期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 42, 页码 36187-36193出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b13100
关键词
perovskites; light-emitting diodes; vacuum deposition; passivation; stoichiometry
资金
- European Union H2020 project INFORM [675867]
- European Union for his Marie Sklodowska-Curie Grant [PerovSAMs-747599]
- Universities of Fribourg and Bern, Switzerland
- Spanish Ministry of Economy and Competitiveness (MINECO) via the Unidad de Excelencia Maria de Maeztu [MDM-2015-0538, MAT2017-88821-R, PCIN-2015-255, PCIN-2017-014]
- Generalitat Valenciana [Prometeo/2016/135]
- MINECO
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%.
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