Guanidinium stabilizes perovskite solar cells at 19 percent efficiency
(PHYSorg.com Chemistry)

With the power-conversion efficiency of silicon solar cells plateauing around 25%, perovskites are now ideally placed to become the market`s next generation of photovoltaics. In particular, organic-inorganic lead halide perovskites offer manufacturing versatility that can potentially translate into much higher efficiency: studies have already shown photovoltaic performances above 20% across different solar cell architectures built with simple and low-cost processes.