Cathode Interface Layer Based on Organosilica Nanodots for Efficient and Stable Inverted Organic Solar Cells

The interface layer greatly affects the performance of organic solar cells (OSCs). In this paper, we selected an amino-containing silane molecule (AEEA) and four fluorescein molecules with different functional groups to prepare a series of cathode interface materials based on organosilica nanodots (OSiNDs) by one-step hydrothermal synthesis, in order to research the impact of functional groups on the performance of OSC devices. The good film crystallinity and carrier mobility without high-temperature annealing endowed the OSCs with high Voc and Jsc, and the best efficiency of 15.91% was reached with the OSi-ErB cathode interlayer. Moreover, compared with ZnO devices, OSiND-based devices showed highly improved light stability after UV irradiation.