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Here, we report on the fabrication and characterization of radiation sensors based on GaN core\/shell p\u2013n junction microwires working without externally applied bias. With their small size, high resistance to radiation, and high crystalline quality, GaN microwires constitute highly interesting building blocks for radiation-hard devices. Through microfabrication steps, single-wire devices were processed that show a leakage current as low as 1\u2009pA in reverse bias. Irradiation with both UV light and 2\u2009MeV protons results in photo\/ionocurrent signals several orders of magnitude above the dark current and response times below 30\u2009ms. The sensor also showed a good resistance to radiation. Although we observed a small increase in the leakage current after a prolonged proton irradiation, the measured transient ionocurrent signal remains stable during irradiation with a total proton fluence of at least 1\u00d71016 protons\/cm2.<\/jats:p>","DOI":"10.1063\/5.0045050","type":"journal-article","created":{"date-parts":[[2021,5,10]],"date-time":"2021-05-10T11:24:53Z","timestamp":1620645893000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":4,"title":["Self-powered proton detectors based on GaN core\u2013shell p\u2013n microwires"],"prefix":"10.1063","volume":"118","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7693-063X","authenticated-orcid":false,"given":"D.","family":"Verheij","sequence":"first","affiliation":[{"name":"Instituto de Engenharia de Sistemas e Computadores-Microsistemas e Nanotecnologia (INESC-MN) 1 , Rua Alves Redol 9, 1000-029 Lisboa, Portugal"},{"name":"IPFN, Instituto Superior T\u00e9cnico (IST) 2 , Campus Tecnol\u00f3gico e Nuclear, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6774-8492","authenticated-orcid":false,"given":"M.","family":"Peres","sequence":"additional","affiliation":[{"name":"IPFN, Instituto Superior T\u00e9cnico (IST) 2 , Campus Tecnol\u00f3gico e Nuclear, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6913-6529","authenticated-orcid":false,"given":"S.","family":"Cardoso","sequence":"additional","affiliation":[{"name":"Instituto de Engenharia de Sistemas e Computadores-Microsistemas e Nanotecnologia (INESC-MN) 1 , Rua Alves Redol 9, 1000-029 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5369-5019","authenticated-orcid":false,"given":"L. 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