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

doi:10.1016/j.cap.2016.06.002

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 journal › Article › peer-review

24 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 t_ann 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, t_ann ≤ 10 min increased its crystallinity by eliminating residual solvent and completing the conversion of precursor to crystal, but t_ann > 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 t_ann = 10 min. These results demonstrate that optimizing t_ann of CH₃NH₃PbBr₃ films is a simple way to improve the luminous efficiency of PrLEDs by controlling their crystallinity.

Original language	English
Pages (from-to)	1069-1074
Number of pages	6
Journal	Current Applied Physics
Volume	16
Issue number	9
DOIs	https://doi.org/10.1016/j.cap.2016.06.002
Publication status	Published - 2016 Sept 1
Externally published	Yes

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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10.1016/j.cap.2016.06.002

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

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.",

keywords = "Crystallinity, Light-emitting diodes, Luminous efficiency, Organic-inorganic perovskite, Thermal treatment",

author = "Kim, {Young Hoon} and Himchan Cho and Heo, {Jin Hyuck} and Im, {Sang Hyuk} and Lee, {Tae Woo}",

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: {\textcopyright} 2016 Elsevier B.V. All rights reserved.",

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AU - Lee, Tae Woo

N1 - 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.

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Y1 - 2016/9/1

N2 - 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.

AB - 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.

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

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