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

In this paper, the interface between CsPbIBr2 perovskite and carbon electrode is modified with 2-iodoaniline to facilitate hole extraction in solar cell devices, and the modified photoelectric conversion efficiency can reach 10.23%, which improves the moisture stability of the device to a certain extent. [Display omitted] •The interface between CsPbIBr2 perovskite and carbon electrodes was modified with 2-iodoaniline.•The 2-iodoaniline can be coordinated with positively charged Lewis acid defects via coordination bonds.•It can inhibit the production of non-radiative recombination.•The PCE of CsPbIBr2 solar cells has increased from 8.26% to 10.23%.•The long-term stability exceeds 350 h under environmental conditions of RH = 35 ∼ 55 %. 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.