During the 2018 edition of the "Incontri di Fisica ad Alte Energie" conference, Davide Basilico, PhD student of the University of Milan and INFN Milano has been awarded for the best talk of the Cosmology and Astroparticle section, which was titled "Recent results of the Borexino experiment: pp chain solar neutrino spectroscopy". The talk summarized the results obtained by the Borexino Collaboration in its second data-taking phase, from 2012 to 2017. The Borexino detector, located at Gran Sasso National Laboratory, measured the low energy solar neutrino fluxes with the best precision ever obtained so far. One of the implications of this spectroscopy is related to the solar metallicity, that is the abundance of elements heavier than Helium in the Sun.