Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
Hybrid (organic-inorganic) perovskites have become widely studied semiconducting materials, mostly due to their impressive photovoltaic performances. These are consequence of their unique properties, such as high absorption coefficient, high carrier mobility and long range carrier diffusion. On the other hand, the optical and electronic properties of hybrid perovskites vary largely with the material composition and morphology. Recently, hybrid perovskites such as methylammonium lead bromide (MAPbBr3) have emerged as potential candidate for future electroluminescent devices. Generally, in LEDs, a high photoluminescence quantum yield (PLQY) of the active layer is desirable, since it is thought to determine the final efficiency of the device. Unfortunately, when the pure MAPbBr3 is prepared by simple solution methods (single step spin-coating of the precursor solution), its PLQY is rather limited, at least if measured at low excitation intensity. In analogy to inorganic semiconductors, the most promising strategy to promote radiative recombination is the spatial confinement of the charge carriers. In this work we present strategies to improve the PLQY of hybrid perovskites by limiting their growth using a template material (i.e. polymer, small molecule or a porous inorganic scaffold) which is compatible with the solution processing of highly luminescent thin-films. The structural and optical properties, together with the application of such materials in LEDs, will be discussed.
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