期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 43, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201803142
关键词
core-shell; CuCrO2; p-n junction; self-powered UV photodetector; ZnO nanowire
类别
资金
- French Research National Agency through the project DOSETTE [ANR-17-CE24-0003]
- Carnot Institute Energies du Futur through the project ECOLED
- IDS-FunMat scholarship selected under the programme ERASMUS MUNDUS II 2009-2013
- Centre of Excellence of Multifunctional Architectured Materials CEMAM - Investments for the Future Program [ANR-10-LABX-44-01]
- French RENATECH network through the CIME-Nanotech
- PTA technological platforms in a cleanroom environment
- Magdalene College, Cambridge
- EPSRC [EP/M024873/1]
- H2020 Marie Sklodowska-Curie Actions [641640]
- Marie Curie Actions (FP7/2007-2013) [631111]
An original self-powered UV photodetector integrating ZnO/CuCrO2 core-shell nanowire heterostructures is fabricated using low-cost and scalable chemical deposition techniques operating at moderate temperatures. A 35 nm thick delafossite phase CuCrO2 shell is formed with high uniformity by aerosol-assisted chemical vapor deposition over an array of vertically aligned ZnO nanowires grown by chemical bath deposition. The CuCrO2 shell consists of columnar grains at the top of ZnO nanowires as well as nanograins with some preferential orientations on their vertical sidewalls. The ZnO/CuCrO2 core-shell nanowire heterostructures exhibit significant diode behavior, with a rectification ratio approaching 1.2 x 10(4) at 1 V and -1 V, as well as a high optical absorptance above 85% in the UV part of the electromagnetic spectrum. A high UV responsivity at zero bias under low-power illumination of up to 3.43 mA W-1 under a 365 nm UV lamp, and up to 5.87 mA W-1 at 395 nm from spectrally resolved measurements, alongside a high selectivity with a UV-to-visible (395-550 nm) rejection ratio of 106 is measured. The short rise and decay times of 32 and 35 mu s, respectively, both measured at zero bias, further establish these devices as promising candidates for cost-efficient, all-oxide self-powered UV photodetectors.
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