Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 50, Pages 44106-44113Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b14544
Keywords
organic-inorganic perovskite; gas-assisted crystallization; nano-sized grain; composite film; light-emitting diodes
Funding
- Samsung Research Funding Center of Samsung Electronics [SRFC-MA1301-07]
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The morphology of perovskite films has a significant impact on luminous characteristics of perovskite light-emitting diodes (PeLEDs). To obtain a highly uniform methylammonium lead tribromide (MAPbBr(3)) film, a gas-assisted crystallization method is introduced with a mixed solution of MAPbBr(3) precursor and polymer matrix. The ultrafast evaporation of the solvent causes a high degree of supersaturation which expedites the generation of a large number of nuclei to form a MAPbBr(3)-polymer composite film with full surface coverage and nano-sized grains. The addition of the polymer matrix significantly affects the optical properties and morphology of MAPbBr(3) films. The PeLED made of the MAPbBr(3)-polymer composite film exhibits an outstanding device performance of a maximum luminance of 6800 cd.m(-2) and a maximum current efficiency of 1.12 cd.A(-1). Furthermore, 1 cm(2) area pixel of PeLED displays full coverage of a strong green electroluminescence, implying that the high-quality perovskite film can be useful for large-area applications in perovskite-based optoelectronic devices.
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