Combined Dynamics and Nanostructure Analyses for Paths that Maximize NFA Solar Cell Performance

Organic solar cells stand on the precipice of >20% efficiencies and large-scale commercialization. Unfortunately, constrictive processing options and a lack of direct connections between nanostructure, device dynamics, and performance hold back the promise of this exciting technology. I will describe our efforts in combining device-relevant loss analyses with quantitative nanostructure characterization to reveal key considerations in maximizing device performance. In particular, one barrier to scaleup is runaway crystallinity of NFA solar cells where slight fluctuations in additive concentrations compromise even lab-scale devices. We find that expanding processing toward non-halogenated additives both halt runaway crystallinity and work toward less-toxic manufacturing. However, only a detailed connection between the new morphology and device dynamics can reveal the opportunities for further improvements. Applying these processing and measurement strategies will be critical to understanding and mastering new materials breakthroughs that launch the technology toward a new solar future.