The role of slot-die coating in the
future of photovoltaics.

High power conversion efficiency has never been as crucial as today, not only for accomplishing the global environmental targets but also for the survival itself of the PV industry. Concepts such as multijunc- tion and tandem solar cells have been part of the PV technology roadmap for a long time. Two sub-cells of inexpensive solar absorb- ers with different bandgaps are combined. Several challenges are evident in accomplishing this, and strategic decisions regarding pro- cessing seem unclear. An overview of the performance-size evolu- tion shows the multiple advantages of using slot-die coating. A clear path for scalability, potential short cycle times, and easy processing on non-flat substrates make slot-die coating a strategic choice for
moving the field forward.