Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Superlattices of lead halide-based perovskite nanocrystals (SLs of LHP NCs) are submillimeter objects consisting of periodically-arranged NCs. Long-range translational order in three dimensions makes these SLs distinctly different from thin films of randomly oriented LHP NCs prepared by spin-coating or similar methods. Electronic coupling between LHP NCs in SLs gives rise to interesting optoelectronic behaviors such as tunable anisotropic photon emission and superfluorescence. Development of fabrication methods and deciphering of physical properties of SLs is required for rational integration of the SLs into devices such as photovoltaic elements, light emitting diodes, and lasers. In our contribution, we will present three advances aimed at filling this gap. SLs of cesium lead bromide NCs (CsPbBr3, an archetype LHP material) are at the center of the work.[1], [2]
First, a novel method of SL fabrication on the surface of the perfluorinated liquid has been developed; the method allows transfer of SLs across substrates, potentially easing the implementation of SLs into the device fabrication process. Second, the origin of the photoluminescence red shift in CsPbBr3 NC SLs has been investigated and found to be the combination of i) interparticle interactions, ii) impurities of bulklike CsPbBr3, and iii) the photon propagation effect. Third, the structural diversity of CsPbBr3 NC SLs has been correlated with a corresponding variety of their optical properties. In addition, we will discuss the emerging trends in LHP optoelectronics from the perspective of bottom-up fabrication based on NC self-assembly.
The work of D.B. was supported by the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 794560. The work of S.T. and L.M. was supported by the European Union under grant agreement No 614897 (ERC Grant TRANS-NANO).
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