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The intermediate-dimensional hybrid mixed-organic perovskite active layers PEA 2 (CH 3 NH 3 )n−1 (PbI 2 )nand Dodec 2 (CH 3 NH 3 )n−1 (PbI 2 )nwith various  n  values were successfully fabricated. Their characteristics were compared to find out a promising candidate for solar cell applications. The appropriate layer thickness of the films was tuned by a variation of n values based on stoichiometry. The physical appearance, crystal structure, surface morphology, chemical bonding, optical properties, stability to the heat and humidity, and power conversion efficiency of all films were examined thoroughly to determine their potential. For low  n  values of both film types, they showed the quasi-2D characteristic improving the film stability and conversion efficiency. The absorption edge of both types of materials shifted to a higher energy side and the electronic band gap increased with the decrease of  n  values. The mixed phase and MAPbI 3  perovskite diffraction peaks were still observable even after time has passed for 72 h. Under the 60% humidity condition, the PEA-doped MAPbI 3  films decomposed slower than the Dodec-doped MAPbI 3  films.

Comparative Properties Investigations of Organic Doped Hybrid-Perovskite Solar Cells