Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
The organic-inorganic methylammonium lead triiodide, CH3NH3PbI3 (MAPbI3), is a photovoltaic perovskite material with outstanding optoelectronic properties, such as a very high visible light absorption coefficient, balanced electron and hole transport accompanied by high charge carrier mobilities and long diffusion lengths, as well as a very strong photoluminescence (PL) [1‑3]. So far, there have been numerous reports on crystallinity and morphology as well as PL properties of MAPbI3 obtained either in the form of single-crystalline particles [4, 5] or polycrystalline films deposited on planar substrates [6, 7].
Here, we report on the fabrication and characterization of polycrystalline deposits of MAPbI3 on strongly curved substrates. Specifically, polycrystalline films of MAPbI3 were deposited on the surface of quartz rods having diameters in the range of 80–1800 µm by one-step solution-casting from the dimethylformamide (DMF) solution containing stoichiometrically mixed halide perovskite precursors.
The optical microscopy and electron scanning microscopy images revealed a pronounced dependence of the crystallinity and morphology of the obtained deposits on the substrate curvature. On quartz rods with the smallest diameters (80‑330 µm), MAPbI3 formed densely-packed deposits of micrometer-sized wires, ca. 2 µm thick and 20 µm long. In contrast, on substrates having larger diameters (700‑1800 µm), MAPbI3 formed rather loose, dandelion-like structures, containing also a large number of voids.
The cylindrical geometry and large surface area of the MAPbI3 deposits encouraged us to try to apply our samples for gas sensing. Placed in a larger diameter capillary and fitted with gas inlet and outlet the deposits were exposed to three different gaseous media: Oxygen (O2), Nitrogen (N2) and Argon (Ar). The PL response has been recorded and showed a pronounced difference between O2 and N2, while Ar seemed to have the same effect as N2.
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[2] NREL, Best research-cell efficiencies (2016).
[3] A.R. Bin Mohd Yusoff and M.K. Nazeeruddin, J. Phys. Chem. Lett., 2016, 7, 851−866.
[4] G. Grancini et al., Chem. Sci., 2015, 6, 7305.
[5] C. Zhao et al., Sci. Bull., 2016, 61(9), 665–669.
[6] A.D. Wright et al., Nature Communications, 2016, 7, 11755.
[7] C. Li et al., Molecules, 2016, 21, 1081.
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