Innovative Interface Materials for Perovskite Photovoltaics

Suitable interface materials are highly critical for single-junction but also tandem Perovskite photovoltaics both in terms of power conversion efficiency and, particularly, stability. Using its long experience with fullerenes and fullerene derivatives addressing improved performance of organic photovoltaic devices as starting point, Nano-C has developed a range of new generation electron transporting interface materials allowing for passivation and prevention of delamination. C60 or C70 fullerenes bearing suitable functional groups such as phosphonic, carboxylic or ammonium chloride/iodide allow for the stabilization of the Perovskite phase and adhesion on the adjacent metal oxide layers. Electronic properties can be adjusted for optimized band alignment depending on the specific Perovskite phase used. Molecules synthesized by Nano-C will be described and use cases discussed. The industrial scale manufacturing of fullerenes and new generation fullerene derivatives intended to accelerate the commercial deployment of Perovskite technology will be presented.