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However, GaAs compound-based electronics demand a significant decrease in their manufacturing costs to be a good competitor in the commercial markets. In this context, copper-based nanoparticle (NP) inks represent one of the most cost-effective metal inks as a proper candidate to be deposited as contact grids on GaAs. In addition, Inkjet-printing, as a low-cost back-end of the line process, is a flexible manufacturing method to deposit copper NP ink on GaAs. These printed copper NP structures need to be uncapped and fused via a sintering method in order to become conductive and form an ohmic contact with low contact resistivity. The main challenge for uncapping a copper-based NP ink is its rapid oxidation potential. Laser sintering, as a fast uncapping method for NPs, reduces the oxidation of uncapped copper. The critical point to combine these two well-known industrial methods of inkjet printing and laser sintering is to adjust the printing features and laser sintering power in a way that as much copper as possible is uncapped resulting in minimum contact resistivity and high conductivity. In this research, copper ink contact grids were deposited on n-doped GaAs by inkjet-printing. The printed copper ink was converted to a copper grid via applying the optimized settings of a picosecond laser. As a result, an ohmic copper on GaAs contact with a low contact resistivity (8 m\u03a9 cm<jats:sup>2<\/jats:sup>) was realized successfully.<\/jats:p>","DOI":"10.1088\/1361-6528\/abe902","type":"journal-article","created":{"date-parts":[[2021,2,23]],"date-time":"2021-02-23T22:32:32Z","timestamp":1614119552000},"page":"225205","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":15,"title":["Ohmic contact formation for inkjet-printed nanoparticle copper inks on highly doped GaAs"],"prefix":"10.1088","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8558-9181","authenticated-orcid":false,"given":"Nastaran","family":"Hayati-Roodbari","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander","family":"Wheeldon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carina","family":"Hendler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander","family":"Fian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roman","family":"Trattnig","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2021,3,12]]},"reference":[{"key":"nanoabe902bib1","doi-asserted-by":"publisher","author":"Baca","year":"2005","DOI":"10.1049\/PBEP006E"},{"key":"nanoabe902bib2","author":"Horowitz","year":"2018"},{"key":"nanoabe902bib3","author":"Miyoshi","year":"2001"},{"key":"nanoabe902bib4","doi-asserted-by":"publisher","first-page":"8446","DOI":"10.1039\/c0jm00264j","volume":"20","author":"Perelaer","year":"2010","journal-title":"J. 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