期刊
SMALL
卷 13, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201702177
关键词
CdMoO4 microplates; hot electron injection effect; responsivity; UV photodetectors; ZnO films
类别
资金
- National Natural Science Foundation of China [11674061, 51471051]
- Science and Technology Commission of Shanghai Municipality [15520720700]
- Shanghai Shu Guang Project [12SG01]
- Programs for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
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 approximate to 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.
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