Large negative photoresistivity in amorphous NdNiO.sub.3./sub. film

0552096 - FZÚ 2022 RIV CH eng J - Journal Article
Stupakov, Alexandr - Kocourek, Tomáš - Nepomniashchaia, Natalia - Tyunina, Marina - Dejneka, Alexandr
Large negative photoresistivity in amorphous NdNiO₃ film.
Coatings. Roč. 11, č. 11 (2021), č. článku 1411. E-ISSN 2079-6412
R&D Projects: GA ČR(CZ) GA20-21864S
Institutional support: RVO:68378271
Keywords : rare-earth nickelates * epitaxial perovskite films * amorphous thin films * photoconductivity
OECD category: Coating and films
Impact factor: 3.236, year: 2021
Method of publishing: Open access

A significant decrease in resistivity by 55% under blue lighting with ~0.4 Jmm-2 energy density is demonstrated in amorphous film of metal-insulator NdNiO3 at room temperature. This large negative photoresistivity contrasts with a small positive photoresistivity of 8% in epitaxial NdNiO3 film under the same illumination conditions. The magnitude of the photoresistivity rises with the increasing power density or decreasing wavelength of light. By combining the analysis of the observed photoresistive effect with optical absorption and the resistivity of the films as a function of temperature, it is shown that photo-stimulated heating determines the photoresistivity in both types of films. Because amorphous films can be easily grown on a wide range of substrates, the demonstrated large photo(thermo)resistivity in such films is attractive for potential applications, e.g., thermal photodetectors and thermistors.
Permanent Link: http://hdl.handle.net/11104/0327249