6533b858fe1ef96bd12b633c
RESEARCH PRODUCT
Efficient Photo- and Electroluminescence by Trap States Passivation in Vacuum-Deposited Hybrid Perovskite Thin Films
Henk J. BolinkBenedikt DänekampFrancisco PalazonNatalie BanerjiMichele SessoloNikolaos Droserossubject
Materials sciencePhotoluminescencePassivationbusiness.industryQuantum yield02 engineering and technologyElectroluminescence010402 general chemistry021001 nanoscience & nanotechnology7. Clean energy01 natural sciences0104 chemical sciencesVacuum depositionOptoelectronicsQuantum efficiencyGeneral Materials ScienceThin film0210 nano-technologybusinessMaterialsCèl·lules fotoelèctriquesPerovskite (structure)description
Methylammonium lead iodide (MAPI) has excellent properties for photovoltaic applications, although it typically shows low photoluminescence quantum yield. Here, we report on vacuum-deposited MAPI perovskites obtained by modifying the methylammonium iodide (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 light-emitting diodes with quantum efficiency approaching 2%.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-09-25 |