Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.099
Publication date: 11th July 2022
Formamidinium lead iodide (FAPbI3) is the 3D lead perovskite with the highest theoretical efficiency due to its narrower band gap in comparison with Cs or methylammonium perovskites. Unfortunately, the black phase allowing this narrow bandgap is not the most stable one at room temperature. Here, we shown as the fabrication conditions and the interaction with semiconductor quantum dots can boost significantly the stability of FAPbI3. The interaction of halide perovskite and colloidal semiconductor nanostructures (quantum dots or nanoplatelets) can produce interesting synergistic interactions. We show that the interaction of PbS quantum dots and nanoplatelets can produce the stabilization of FAPbI3and FACsPbI3 perovskite black phase and also the increase of the efficiency, stability and reproducibility of the photovoltaic devices prepared with these halide perovskites. Incorporation of PbS QDs allows the dramatic decrease of the annealing temperature for the formation of black FAPbI3 phase perovskite thin film, from the 170ºC required without QDs to 85ºC when QDs are present. In addition, stability of these systems including embedded nanostructures is extended not just for samples prepared in the glove box but fabricated in ambient conditions. In addition, fabrication of devices under air condition can further increase the stability of FAPbI3. We have also verified the synergic combination of different additives for a significant increase of device stability. These result points the interest of Perovskite-Quantum Dot Nanocomposites, for further development of advanced optoelectronic devices. Stabilization of tin based perovskite solar cells will be analyzed. Eventually, stabilization of halide perovskite nanoparticles is a necessary step for the development of high performance Halide Perovskite LEDs. Control of post synthetic washing processes allows the preparation of LEDs with enhanced performance and stability.
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Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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