Hexagonal YMnO3 films as promising ultraviolet photodetectors. Issue 3 (15th February 2019)

• Record Type: Journal Article
• Authors: Yang, S.B.; Wang, C.A.; Li, Y.; Chen, Y.; Zhang, A.H.; Zeng, M.; Fan, Z.; Gao, X.S.; Lu, X.B.; Liu, J.-M.
• Is Part Of: Ceramics international. Volume 45:Issue 3(2019)
• Page Start: 3239
• Page End: 3243
• Publication Date: 2019-02-15
• Subjects: Hexagonal YMnO3 -- UV photodetector -- Photoresponse -- Multiferroicity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.10.227
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Hexagonal rare-earth manganites (h- R MnO3, R = Sc, Y, Ho-Lu) exhibit intricate multiferroic properties and may be utilized for various technological applications ranging from non-volatile memories to solar cells and photo-detectors. Here, we report the epitaxial growth of hexagonal YMnO3 (h-YMO) films with different thicknesses deposited on yttria-stabilized zirconia (YSZ) substrates and their photoresponses to ultraviolet (UV) light. The structural characterizations illustrate that all the films present high quality epitaxy with out-of-plane h-YMO(0001)//YSZ(111) and in-plane h-YMO[123 0]//YSZ[110] relationship. Meanwhile, UV light driven photoresponses of these as-prepared films based on the planar photodetector structure with transparent Al-doped ZnO (AZO) as top electrodes are explored. It is revealed that the photocurrent will first increase and then decrease with increasing film thickness. The highest photoconductivity gain is ~387.4 observed at +4 V bias for the device with 160 nm YMO film. These results provide a guideline for hexagonal rare-earth manganites to work for UV photodetector application.