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CsPbBr3 Perovskite Quantum Dot Light-Emitting Diodes Using Atomic Layer Deposited Al2O3 and ZnO Interlayers

Title
CsPbBr3 Perovskite Quantum Dot Light-Emitting Diodes Using Atomic Layer Deposited Al2O3 and ZnO Interlayers
Authors
Yun, Hwang-SikNoh, KyeongchanKim, JigeonNoh, Sung HoonKim, Gi-HwanLee, WoongkyuNa, Hyon BinYoon, Tae-SikJang, JaeyoungKim, YounghoonCho, Seong-Yong
DGIST Authors
Kim, Younghoon
Issue Date
2020-01
Citation
Physica Status Solidi - Rapid Research Letetrs, 14(1)
Type
Article
Article Type
Article
Author Keywords
atomic layer depositioninterlayerslight-emitting diodesperovskitesquantum dots
Keywords
HIGHLY LUMINESCENTHIGH-EFFICIENCYTHERMAL-STABILITYSOLAR-CELLSNANOCRYSTALSBREMISSIONCSPBX3LIGANDGROWTH
ISSN
1862-6254
Abstract
Most CsPbBr3 perovskite quantum dot light-emitting diodes (PQD-LEDs) are fabricated with an inverted device structure where hole transport/injection layers are vacuum-deposited on top of ITO/ZnO (as an electron transport layer (ETL))/PQDs. Standard device architecture of PQD-LEDs enables a solution-process of device fabrication; however, the spin-coating of ZnO ETL dissolved in polar solvent results in decreasing photoluminescence (PL) of PQDs because of PQD destabilization in polar medium. Herein, CsPbBr3 PQD-LEDs are fabricated by depositing Al2O3 and ZnO via atomic layer deposition (ALD) to avoid damages originating from the polar solvent during ZnO ETL spin-coating. Low temperature ALD is adopted to prevent the coarsening of the CsPbBr3 PQDs. A thicker Al2O3 interlayer can prevent PL quenching, but an excessively thick interlayer hinders electron transport due to the insulating nature of Al2O3. ZnO is sequentially deposited on Al2O3 interlayer via ALD, and therefore Al2O3/ZnO bilayer structure is used because of its better electron transporting ability and higher power efficiency in PQD-LED devices compared with Al2O3-only devices. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
http://hdl.handle.net/20.500.11750/10940
DOI
10.1002/pssr.201900573
Publisher
Wiley - VCH Verlag GmbH & CO. KGaA
Related Researcher
Files:
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Collection:
Division of Energy Technology1. Journal Articles


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