Influence of Composition on Stability of Perovskite Light Emitting Diodes
Jonathan Warby a, Henry Snaith a
a University of Oxford, Department of Physics, Clarendon Laboratory, Parks Road, Oxford, OX13PU, UK
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Jonathan Warby, 264
Publication date: 11th February 2019

In recent years lead halide perovskites have emerged as highly attractive materials for use in optoelectronic devices. Light-emitting diodes (LEDs) with low dimensional perovskite based semiconductors as the emissive layer with high colour purity, external quantum efficiency and current efficiency have recently been demonstrated[1,2]. In 2015 Protesescu et al. reported a facile sysnthesis of fully inorganic cesium based perovskite nanocrystals which displayed very narrow emission and extremely high photoluminescence quantum yields[3], these also have successfully been incorporated into efficient LEDs [4]. Although efficient LEDs based on metal halide perovskites using these two strategies have been demonstrated, little work has been done on improving the stability with devices lasting from seconds to several hours [1,2]. In this work we look into the influence of the chemical composition of the perovskite film on the operation stability of LEDs. Having assessed the influence of the composition a device optimised for stability is presented, providing insight into routes for more stable perovskite LEDs

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