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Rapid Crystallization of All-Inorganic CsPbBr3 Perovskite for High-Brightness Light-Emitting Diodes
journal contribution
posted on 2017-06-19, 08:13 authored by Yan Fong Ng, Nur Fadilah Jamaludin, Natalia Yantara, Mingjie Li, Venkata Kameshwar
Rao Irukuvarjula, Hilmi Volkan Demir, Tze Chien Sum, Subodh Mhaisalkar, Nripan MathewsResearch into perovskite-based light-emitting
diodes (PeLEDs) has
been rapidly gaining momentum since the initial reports of green-emitting
methylammonium lead bromide (CH3NH3PbBr3)-based devices were published. However, issues pertaining
to its stability and morphological control still hamper progress toward
high performing devices. Solvent engineering, a technique typically
employed to modulate film crystallization, offers little opportunity
for scale-up due to the tendency for inhomogeneous film growth and
low degree of reproducibility. Here, we propose and show a simple
gas-facilitated process to deposit a stable, all-inorganic perovskite
CsPbBr3 film. The formation of smaller and less percolated
grains, which gives rise to enhanced optical properties, highlights
the importance of spatial charge confinement in the film. Consequently,
the performance of our PeLEDs shows great improvement, with luminance
as high as 8218 cd m–2 and turn-on voltage as low
as 2.4 V. Concomitantly, the current efficiency and EQE of our device
were increased to 0.72 cd A–1 and 0.088%, respectively.
High reproducibility in the performance of PeLEDs fabricated using
this process opens the path for large-area devices.
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All-Inorganic CsPbBr 3 Perovskitecharge confinementEQEPeLEDperovskite-based light-emitting diodesgas-facilitated processfilm growthSolvent engineeringgreen-emitting methylammoniumHigh-Brightness Light-Emitting Diodes Research0.72 cdNHpercolated grainsCH2.4 VRapid Crystallizationall-inorganic perovskite CsPbBr 3 filmperformanceturn-on voltagedevicefilm crystallizationHigh reproducibility
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