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5 years ago

ZnO Film UV Photodetector with Enhanced Performance: Heterojunction with CdMoO4 Microplates and the Hot Electron Injection Effect of Au Nanoparticles

ZnO Film UV Photodetector with Enhanced Performance: Heterojunction with CdMoO4 Microplates and the Hot Electron Injection Effect of Au Nanoparticles
Mingming Jiang, Weixin Ouyang, Xiaosheng Fang, Feng Teng
A novel CdMoO4–ZnO composite film is prepared by spin-coating CdMoO4 microplates on ZnO film and is constructed as a heterojunction photodetector (PD). With an optimized loading amount of CdMoO4 microplates, this composite film PD achieves a ≈18-fold higher responsivity than pure ZnO film PD at 5 V bias under 350 nm (0.15 mW cm−2) UV light illumination, and its decay time shortens to half of the original value. Furthermore, Au nanoparticles are then deposited to modify the CdMoO4–ZnO composite film, and the as-constructed photodetector with an optimized deposition time of Au nanoparticles yields an approximately two-fold higher photocurrent under the same condition, and the decay time reduces by half. The introduced CdMoO4 microplates form type-II heterojunctions with ZnO film and improve the photoelectric performance. The hot electrons from Au nanoparticles are injected into the CdMoO4–ZnO composite film, leading to the increased photocurrent. When the light is off, the Schottky barriers formed between Au nanoparticles and CdMoO4–ZnO composite film block the carrier transportation and accelerate the decay process of current. The study on Au-nanoparticle-modified CdMoO4–ZnO composite film provides a facile method to construct ZnO film based PD with novel structure and high photoelectric performance. Au nanoparticle modified CdMoO4–ZnO heterojunction UV photodetector with high performance is fabricated. A heterojunction formed between a ZnO film and CdMoO4 microplates, the hot electron injection effect of Au nanoparticles, and the Schottky barriers formed between Au nanoparticles and semiconductors cause the stepwise improvements of the photoelectronic performance of the heterojunction photodetectors.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201702177

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