Galagan, Yulia3; Coenen, Erica W. C.4; Zimmermann, Birger5; Slooff, Lenneke H.6; Verhees, Wiljan J. H.6; Veenstra, Sjoerd C.6; Kroon, Jan M.6; Jørgensen, Mikkel1; Krebs, Frederik C1; Andriessen, Ronn3
1 Department of Energy Conversion and Storage, Technical University of Denmark2 Functional organic materials, Department of Energy Conversion and Storage, Technical University of Denmark3 Holst Center4 TNO Science and Industry5 Fraunhofer Gesellschaft6 Energy Research Centre of the Netherlands
Indium-tin-oxide-free (ITO-free) polymer solar cells with composite electrodes containing current-collecting grids and a semitransparent poly(3,4-ethylenedioxythiophene):polystyrenesulfonate) (PEDOT:PSS) conductor are demonstrated. The up-scaling of the length of the solar cell from 1 to 6 cm and the effect of the grid line resistance are explored for a series of devices. Laser-beam-induced current (LBIC) mapping is used for quality control of the devices. A theoretical modeling study is presented that enables the identification of the most rational cell dimension for the grids with different resistances. The performance of ITO-free organic solar cells with different dimensions and different electrode resistances are evaluated for different light intensities. The current generation and electric potential distribution are found to not be uniformly distributed in large-area devices at simulated 1 Sun illumination. The generated current uniformity increases with decreasing light intensities.