Effects of thermal treatment on organic-inorganic hybrid perovskite films and luminous efficiency of light-emitting diodes

Young Hoon Kim, Himchan Cho, Jin Hyuck Heo, Sang Hyuk Im, Tae Woo Lee

Research output: Contribution to journalArticle

20 Citations (Scopus)

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 languageEnglish
Pages (from-to)1069-1074
Number of pages6
JournalCurrent Applied Physics
Volume16
Issue number9
DOIs
Publication statusPublished - 2016 Sep 1
Externally publishedYes

Keywords

  • Crystallinity
  • Light-emitting diodes
  • Luminous efficiency
  • Organic-inorganic perovskite
  • Thermal treatment

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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