Understanding the electronic properties of BaTiO3 and Er3+ doped BaTiO3 films through confocal scanning microscopy and XPS: the role of oxygen vacancies - Huaman, Jose Luis Clabel; Awan, Iram Taj; Calderón, Gaston Lozano; Silva, Marcelo de Assumpção Pereira da; Romano, Renan Arnon; Rivera, V. A. G.; Ferreira, S. O.; Marega Junior, Euclydes (Physical Chemistry Chemical Physics, 2020)