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Carrier extraction from metallic perovskite oxide nanoparticles.

Carrier extraction from metallic perovskite oxide nanoparticles.

Authors :
McDonald C
Ni C
Švrček V
Macias-Montero M
Velusamy T
Connor PA
Maguire P
Irvine JTS
Mariotti D
Source :
Nanoscale [Nanoscale] 2021 Jul 28; Vol. 13 (28), pp. 12271-12278. Date of Electronic Publication: 2021 Jul 09.
Publication Year :
2021

Abstract

We observe the extraction of carriers excited between two types of bands in the perovskite oxide, Sr-deficient strontium niobate (Sr <subscript>0.9</subscript> NbO <subscript>3</subscript> ). Sr <subscript>0.9</subscript> NbO <subscript>3</subscript> exhibits metallic behaviour and high conductivity, whilst also displaying broad absorption across the ultraviolet, visible, and near-infrared spectral regions, making it an attractive material for solar energy conversion. Furthermore, the optoelectronic properties of strontium niobate can easily be tuned by varying the Sr fraction or through doping. Sr-deficient strontium niobate exhibits a split conduction band, which enables two types of optical transitions: intraband and interband. However, whether such carriers can be extracted from an unusual material as such remains unproven. In this report, we have overcome the immense challenge of photocarrier extraction by fabricating an extremely thin absorber layer of Sr <subscript>0.9</subscript> NbO <subscript>3</subscript> nanoparticles. These findings open up great opportunities to harvest a very broad solar spectral absorption range with reduced recombination losses.

Details

Language :
English
ISSN :
2040-3372
Volume :
13
Issue :
28
Database :
MEDLINE
Journal :
Nanoscale
Publication Type :
Academic Journal
Accession number :
34241608
Full Text :
https://doi.org/10.1039/d1nr02890a