Transformation of PbI2, PbBr2 and PbCl2 salts into MAPbBr3 perovskite by halide exchange as an effective method for recombination reduction
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comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
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Title
Transformation of PbI2, PbBr2 and PbCl2 salts into MAPbBr3 perovskite by halide exchange as an effective method for recombination reductionAuthor (s)
Date
2017Publisher
Royal Society of ChemistryISSN
1463-9076; 1463-9084Bibliographic citation
Phys. Chem. Chem. Phys., 2017, 19, 10913Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/submittedVersionAbstract
Halide perovskite derivatives present unprecedented physical phenomena among those materials which
are suitable for photovoltaics, such as a fast ion diffusion coefficient. In this paper it is reported how the
benefits ... [+]
Halide perovskite derivatives present unprecedented physical phenomena among those materials which
are suitable for photovoltaics, such as a fast ion diffusion coefficient. In this paper it is reported how the
benefits of this property can be used during the growth of halide perovskites in order to control the
morphological and optoelectronic properties of the final thin film. Using a large enough halide reservoir,
the nature of the halides present in the final perovskite layer can be exchanged and this depends on the
initial salt used in the two-step deposition method. In particular, the preparation of a methylammonium
lead bromide (MAPbBr3) thin film is reported, using a two-step method based on the transformation of
lead(II) iodide (PbI2), lead(II) bromide (PbBr2) and lead(II) chloride (PbCl2) salts into MAPbBr3 perovskite
after dipping in a methylammonium bromide (MABr) solution. The films prepared from different salts
present different properties in terms of morphology and optoelectronic properties, thus providing
significantly different performance when they are used for the preparation of photovoltaic devices.
Interestingly, the use of PbI2 and PbCl2 salts reduce the charge recombination and increase the open
circuit potential obtained, especially in the former case. However, the highest photocurrent is obtained
when PbBr2 is used. For PbI2 and PbCl2 salts no traces of the former salt are observed in the MAPbBr3
layer obtained after 10 minutes of dipping time, however, the presence of PbBr2 has still been detected
(using X-ray diffraction) when this salt has been employed. [-]
Is part of
Phys. Chem. Chem. Phys., 2017, 19Investigation project
MAT2016-76892-C3-1-R ; MAT2015-70611-ERC ; PROMETEOII/2014/020Rights
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