2-Iodoaniline-Modified High-Efficiency Carbon-Based CsPbIBr2 perovskite solar cells

Abstract

The stability of carbon-based perovskite solar cells without a hole transport layer is better than that of hybrid perovskite solar cells, However, there will be serious interface recombination and carrier transport inhibition at the perovskite/carbon interface. Therefore, the interface between CsPbIBr2 perovskite and carbon electrodes was modified with 2-iodoaniline (2-IDA) to facilitate hole extraction in solar cell devices. –NH2 has a lone pair of electrons that can be coordinated with positively charged Lewis acid defects via coordination bonds. In addition, the introduction of iodide ions can compensate the halide vacancy on the grain boundary, inhibit the production of non-radiative recombination and passivate the defects in the film. After modification, the open-circuit voltage decays more slowly and the carrier lifetime is longer, resulting in a photoelectric conversion efficiency of 10.23% and Improve the moisture stability of the device.