Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Lead halide perovskites have emerged within the last 5 years as a highly promising semiconductor, not only exceeding 20% efficiency in solar cells but also showing their potential for light-emitting applications. A potential for improvement of this material lies in the usage of perovskite nanoparticles. To this end we investigate the quantum size effect in colloidal organometal halide perovskite nanoplatelets. By tuning the ratio of the organic cations used, we can control the thickness, and consequently the photoluminescence emission of the platelets. Quantum mechanical calculations match well with the experimental values. We find that not only do the properties of the perovskite but also those of the organic ligands play an important role. Stacking of nanoplatelets leads to the formation of minibands, further shifting the bandgap energies. The additional deviations in the calculation likely originate from the large exciton binding energy in these greatly confined structures. Understanding of the quantum size effects in perovskite nanoplatelets and the ability to tune them provide an additional method with which to manipulate the optical properties of organometal halide perovskites. This should lead to enhanced functionalities in applications, such as light-emitting devices and biosensors.
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