Publications by authors named "Giuliano Vescovi"

We present the characterization of a pn-junction GaAs nanowire. For the characterization, current-voltage, electron-beam-induced current, cathodoluminescence, and electron holography measurements are used. We show that by combining information from these four methods, in combination with drift-diffusion modelling, we obtain a detailed picture of how the nanowire pn-junction is configured and how the recombination lifetime varies axially in the nanowire.

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Article Synopsis
  • Space power systems need lightweight and efficient solar panels to operate in harsh space conditions for long durations.
  • Current high-efficiency solar cells face limitations due to the need for heavy radiation shielding, which reduces their power-to-weight ratio.
  • III-V nanowire-array solar cells show significantly better radiation performance than traditional planar designs, potentially allowing for lighter solar cells with improved longevity and efficiency in space.
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X-ray nanobeams are unique nondestructive probes that allow direct measurements of the nanoscale strain distribution and composition inside the micrometer thick layered structures that are found in most electronic device architectures. However, the method is usually extremely time-consuming, and as a result, data sets are often constrained to a few or even single objects. Here we demonstrate that by special design of a nanofocused X-ray beam diffraction experiment we can (in a single 2D scan with no sample rotation) measure the individual strain and composition profiles of many structures in an array of upright standing nanowires.

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