Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO22)
DOI: https://doi.org/10.29363/nanoge.nipho.2022.007
Publication date: 11th November 2021
Metal halide perovskites are among the most promising materials for next generation photovoltaics, combining a convenient solution processability at mild temperature with excellent power conversion efficiencies, as over 25% in lab-scale devices.[1] Nonetheless, finding a truly scalable manufacturing process and improving the durability of perovskite materials under operational conditions are the next technological challenges to be faced before perovskite solar cells can enter the market.
The inherent and main limitations interfering with perovskite solar cell large-scale production are related to a critical material deposition/reproducibility, as the film formation occurs throughout a complex self-assembly process driven by weak interactions. Herein, we act on the perovskite material by using polymers as cooperative assembling component.[2-4] The use of polymers with pendant hydroxyl/hydroxyethyl groups, which can interact with the perovskite precursors already in solution, allowed to massively interfere with nucleation probabilities and growth rates of perovskite crystals, leading to the formation of compact and uniform film via a single straightforward coating step.[2,3] We found that the organic polymeric nature and the non-covalent interactions between adjacent chains confers superior flexibility and moisture stability to the perovskite-polymer films, enabling the composite material to accommodate a strain, whilst maintaining transport properties suitable for devices,[3] thus very attractive for flexible photovoltaics. A judicious polymer selection can in addition allow to modulate perovskite films transparency and improve its tolerance to thermal stress.[4]
Finally, we demonstrate that though the use of polymeric rheological modifier the viscosity of perovskite-polymer inks could be easily modulated and adapted to the requirements different up-scalable printing techniques. Overall, the superior film forming properties of polymeric materials guarantee the deposition of perovskites on large area flexible substrates without the use of the antisolvent-bath, thus significantly simplifying the large-scale processing.[5,6]
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