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Fine control of perovskite crystallization and reducing luminescence quenching using self-doped polyaniline hole injection layer for efficient perovskite light-emitting diodes

Cited 40 time in Web of Science Cited 39 time in Scopus
Issue Date
2019-02
Citation
Advanced Functional Materials, Vol.29 No.6, p. 1807535
Keywords
crystal structureexciton confinementexciton quenchinghole injection materialperovskite light-emitting diode
Abstract
Organic-inorganic hybrid perovskites (OHPs) are promising emitters for light-emitting diodes (LEDs) due to the high color purity, low cost, and simple synthesis. However, the electroluminescent efficiency of polycrystalline OHP LEDs (PeLEDs) is often limited by poor surface morphology, small exciton binding energy, and long exciton diffusion length of large-grain OHP films caused by uncontrolled crystallization. Here, crystallization of methylammonium lead bromide (MAPbBr(3)) is finely controlled by using a polar solvent-soluble self-doped conducting polymer, poly(styrenesulfonate)-grafted polyaniline (PSS-g-PANI), as a hole injection layer (HIL) to induce granular structure, which makes charge carriers spatially confined more effectively than columnar structure induced by the conventional poly(3,4-ethylenedioythiphene):polystyrenesulfonate (PEDOT:PSS). Moreover, lower acidity of PSS-g-PANI than PEDOT:PSS reduces indium tin oxide (ITO) etching, which releases metallic In species that cause exciton quenching. Finally, doubled device efficiency of 14.3 cd A(-1) is achieved for PSS-g-PANI-based polycrystalline MAPbBr(3) PeLEDs compared to that for PEDOT:PSS-based PeLEDs (7.07 cd A(-1)). Furthermore, PSS-g-PANI demonstrates high efficiency of 37.6 cd A(-1) in formamidinium lead bromide nanoparticle LEDs. The results provide an avenue to both control the crystallization kinetics and reduce the migration of In released from ITO by forming OIP films favorable for more radiative luminescence using the polar solvent-soluble and low-acidity polymeric HIL.
ISSN
1616-301X
URI
https://hdl.handle.net/10371/164485
DOI
https://doi.org/10.1002/adfm.201807535
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Journal Papers (저널논문_재료공학부)
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