The last issue of the Revista Española de Física (RdF) of the RSEF contains five articles written by the winners of the XII edition of the Research Awards "For Women in Science" from L'Oréal-UNESCO. The Editorial Committee decided to invite them to write an article about their research for the section "Temas de Física". Mariona Coll, from the ICMAB, has written the article "Oxides and low-cost chemical methods: New perspectives for photovoltaics".