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We report the evidence of CdSe quantum dot (QD) insertion in single defect-free ZnSe nanowire. These nanowires have been grown by molecular beam epitaxy in vapour–liquid–solid growth mode catalysed with gold particles. We developed a two-step process allowing us to grow very thin (from 15 to 5nm) defect-free ZnSe nanowire on top of a nanoneedle, where all defects are localised. The CdSe QDs are incorporated...