Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 26, Pages 23454-23462Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b04838
Keywords
all-oxide p-n heterojunction; ZnO-Co3O4 core-shell; nanowire geometry; self-powered photodetector; photovoltaic photodetector
Funding
- Kempe Foundation
- Knut & Alice Wallenberg Foundation
- AFORSK Foundation
- European Commission [654002]
- LTU Lab fund program
Ask authors/readers for more resources
Self-powered photodetectors operating in the UV-visible-NIR window made of environmentally friendly, earth abundant, and cheap materials are appealing systems to exploit natural solar radiation without external power sources. In this study, we propose a new p-n junction nanostructure, based on a ZnO-Co3O4 core-shell nanowire (NW) system, with a suitable electronic band structure and improved light absorption, charge transport, and charge collection, to build an efficient UV-visible-NIR p-n heterojunction photodetector. Ultrathin Co3O4 films (in the range 1-15 nm) were sputter-deposited on hydrothermally grown ZnO NW arrays. The effect of a thin layer of the Al2O3 buffer layer between ZnO and Co3O4 was investigated, which may inhibit charge recombination, boosting device performance. The photoresponse of the ZnO-Al2O3-Co3O4 system at zero bias is 6 times higher compared to that of ZnO-Co3O4. The responsivity (R) and specific detectivity (D*) of the best device were 21.80 mA W-1 and 4.12 x 10(12) Jones, respectively. These results suggest a novel p-n junction structure to develop all-oxide UV-vis photodetectors based on stable, nontoxic, low-cost materials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available