Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.205
Publication date: 23rd September 2021
Relatively large organic cations, which on their own cannot stabilize the 3D corner-sharing perovskite framework, can be incorporated in perovskites by appropriate mixing with smaller 3D perovskite-forming cations. Here we utilize the solvent acidolysis crystallization (SAC) technique to grow mixed dimethylammonium/methylammonium (DMA/MAPbBr3) lead tribromide crystals with the highest, as of yet, dimethylammonium (DMA) incorporation of 44% while maintaining the 3D cubic phase. We then employ different temperature-dependent measurements to explore the implications of such mixed organic cations composition on the structural and optoelectronic properties at low temperatures. We confirm the suppression of the orthorhombic phase upon the incorporation of DMA and a lower tetragonal-cubic phase transition temperature. The anomalous enhancement in the integrated PL observed in the two crystals is due to the different organic cation dynamics. By fabricating charge extraction layer-free photodetectors, we observed that the mixed crystal devices showed higher detectivity and responsivity compared to MAPbBr3 crystals due to the observed structural compression and reduced surface trap density in the mixed crystals. Fascinatingly, the mixed crystal photodetectors, at 200 K, exhibit a large improvement in their characteristics compared to room temperature, while MAPbBr3 crystals demonstrate much lesser enhancement due to their higher degree of distortion at lower temperatures.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
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.
International Conference on Hybrid and Organic Photovoltaics
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.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.