Guanidinium tetrafluoroborate (GuaBF4), CAS number 36595-00-3, a functional ionic material, is a guanidinium pseudo-halide salt which is normally used as an additive in in wide-bandgap perovskite solar cells.

With guanidinium tetrafluoroborate as the additive in the active layer materials, CH3NH3PbI3/PCBM for surface treatment, the power conversion efficiency (PCE) of devices increases from 18.09% to 20.54% for small devices (active area 0.10 cm2) and from 12.35% to 15.52% for large devices (active area 1.0 cm2). It is believed that the GuaBF4 surface treatment not only promotes charge carrier transport and extraction between the CH3NH3PbI3/PCBM interface, but also endows the CH3NH3PbI3 film with larger grains, smoother surface, higher crystallinity, efficiently passivated surface defects and optimized interfacial energy level alignment. Additionally, the surface treatment displays reduced hysteresis behaviour, increased moisture stability. The unencapsulated devices exhibit no performance degradation after storage in dry air for 1000 hours.

General Information

Product Details

Chemical Structure