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Issue 45, 2014
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Perovskite processing for photovoltaics: a spectro-thermal evaluation

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Abstract

Thermal analysis (TGA and DSC), coupled with evolved gas FTIR spectroscopy, has been used to study the changes occurring during, and differences between materials after, the annealing step of mixed-halide methylammonium lead halide perovskites. This is important because, to date, the material is the most efficient light harvester in highly efficient, 3rd generation perovskite photovoltaic devices, and processing plays a significant role in device performance. TGA-FTIR data show only solvent evolution during the annealing step, whilst post-annealing analysis shows that the resulting material still contains a significant amount of residual solvent; however, efficient DMF removal was possible using a silica gel desiccant for a period of 3 days. The data also show that methylammonium halide decomposition does not occur until temperatures well above those used for perovskite processing, suggesting that this is not a significant issue for device manufacture. The absence of a well-defined, reversible tetragonal – cubic phase change around 55 °C in the DSC data of the annealed material, and the presence of HCl in evolved gas analysed following thermal decomposition, demonstrates that CH3NH3I3−xClx does retain some Cl after annealing and does not simply form stoichiometric CH3NH3PbI3 as has been suggested by some workers.

Graphical abstract: Perovskite processing for photovoltaics: a spectro-thermal evaluation

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Publication details

The article was received on 10 Sep 2014, accepted on 03 Oct 2014 and first published on 07 Oct 2014


Article type: Paper
DOI: 10.1039/C4TA04725G
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Citation: J. Mater. Chem. A, 2014,2, 19338-19346
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    Perovskite processing for photovoltaics: a spectro-thermal evaluation

    A. E. Williams, P. J. Holliman, M. J. Carnie, M. L. Davies, D. A. Worsley and T. M. Watson, J. Mater. Chem. A, 2014, 2, 19338
    DOI: 10.1039/C4TA04725G

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