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Kim, BongSoo
Polymer & Organic Semiconductor Lab.
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Improvement in performance of inverted polymer solar cells by interface engineering of ALD ZnS on ZnO electron buffer layer

Author(s)
Zafar, MuhammadKim, BongSooKim, Do-Heyoung
Issued Date
2019-07
DOI
10.1016/j.apsusc.2019.03.257
URI
https://scholarworks.unist.ac.kr/handle/201301/33046
Fulltext
https://www.sciencedirect.com/science/article/pii/S0169433219308888?via%3Dihub
Citation
APPLIED SURFACE SCIENCE, v.481, pp.1442 - 1448
Abstract
Atomic layer deposition (ALD) is an effective coating technique for angstrom- to nanometer-scale film deposition; its advantages include uniform and conformal coverage, controlled thickness, high reproducibility, and facile synthesis of various functional materials. In this study, we analyzed sol–gel-processed ZnO films coupled with interface-engineered ALD ZnS as electron buffer layers (EBLs) for inverted polymer solar cells (IPSCs). The thickness of the ZnO film was optimized to 10 nm by adjusting the solution concentration. Subsequently, we investigated the effect of the thickness of the ALD ZnS (formed on top of the ZnO film using diethyl zinc and H 2 S gas) on the photovoltaic properties of the IPSCs. The IPSC device fabricated with 1.8 nm-thick ALD ZnS on ZnO EBL (ZnS C) exhibited a power conversion efficiency (PCE) of 3.17%, which represents a 22% increase over that of equivalent reference cell devices containing only a pristine ZnO EBL. Characterization of the ZnO and ALD ZnS on the ZnO films revealed that the ALD ZnS films reduced the electron resistivity and surface defects of the ZnO films; this in turn reduced the interfacial carrier recombination in the IPSCs. Overall, we demonstrated that the interface engineering of ALD ZnS favorably influenced the electrical properties of the ZnO films.
Publisher
Elsevier B.V.
ISSN
0169-4332
Keyword (Author)
Electron buffer layerInverted polymer solar cellZinc oxideZinc sulfide, ALD films
Keyword
Atomic layer depositionBuffer layersCell engineeringElectronsMetallic filmsNanostructured materialsOxide filmsPhotovoltaic effectsPolymer filmsPolymer solar cellsSolar cellsSolsSulfur compoundsSurface defectsZinc oxideZinc sulfideCarrier recombinationElectron buffer layersHigh reproducibilityInterface engineeringInverted polymer solar cellsPhotovoltaic propertyPower conversion efficienciesSolution concentrationII-VI semiconductorsFunctional materials

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