Amine-Based Passivating Materials for Enhanced Optical Properties and Performance of Organic-Inorganic Perovskites in Light-Emitting Diodes
Journal of Physical Chemistry Letters
American Chemical Society
MetadataShow full item record
Lee, S., Park, J., Lee, B., Jung, E., Yu, J., Di Nuzzo, D., Friend, R., & et al. (2017). Amine-Based Passivating Materials for Enhanced Optical Properties and Performance of Organic-Inorganic Perovskites in Light-Emitting Diodes. Journal of Physical Chemistry Letters, 8 (8), 1784-1792. https://doi.org/10.1021/acs.jpclett.7b00372
The use of hybrid organic-inorganic perovskites in optoelectronic applications are attracting an interest because of their outstanding characteristics, which enable a remarkable enhancement of device efficiency. However, solution-processed perovskite crystals unavoidably contain defect sites that cause hysteresis in perovskite solar cells (PeSCs) and blinking in perovskite light-emitting diodes (PeLEDs). Here, we report significant beneficial effects using a new treatment based on amine-based passivating materials (APMs) to passivate the defect sites of methylammonium lead tribromide (MAPbBr$_3$) through coordinate bonding between the nitrogen atoms and undercoordinated lead ions. This treatment greatly enhanced the PeLED's efficiency, with an external quantum efficiency (EQE) of 6.2%, enhanced photoluminescence (PL), a lower threshold for amplified spontaneous emission (ASE), a longer PL lifetime, and enhanced device stability. Using confocal microscopy, we observed the cessation of PL blinking in perovskite films treated with ethylenediamine (EDA) due to passivation of the defect sites in the MAPbBr$_3$.
KIST-UNIST partnership program (1.160097.01/2.160482.01), MidCareer Researcher Program (2015R1A2A2A01003263), Human Resource Training Program for Regional Innovation and Creativity through the Ministry of Education and National Research Foundation of Korea (NRF- 2014H1C1A1073051).
EPSRC (via Brunel University London) (unknown)
External DOI: https://doi.org/10.1021/acs.jpclett.7b00372
This record's URL: https://www.repository.cam.ac.uk/handle/1810/265119