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Influence of irregular growth of monoatomic steps during Si/Si(001)epitaxy on generation of surface defects

机译:Si / Si(001)外延过程中单原子台阶不规则生长对表面缺陷产生的影响

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We present results of STM investigation of surface of the Si epitaxial layers deposited on different Si(001)vicinal substrates at the step flow growth mode. We have observed two types of the growth defects looking like meandering or pits. The way of the defects formation does not depend on the direction of tilt of the Si(OOl)substrate. The formation of the defects is connected with particularities of the processes of the movement onto terraces and attachment to the step edge of Si ad-atoms during growth. We suppose that Ehrlich-Schwoebel and kink Ehrlich-Schwoebel effects drive irregular growth of the monoatomic steps during Si/Si(001)epitaxy. Process of the defect formation starts when the deep kink confined by two S_a steps appears on the step edge. Next difference between growth rate of the S_a and S_b steps results in formation of the area with other morphology.
机译:我们目前的STM调查结果的步骤外延生长模式下沉积在不同的Si(001)毗连衬底上的Si外延层表面。我们观察到了两种类型的生长缺陷,看起来像曲折或凹坑。缺陷形成的方式不取决于Si(001)衬底的倾斜方向。缺陷的形成与生长到平台上的运动过程的特殊性以及在生长过程中附着到硅原子的台阶边缘有关。我们假设Ehrlich-Schwoebel和扭结Ehrlich-Schwoebel效应在Si / Si(001)外延过程中驱动单原子台阶的不规则生长。当由两个S_a台阶约束的深扭结出现在台阶边缘时,开始形成缺陷。 S_a和S_b步骤的生长速率之间的下一个差异导致形成具有其他形态的区域。

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