c-PCBSD, a cross-linked fullerene derivative, as a cathodic interlayer in wide-band gap perovskite solar cells

Abstract Wide-band gap absorber materials are prerequisites for well-performing tandem photovoltaic devices. Especially, perovskites received huge attention due to their tunable band and outstanding optoelectronic properties. Although perovskite solar cells known be highly efficient, high-open-circuit voltage losses remain a prevalent issue wide-band perovskites. Within this work, we have investigated the application of cross-linkable fullerene derivative [6,6]-phenyl-C61-butyric styryl dendron ester (c-PCBSD) as cathodic interlayer in cells. We could obtain increased open-circuit compared pristine devices, attributed fast electron transfer between interlayer. The changed charge carrier dynamics result reduction non-radiative losses, which consequently decreases loss. Graphical abstract