Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Perovskite solar cells (PSCs) have gained increasing interest, especially after reaching performances which are comparable with mature silicon PV technologies. However, the perovskite crystalline structure CH3NH3PbI3 is unstable in the presence of moisture, which leads to fast degradation under ambient conditions. The commercialisation of halide perovskite solar cells will only be achieved with the engineering of long term stable materials. Over the last few years, numerous approaches have been investigated to improve the stability of PSCs. Herein, we report a very simple one-step solution processing strategy to enhance the stability of perovskite solar cells towards moisture. The modified perovskite absorber layer is obtained by adding methylammonium iodide (MAI) and tetrabutylammonium (TBA) iodide. [1] The incorporation of TBA improves the film coverage, reducing the number of pinholes. X-ray diffraction analysis suggests that two distinct phases coexist: a 3D perovskite material and a 2D layered material. The TBA containing perovskite films showed improved hydrophobicity, which contributed to significantly higher moisture stability. The cells maintained their original PCE after 45 days under ambient conditions without encapsulation. In comparison, the CH3NH3PbX3 3D perovskite device lost more than 60% of its original efficiency over the same time. Solar cells with high mol% TBA were found to have reasonable efficiencies while being semi-transparent, making them attractive for PV’s window applications.
[1] I. Poli et al., J. Mater. Chem. A, 2017, 10.1039/c7ta06735f
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