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However, they suffer from significant degradation during the initial stages of use. This problem has been studied for 40 years resulting in over 250 research publications. Despite this, there is no consensus regarding the microscopic nature of the defect reactions responsible. In this paper, we present compelling evidence of the mechanism of degradation. We observe, using deep level transient spectroscopy and photoluminescence, under the action of light or injected carriers, the conversion of a deep boron-di-oxygen-related donor state into a shallow acceptor which correlates with the change in the lifetime of minority carriers in the silicon. Using ab initio modeling, we propose structures of the BsO2 defect which match the experimental findings. We put forward the hypothesis that the dominant recombination process associated with the degradation is trap-assisted Auger recombination. This assignment is supported by the observation of above bandgap luminescence due to hot carriers resulting from the Auger process.<\/jats:p>","DOI":"10.1063\/1.5091759","type":"journal-article","created":{"date-parts":[[2019,5,14]],"date-time":"2019-05-14T12:02:20Z","timestamp":1557835340000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":44,"title":["Identification of the mechanism responsible for the boron oxygen light induced degradation in silicon photovoltaic cells"],"prefix":"10.1063","volume":"125","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6770-5780","authenticated-orcid":false,"given":"Michelle","family":"Vaqueiro-Contreras","sequence":"first","affiliation":[{"name":"Photon Science Institute, School of Electrical and Electronic Engineering, The University of Manchester 1 , Manchester M13 9PL,","place":["United Kingdom"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2503-6144","authenticated-orcid":false,"given":"Vladimir P.","family":"Markevich","sequence":"additional","affiliation":[{"name":"Photon Science Institute, School of Electrical and Electronic Engineering, The University of Manchester 1 , Manchester M13 9PL,","place":["United Kingdom"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0280-366X","authenticated-orcid":false,"given":"Jos\u00e9","family":"Coutinho","sequence":"additional","affiliation":[{"name":"Department of Physics and I3N, University of Aveiro 2 , Campus Santiago, 3810-193 Aveiro,","place":["Portugal"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8289-185X","authenticated-orcid":false,"given":"Paulo","family":"Santos","sequence":"additional","affiliation":[{"name":"Department of Physics and I3N, University of Aveiro 2 , Campus Santiago, 3810-193 Aveiro,","place":["Portugal"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8797-3582","authenticated-orcid":false,"given":"Iain F.","family":"Crowe","sequence":"additional","affiliation":[{"name":"Photon Science Institute, School of Electrical and Electronic Engineering, The University of Manchester 1 , Manchester M13 9PL,","place":["United Kingdom"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7441-4247","authenticated-orcid":false,"given":"Matthew P.","family":"Halsall","sequence":"additional","affiliation":[{"name":"Photon Science Institute, School of Electrical and Electronic Engineering, The University of Manchester 1 , Manchester M13 9PL,","place":["United Kingdom"]}]},{"given":"Ian","family":"Hawkins","sequence":"additional","affiliation":[{"name":"Photon Science Institute, School of Electrical and Electronic Engineering, The University of Manchester 1 , Manchester M13 9PL,","place":["United Kingdom"]}]},{"given":"Stanislau B.","family":"Lastovskii","sequence":"additional","affiliation":[{"name":"Scientific-Practical Materials Research Center of the National Academy of Sciences of Belarus 3 , Minsk 220072,","place":["Belarus"]}]},{"given":"Leonid I.","family":"Murin","sequence":"additional","affiliation":[{"name":"Scientific-Practical Materials Research Center of the National Academy of Sciences of Belarus 3 , Minsk 220072,","place":["Belarus"]}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7667-4624","authenticated-orcid":false,"given":"Anthony R.","family":"Peaker","sequence":"additional","affiliation":[{"name":"Photon Science Institute, School of Electrical and Electronic Engineering, The University of Manchester 1 , Manchester M13 9PL,","place":["United Kingdom"]}]}],"member":"317","published-online":{"date-parts":[[2019,5,14]]},"reference":[{"key":"2025100717035736200_c1","doi-asserted-by":"publisher","first-page":"15015","DOI":"10.1038\/nenergy.2015.15","volume":"1","year":"2016","journal-title":"Nat. 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