Olivier Ronsin, HI ERN, IEK-11
Simulation of film morphology formation in printable photovoltaics
The performance of organic solar cells strongly depends on the morphology of the photoactive layer. However, the process-structure relationship remains poorly understood. We propose an original coupled phase field – fluid mechanics theoretical framework gathering the main physical processes that drive the morphology formation of the photoactive layer for solution-processed photovoltaics. The considered phenomena are evaporation, liquid-liquid phase separation and coarsening, crystal nucleation, growth and coarsening in polycrystalline materials. Simulations of the bulk heterojunction formation for the model system P3HT-PCBM are presented, and an excellent agreement between simulation results and numerous available experimental data is demonstrated. Preliminary results in the case of perovskite films are also compared to experimental data obtained at the Solar Factory of the Future. The expected benefit of such an approach is to identify physical design rules for ink formulation and processing conditions to optimize the cell’s performance
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