Dataset for: "Superacid-derived surface passivation for measurement of ultra-long lifetimes in silicon photovoltaic materials" by A.I. Pointon, N.E. Grant, E.C. Wheeler-Jones, P.P. Altermatt, J.D. Murphy Accepted for publication in Solar Energy Materials and Solar Cells on 14th March 2018. DOI: 10.1016/j.solmat.2018.03.028 The dataset (a single file in XLSX format) contains the data behind all the graphs presented in the paper. Each worksheet within the file relates to a single figure in the paper. Captions to the figures are given in the paper. Abbreviations, variables and methods used are defined in the paper. Please address any queries to john.d.murphy@warwick.ac.uk or nicholas.e.grant@warwick.ac.uk.