Wafer-Scale Synthesis and Optical Characterization of InP Nanowire Arrays for Solar Cells

Lukas Hrachowina, Nicklas Anttu, Magnus T. Borgström

Research output: Contribution to journalArticlepeer-review


Nanowire solar cells have the potential to reach the same efficiencies as the world-record III-V solar cells while using a fraction of the material. For solar energy harvesting, large-area nanowire solar cells have to be processed. In this work, we demonstrate the synthesis of epitaxial InP nanowire arrays on a 2 inch wafer. We define five array areas with different nanowire diameters on the same wafer. We use a photoluminescence mapper to characterize the sample optically and compare it to a homogeneously exposed reference wafer. Both steady-state and time-resolved photoluminescence maps are used to study the material's quality. From a mapping of reflectance spectra, we simultaneously extract the diameter and length of the nanowires over the full wafer. The extracted knowledge of large-scale nanowire synthesis will be crucial for the upscaling of nanowire-based solar cells, and the demonstrated wafer-scale characterization methods will be central for quality control during manufacturing.

Original languageEnglish
Pages (from-to)7347-7353
Number of pages7
JournalNano Letters
Issue number17
Publication statusPublished - 2021 Sept 8

Subject classification (UKÄ)

  • Condensed Matter Physics

Free keywords

  • EBIC
  • InP nanowires
  • PL
  • reflectance
  • TRPL


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