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Photocurrents of three different photodiodes as a function of reverse bias voltage at . For comparison, the photocurrent of a commercially available avalanche photodiode is shown.
A bright field TEM photograph of a heterojunction and selected-area diffraction patterns from different positions indicated by circles.
High-resolution TEM photographs for a heterojunction.
Ge, Si, and O atom distributions in the lines shown by A-B (b) and C-D (c) shown in the TEM photograph (a).
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