We report on medium area (1 cm2) slot-die coated organic photovoltaic devices (OPVs) of a recently
developed semi-random copolymer of poly-3-hexylthiophene and diketopyrrolopyrrole (P3HTT–DPP-
10%) mixed with phenyl-C61-butyric acid methyl ester (PCBM). The devices were prepared using a
compact laboratory roll-coater using only slot-die coating and flexographic printing under ambient
conditions on a flexible ITO-free substrate. In order to overcome a low JSC and FF obtained for single
junction devices, devices were also prepared in a tandem geometry making it possible to employ thinner
junction films. Power conversion efficiencies of up to 1.36% and 1.31% were achieved for the tandem and
single junction geometries, respectively.