Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Two-dimensional hybrid perovskites are self-assembled quantum well structures that are electronically and spatially separated from one another by organic cations. By varying the precursor stoichiometry, the number of octahedral layers between spacing cations can be altered, resulting in control over the degree of quantum confinement. This quantum confinement leads to strongly excitonic behaviour, which has been exploited in the realization of LED architectures. However, while research on the spin states of bulk perovskites exists, only recently has the potential of 2d perovskites been investigated for use within the field of spintronics. This work analyses the excited state spin dynamics of 2d perovskites by means of circularly polarised femtosecond broadband transient absorption spectroscopy and photoluminescence measurements. We determine excited state spin relaxation lifetimes and analyse their dependence on the number of octahedral layers and choice of organic cations. By finding a balance between PLQE and spin lifetimes, we optimize the perovskite structure required to realize circularly polarised LEDs.
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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.
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