German company Heliatek GmbH recently announced that its tandem solar cell technology has been verified to be the highest efficiency ever (9.8%) for an organic solar cell. The record-breaking cells were fabricated on glass substrates produced in its laboratory environment, and the breakthrough was achieved by optimizing the absorber layer's material, deposition process, and morphology.
According to Dr. Martin Pfeiffer, Heliatek's CTO and co-founder, "we can routinely reproduce this efficiency level and can get reasonable module efficiency, even though the lab equipment uses point sources for evaporation which leads to significant thickness inhomogeneities. For the production process, we will use linear sources that have been optimized for the OLED industry so that the providers can guarantee excellent homogeneity."...