Excellent quinoline additive in perovskite toward to efficient and stable perovskite solar cells

The ionic nature of the perovskite material results in a great number of defects in the perovskite film which limits the efficiency and stability of perovskite solar cells. The passivation of the defects can effectively suppress the non-radiative recombination of carriers and improve the photovoltaic performance and stability of perovskite solar cells. In this paper, quinoline is introduced into the perovskite precursor solution. By adjusting the addition amount, it is found that quinoline can effectively induce the growth and orientation of perovskite crystals, consequently, improving the film quality and reduce defect density. The optimized device shows higher VOC (1.142 V) and FF (0.792), and achieved a champion power conversion efficiency of 20.87%. In addition, the hysteresis of the device is suppressed and the stability is improved. The results demonstrate that quinoline is an effective perovskite additive.