Abstract
To improve the electroluminescence efficiency of organic-inorganic hybrid perovskite (OIP) films, we need to consider several different types of post-treatments after film formation such as thermal annealing and solvent annealing. Here, we only applied thermal treatment on the film excluding all the other treatments. Then, we analyzed the effects of annealing time tann on crystallinity of methylammonium lead bromide (CH3NH3PbBr3) films and on luminous efficiency of CH3NH3PbBr3-based perovskite light-emitting diodes (PrLEDs). When thermal annealing of CH3NH3PbBr3 films was conducted at 90 °C, tann ≤ 10 min increased its crystallinity by eliminating residual solvent and completing the conversion of precursor to crystal, but tann > 10 min reduced crystallinity and caused slight sublimation of CH3NH3Br. This was consistent with trend of the luminous efficiency of our PrLEDs that showed the optimum performance at tann = 10 min. These results demonstrate that optimizing tann of CH3NH3PbBr3 films is a simple way to improve the luminous efficiency of PrLEDs by controlling their crystallinity.
Original language | English |
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Pages (from-to) | 1069-1074 |
Number of pages | 6 |
Journal | Current Applied Physics |
Volume | 16 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2016 Sept 1 |
Externally published | Yes |
Bibliographical note
Funding Information:This research was supported by the Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (MSIP, Korea) ( NRF-2014M3A7B4051747 ).
Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.
Keywords
- Crystallinity
- Light-emitting diodes
- Luminous efficiency
- Organic-inorganic perovskite
- Thermal treatment
ASJC Scopus subject areas
- General Materials Science
- General Physics and Astronomy