Abstract
We report the synthesis of organometal halide perovskites by milling CH3NH3I and PbI2 directly with an Al2O3 scaffold to create hybrid Al2O3-CH3NH3PbI3 perovskites, without the use of organic capping ligands that otherwise limit the growth of the material in the three dimensions. Not only does this improve the ambient stability of perovskites in air (100 min versus 5 min for dimethylformamide (DMF)-processed material), the method also uses much fewer toxic solvents (terpineol versus dimethylformamide). This has been achieved by solid-state reaction of the perovskite precursors to produce larger perovskite nanoparticles. The resulting hybrid perovskite–alumina particles effectively improve the hydrophobicity of the perovskite phase whilst the increased thermal mass of the Al2O3 increases the thermal stability of the organic cation. Raman data show the incorporation of Al2O3 shifts the perovskite spectrum, suggesting the formation of a hybrid 3D mesoporous stack. Laser-induced current mapping (LBIC) and superoxide generation measurements, coupled to thermogravimetric analysis, show that these hybrid perovskites demonstrate slightly improved oxygen and thermal stability, whilst ultra-fast X-ray diffraction studies using synchrotron radiation show substantial (20×) increase in humidity stability. Overall, these data show considerably improved ambient stability of the hybrid perovskites compared to the solution-processed material.
Highlights
The meteoric rise in operating efficiency of perovskite solar cells (PSCs) from ca. 12% in 2012 [1]to 23% [2] has generated enormous interest in the technology
2O3Al2 O3 -CH3 NH3 PbI3 perovskite films made without a compression step are not well suited to make PV
3NH3PbI3 perovskite films made without a compression step are not well suited to make PV devices devices but, because this is less relevant here because this study is focussed on material stability
Summary
The meteoric rise in operating efficiency of perovskite solar cells (PSCs) from ca. 12% in 2012 [1]. Whilst a 1 year PSC device has been reported [3], issues remain regarding their ambient stability. In order for scale up and to prove the efficacy of PSC technology, low-cost raw materials and processing need to be developed, which leads to stable absorber materials. We report all-ambient synthesis and processing of organolead perovskites by pairing the perovskite precursors. [9],we wereported reportedthe thedeposition deposition of of aa thick thick layer layer of of this paper this hybrid hybrid mesoporous mesoporousperovskite perovskitestack stackusing using blade casting. This produced a non-uniform layer with large voids.
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