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Efficient Photo- and Electroluminescence by Trap States Passivation in Vacuum-Deposited Hybrid Perovskite Thin Films

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Efficient Photo- and Electroluminescence by Trap States Passivation in Vacuum-Deposited Hybrid Perovskite Thin Films

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Dänekamp, Benedikt; Droseros, Nikolaos; Palazón Huet, Francisco; Sessolo, Michele; Banerji, Natalie; Bolink, Henk

Aquest document és un/a article, creat/da en: 2018

Methylammonium lead iodide (MAPI) has excellent properties for photovoltaic applications, although it typically shows low photoluminescence quantum yield (PLQY). Here we report on vacuum-deposited MAPI perovskites obtained by modifying the MAI to PbI2 ratio during vacuum deposition. By studying the excitation density dependence of the photoluminescence lifetime, a large concentration of trap states was deduced for the stoichiometric MAPI films. The use of excess MAI during vacuum processing is capable of passivating these traps, resulting in luminescent films which can be used to fabricate planar LEDs with quantum efficiency approaching 2%.

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