）中生长剩余的膜。随后在第一层上用DCS生长第二层， 特别是如果在相同的沉积系统中立即进行，则不会引入额外的缺陷，并且可能与在硅烷系统中不可用的高且受控的n型掺杂相结合。 此外，为了在惰性气氛促进低温下的硅烷反应的需要和氢气氛的需要之间实现最佳的权衡，以防止表面氧化从不经意的残留杂质，沉积在主要组成的环境中进行 他总是含有一些H2。 此外，当使用反应物硅烷时，在单晶种子区域上的多晶Si绝缘体区域和单晶Si的图案化表面上的相对沉积速率取决于沉积温度和氢气和惰性气体的相对浓度，例如 ，氦气，在环境气体中，并且可以通过调节这些参数来控制。