Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV24)
DOI: https://doi.org/10.29363/nanoge.hopv.2024.107
Publication date: 6th February 2024
Piezoelectricity is the phenomena of strain-induced electric polarization or vice versa; electric-field induced strain, with applications ranging from actuators, to vibrational energy harvesters. Organic-inorganic hybrid (OIH) ferro- and piezo-electric materials have recently attracted interest over traditional piezo-ceramics due to simpler processing methods, their light-weight nature, mechanical flexibility and lower toxicity compared to traditional ceramics [1,2,3]. Recent reports have shown that by incorporation of a ferroelectric OIH perovskite into a (FA,MA)Pb(I,Br)3 perovskite solar cell device, and poling it, a higher fill factor and VOC is achieved via suppression of interfacial recombination due to ferroelectricity-induced modification of the built-in field [4]. Further, molecular ferro- and piezo-electrics often have bandgaps within the optical range, and have thus been studied for their anomalous photovoltaic properties arising from their intrinsic non-centrosymmetry which allows for above-bandgap open-circuit voltage (VOC) to be measured [5]. Here, we design a novel, stable lead-free semiconducting hybrid halide ferroelectric OMX, which crystallizes in a polar space group at room temperature, and exhibits a band gap within the optical range (2.3 eV), in close agreement with that calculated from first-principles methods. Piezoresponse force microscopy (PFM), polarization hysteresis loops and pyroelectric measurements on both single crystals and thin films of OMX reveal its ferroelectric nature, indicating potential applications for flexible self-powered electronics or bio-sensors as well as for ferroelectricity-induced enhancements to the performance of perovskite solar cells.
E.Y.-H.H. thanks Xaar for PhD scholarship sponsorship.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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