Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.199
Publication date: 21st February 2018
Lead halide perovskites are ionic semiconductors that have recently revolutionized the photovoltaics field. Unlike in most photoactive materials, ionic conductivity plays a key role in perovskites during photovoltaic device operation. However, the physical characterization of the ionic conductivity has been rather elusive due to the highly intermixing of ionic and electronic current. 1, 2 In this work high efficiency and low defect density monocrystalline MAPbBr3 (MA=Methyl ammonium) solar cells free of hole transport layer (HTL) suppress the effect of electronic current.3 Impedance spectroscopy reveals the characteristic signature of ionic diffusion: the Warburg element and transmission line equivalent circuit in MAPbBr3 and ion accumulation at the MAPbBr3/Au interface typical for non-reactive contacts.4 Diffusion coefficients are calculated based on a good correlation between thickness of MAPbBr3 and characteristic diffusion transition frequency. In addition, a comparison of polycrystalline MAPbBr3 devices prepared either with Spiro-OMeTAD as an HTL or free of HTL allows the study of reactive external interfaces. The low frequency response in IS measurements is correlated with the chemical reactivity of moving ions with the external interfaces and diffusion into the HTL.
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Peng, W.; Aranda, C.; Bakr, O.; Garcia-Belmonte, G.; Bisquert, J.; Guerrero, A.
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Bisquert, J.; Fabregat-Santiago, F., Impedance Spectroscopy: A general Introduction and Application to Dye-Sensitized Solar Cells. In Dye-sensitized solar cells., Kalyanasundaram, K., Ed. CRC Press: Boca Raton, 2010.
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