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ZnO-Cu2O core-shell nanowires as stable and fast response photodetectors
Lulea Univ Technol, Div Mat Sci, Dept Engn Sci & Math, S-97187 Lulea, Sweden..
Lulea Univ Technol, Div Mat Sci, Dept Engn Sci & Math, S-97187 Lulea, Sweden..
Lulea Univ Technol, Div Mat Sci, Dept Engn Sci & Math, S-97187 Lulea, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
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2018 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 51, p. 308-316Article in journal (Refereed) Published
Abstract [en]

In this work, we present all-oxide p-n junction core-shell nanowires (NWs) as fast and stable self-powered photodetectors. Hydrothermally grown n-type ZnO NWs were conformal covered by different thicknesses (up to 420 nm) of p-type copper oxide layers through metalorganic chemical vapor deposition (MOCVD). The ZnO NWs exhibit a single crystalline Wurtzite structure, preferentially grown along the [002] direction, and energy gap E-g = 3.24 eV. Depending on the deposition temperature, the copper oxide shell exhibits either a crystalline cubic structure of pure Cu2O phase (MOCVD at 250 degrees C) or a cubic structure of Cu2O with the presence of CuO phase impurities (MOCVD at 300 degrees C), with energy gap of 2.48 eV. The electrical measurements indicate the formation of a p-n junction after the deposition of the copper oxide layer. The core-shell photodetectors present a photo-responsivity at 0 V bias voltage up to 7.7 mu A/W and time response <= 0.09 s, the fastest ever reported for oxide photodetectors in the visible range, and among the fastest including photodetectors with response limited to the UV region. The bare ZnO NWs have slow photoresponsivity, without recovery after the end of photo-stimulation. The fast time response for the core-shell structures is due to the presence of the p-n junctions, which enables fast exciton separation and charge extraction. Additionally, the suitable electronic structure of the ZnO-Cu2O heterojunction enables self-powering of the device at 0 V bias voltage. These results represent a significant advancement in the development of low-cost, high efficiency and self-powered photodetectors, highlighting the need of fine tuning the morphology, composition and electronic properties of p-n junctions to maximize device performances.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 51, p. 308-316
Keywords [en]
All-oxide NWs, Core-shell NWs, Self-powered photodetectors, Fast photodetectors, ZnO-Cu2O heterojunction
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-233270DOI: 10.1016/j.nanoen.2018.06.058ISI: 000440682100034Scopus ID: 2-s2.0-85049324019OAI: oai:DiVA.org:kth-233270DiVA, id: diva2:1240159
Funder
Knut and Alice Wallenberg Foundation, KAW 2016.0346The Kempe FoundationsEU, Horizon 2020, 654002EU, European Research CouncilVINNOVA, 2015-01513Riksbankens Jubileumsfond
Note

QC 20180820

Available from: 2018-08-20 Created: 2018-08-20 Last updated: 2018-08-20Bibliographically approved

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