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An important research goal is to improve the interface between the absorber and the window layer by inserting buffer layers to adjust the transition. Depth\u2010resolved studies are key for a fundamental understanding of the interface. In the present experiment, the interface between the chalcopyrite Cu(In,Ga)Se<jats:sub>2<\/jats:sub> absorber and various buffer layers are investigated using low\u2010energy muon spin rotation (\u03bcSR) spectroscopy. Depth resolution in the nm range is achieved by implanting the muons with different energies so that they stop at different depths in the sample. Near the interface, a region about 50 nm wide is detected where the lattice is more distorted than further inside the absorber. The distortion is attributed to the long\u2010range strain field caused by defects. These measurements allow a quantification of the corresponding passivation effect of the buffer layer. Bath\u2010deposited cadmium sulfide provides the best defect passivation in the near interface region, in contrast to the dry\u2010deposited oxides, which have a much smaller effect. The experiment demonstrates the great potential of low energy \u03bcSR spectroscopy for microscopic interfacial studies of multilayer systems.<\/jats:p>","DOI":"10.1002\/admi.202200374","type":"journal-article","created":{"date-parts":[[2022,6,7]],"date-time":"2022-06-07T22:05:26Z","timestamp":1654639526000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Characterization of the Interfacial Defect Layer in Chalcopyrite Solar Cells by Depth\u2010Resolved Muon Spin Spectroscopy"],"prefix":"10.1002","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0139-1993","authenticated-orcid":false,"given":"Helena V.","family":"Alberto","sequence":"first","affiliation":[{"name":"CFisUC Department of Physics University of Coimbra  R. 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