Continuous roller transfer-printing and automated metrology of >75,000 micro-LED pixels in a single shot

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Abstract

A continuous, single shot roller transfer printing process is presented for the large-scale hybrid integration of semiconductor devices. Transfer of a 320 × 240 pixel micro-LED array, representing >75,000 individual devices in a single shot with sub-micron relative position accuracy is demonstrated. The transfer printing process preserves the array geometry with pixel spatial location error less than 1 µm deviation from the as-designed layout. An automated sub-micron precision metrology system based on simple optical microscopy was developed to asses such large device populations and allow the assessment of yield.
Original languageEnglish
Pages (from-to)2236-2250
Number of pages15
JournalOptical Materials Express
Volume13
Issue number8
DOIs
Publication statusPublished - 13 Jul 2023

Keywords

  • transfer printing
  • semiconductor devices
  • submicron precision

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