Resistance and lifetime measurements of polymer solar cells using glycerol doped poly[3,4-ethylenedioxythiophene]: poly[styrenesulfonate] hole injection layersEmma Lewis, Bhaskar Mantha and Richard P. BarberEPJ Photovolt., 5 (2014) 50402DOI: https://doi.org/10.1051/epjpv/2014008