Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Publication date: 11th December 2017
Three-dimensional perovskite compound, MAPbI3, consisting of methylamine (MA) and lead iodide has been applied to a light absorber of solar cells because of wide range of light absorption and long carrier diffusion length. However, the low stability of MAPbI3 against moisture and heat should be improved. In this study, we focused on acetamidinium (AA) cation and introduced to MAPbI3 perovskite to identify the effect on the photovoltaic properties and its stability.
Precursor solution of MA0.85AA0.15PbI3 was prepared by mixing MAPbI3 and AAPbI3 precursor solutions at certain volume ratio. A MA0.85AA0.15PbI3 film was prepared by using the anti-solvent method with chlorobenzene. The structure and optical properties of a MA0.85AA0.15PbI3 film were investigated by X-ray diffraction (XRD) measurements and UV-vis absorption spectroscopy. Perovskite solar cells using MA0.85AA0.15PbI3 as a light absorption layer were fabricated to conduct power generation tests.
From the XRD measurements of a MA0.85AA0.15PbI3 film, strong peak at 14.1 º attributed to α-phase of MAPbI3 and small peak at 11.4 º attributed to δ-phase of AAPbI3 were observed. The existence ratio of α-phase of MAPbI3 calculated by integral intensity ratio of the peaks at 14.1 º and 11.4 º was 97.8%, which was higher than the preparation ratio. This indicated that AA cation can be incorporated into α-phase of MAPbI3 because both of perovskites has similar surface free energy. Furthermore, the d-spacing value of α-phase became larger than that of pure MAPbI3 film. This indicated that the introduction of AA cation to MAPbI3 expanded the lattice size of α-phase. From UV-vis absorption measurements, the range of light absorption of the MA0.85AA0.15PbI3 film was a few nm wider than that of pure MAPbI3 film. The power conversion efficiency (PCE) of perovskite solar cells using a MA0.85AA0.15PbI3 layer as a light absorber layer showed the highest performance (PCE: 14.6%), about 3% higher than that of using a MAPbI3 film (11.7%).
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