A Novel p-Type ZnCoxOy Thin Film Grown by Atomic Layer Deposition

Reported herein is the atomic layer deposition (ALD) of novel ternary ZnCoxOy films possessing p-type semiconducting behavior. The preparation comprises of optimized ZnO and Co3O4 deposition in sub-cycles using the commercially available precursors cyclopentadienylcobalt dicarbonyl (CpCo(CO)2), diet...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-09, Vol.12 (19), p.3381
Main Authors: Li, Leyi, Wan, Zhixin, Wen, Quan, Lv, Zesheng, Xi, Bin
Format: Article
Language:English
Subjects:
atomic layer deposition (ALD)
Atomic layer epitaxy
Atomic properties
Cobalt oxides
Crystal structure
Crystallinity
Electrical properties
Fabrication
Morphology
Optical properties
p-type metal oxides
P-type semiconductors
Photovoltaic cells
Semiconductor devices
Stoichiometry
Temperature
Thin film transistors
Thin films
Zinc oxide
ZnCoxOy film
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Summary:Reported herein is the atomic layer deposition (ALD) of novel ternary ZnCoxOy films possessing p-type semiconducting behavior. The preparation comprises of optimized ZnO and Co3O4 deposition in sub-cycles using the commercially available precursors cyclopentadienylcobalt dicarbonyl (CpCo(CO)2), diethylzinc (DEZ) and ozone (O3). A systematic exploration of the film’s microstructure, crystallinity, optical properties and electrical properties was conducted and revealed an association with Zn/Co stoichiometry. The noteworthy results include the following: (1) by adjusting the sub-cycle of ZnO/ Co3O4 to 1/10, a spinel structured ZnCoxOy film was grown at 150 °C, with it exhibiting a smooth surface, good crystallinity and high purity; (2) the material transmittance and bandgap decreased as the Co element concentration increased; (3) the ZnCoxOy film is more stable than its p-type analog Co3O4 film; and (4) upon p-n diode fabrication, the ZnCoxOy film demonstrated good rectification behaviors as well as very low and stable reverse leakage in forward and reverse-biased voltages, respectively. Its application in thin film transistors and flexible or transparent semiconductor devices is highly suggested.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12193381