论文标题
MEV自我辐射引起的锗中史无前例的严重原子重新分布
Unprecedented Severe Atomic Redistribution in Germanium Induced by MeV Self-Irradiation
论文作者
论文摘要
我们提出了在重离子辐照下，在高能量为2.5 meV的重离子辐射下晶体GE层的明显前所未有的表面修饰。在辐照条件下，GE层并未成为其他弹丸和较低能量的多孔，而是发展成不均匀的纹波形态，其中粗糙度随照射剂量单调增加。我们表明，这种现象既不是由于表面侵蚀效应而引起的，也不是由体积膨胀的不均匀引起的。相反，大部分材料中的原子重新分布是纹波表面的唯一动力。此外，辐照后，GE层的变形可能发生到最大延伸，如距离端末端区域周围非常平坦的界面所示。根据辐照诱导的塑性流，讨论了观察到的形态修饰，并与离子 - 固体相互作用中电子成分的更大贡献相结合。
We present a pronounced unprecedented surface modification of a crystalline Ge layer under heavy ion irradiation with a Ge ion beam at high energy of 2.5 MeV. Under the irradiation conditions, the Ge layer did not become porous as observed for other projectiles and lower energies but develops into an uneven ripple morphology in which the roughness monotonically increases with the irradiation doses. We show that this phenomenon is caused neither by surface erosion effect nor by a non-uniform volumetric expansion. Rather, atomic redistribution in the bulk of the material is the only drive for the ripple surface. Furthermore, the deformation of the Ge layer likely occurs to largest extend after irradiation, as indicated by the very flat interface around the end-of-range region. The observed morphology modification is discussed based on irradiation-induced plastic flow, coupled with a larger contribution of the electronic component in the ion-solid interactions.
