Highly-improved performance of inverted planar perovskite solar cells by glucose modification

High-quality perovskite films play a vital role in determining the performance of inverted perovskite solar cells. Here, for the first time, glucose is introduced to realize high quality MAPbI(3) perovskite film, boosting the power conversion efficiency from 17.53% to 20.15% with an inverted planar configuration. In addition, all device parameters exhibit excellent reproducibility. More encouragingly, the current-voltage hysteresis is significantly suppressed in terms of the hysteresis index (control device: 0.083, glucose-modified device: 0.035). It is found that glucose could contribute to the enlargement of grain size and the decrease of grain boundaries in perovskite film. The decreased defect density and corresponding suppressed charge recombination account for the enchancement of J(sc) and FF. Meanwhile, the stability of glucose-modified devices under conditions of heat, light and moisture is significantly improved. These findings indicate the eminent effects of glucose on performance optimization and stability enhancement of perovskite solar cells, which is potentially promising for other optoelectronic applications.