Thermal evolution of the indentation-induced phases of silicon

S. Wong, B. C. Johnson, B. Haberl, A. Mujica, J. C. McCallum, J. S. Williams, J. E. Bradby

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    Novel phases of Si that are predicted to have industrially desirable properties can be recovered after indentation-induced pressure. However, the thermal stability of these phases is not well understood. Furthermore, in the past, different methods of annealing have resulted in conflicting reports on annealing stability and transformation pathways. This study investigates the thermal stability of several metastable Si phases called r8-Si, bc8-Si, hd-Si, and Si-XIII under furnace annealing, incremental annealing, and laser annealing using Raman microspectroscopy and electron diffraction. The temperature range of stability for these metastable phases is thus determined. Of particular interest, hd-Si is stable to a much higher temperature than previously reported, being the predominant phase observed in this study after annealing at 450 °C. This finding was enabled through a new method for confirming the presence of hd-Si by detailed electron diffraction. This high thermal stability generates renewed interest in exploiting this phase for industrial applications, such as strain-tailored solar absorption.

    Original languageEnglish
    Article number105901
    JournalJournal of Applied Physics
    Volume126
    Issue number10
    DOIs
    Publication statusPublished - 14 Sept 2019

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