Tracks and voids in amorphous Ge induced by swift heavy-ion irradiation.
نویسندگان
چکیده
Ion tracks formed in amorphous Ge by swift heavy-ion irradiation have been identified with experiment and modeling to yield unambiguous evidence of tracks in an amorphous semiconductor. Their underdense core and overdense shell result from quenched-in radially outward material flow. Following a solid-to-liquid phase transformation, the volume contraction necessary to accommodate the high-density molten phase produces voids, potentially the precursors to porosity, along the ion direction. Their bow-tie shape, reproduced by simulation, results from radially inward resolidification.
منابع مشابه
Structural modification of swift heavy ion irradiated amorphous germanium layers
Swift heavy ion (SHI) irradiation of conventional glasses results in non-saturable plastic flow as a consequence of the ion hammering effect [1]. SHI irradiation of amorphous Si (a-Si) at non-perpendicular incidence also leads to unsaturated plastic flow, which shows a linear dependence on the ion fluence. The positive direction of flow suggests that a liquid phase with density similar to that ...
متن کاملLow fluence swift heavy ion irradiation of amorphous germanium
Synchrotron based Small Angle X-ray Scattering (SAXS) give evidence of SHI irradiation induced ion-tracks in a-Ge. The scattering spectra of the ion-tracks can be fitted by using a model function of a cylindrical electron density distribution with an internal core shell structure. Core and shell are both of constant electron density but one being overthe other under-dense with respect to the su...
متن کاملStructural modification of swift heavy ion irradiated amorphous Ge layers at low temperatures
Recent room-temperature irradiation experiments exposing amorphous germanium (a-Ge) to 185-MeV heavy ions (SHI) at the ANU accelerator facility (Canberra, Australia) revealed strong volume expansions [1]. A detailed study of this effect using various irradiation parameters [2] demonstrates that this swelling is caused by the formation and growth of randomly distributed voids leading to a gradua...
متن کاملMorphology and elastic properties of swift heavy ion tracks in quartz
Irradiation of a solid with swift heavy ions can induce structural modifications in a very narrow region around the ion trajectories, so called ion tracks. In quartz, swift heavy ion irradiation leads to a change in the refractive index and offers a means to impose an etch anisotropy in the material, paving the way for nano-fabrication and micromachining of optical devices. Ion tracks in quartz...
متن کاملFine structure in swift heavy ion tracks in amorphous SiO2.
We report on the observation of a fine structure in ion tracks in amorphous SiO2 using small angle x-ray scattering measurements. Tracks were generated by high energy ion irradiation with Au and Xe between 27 MeV and 1.43 GeV. In agreement with molecular dynamics simulations, the tracks consist of a core characterized by a significant density deficit compared to unirradiated material, surrounde...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 110 24 شماره
صفحات -
تاریخ انتشار 2013