MeV自辐照诱导锗中前所未有的严重原子重分布
Unprecedented Severe Atomic Redistribution in Germanium Induced by MeV Self-Irradiation
AI总结：
研究发现2.5 MeV Ge离子自辐照使晶态Ge层形成剂量依赖的波纹表面，并证明其驱动力来自材料内部原子重分布而非侵蚀或体积膨胀。
摘要：
我们展示了在2.5 MeV高能Ge离子束重离子辐照下，晶态Ge层发生的显著且前所未有的表面改性。在该辐照条件下，Ge层并未像在其他入射离子和较低能量下观察到的那样变得多孔，而是形成不均匀的波纹形貌，其粗糙度随辐照剂量单调增加。我们表明，该现象既非由表面侵蚀效应引起，也非由非均匀体积膨胀引起。相反，材料内部的原子重分布是形成波纹表面的唯一驱动力。此外，射程末端区域附近非常平坦的界面表明，Ge层的变形很可能在辐照后达到最大程度。文中基于辐照诱导塑性流动，并结合离子-固体相互作用中电子成分的较大贡献，讨论了所观察到的形貌改性。
英文摘要：
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.
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