Issue 28, 2021

Carrier extraction from metallic perovskite oxide nanoparticles


We observe the extraction of carriers excited between two types of bands in the perovskite oxide, Sr-deficient strontium niobate (Sr0.9NbO3). Sr0.9NbO3 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 Sr0.9NbO3 nanoparticles. These findings open up great opportunities to harvest a very broad solar spectral absorption range with reduced recombination losses.

Graphical abstract: Carrier extraction from metallic perovskite oxide nanoparticles

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Article information

Article type
06 May 2021
14 Jun 2021
First published
09 Jul 2021
This article is Open Access
Creative Commons BY license

Nanoscale, 2021,13, 12271-12278

Carrier extraction from metallic perovskite oxide nanoparticles

C. McDonald, C. Ni, V. Švrček, M. Macias-Montero, T. Velusamy, P. A. Connor, P. Maguire, J. T. S. Irvine and D. Mariotti, Nanoscale, 2021, 13, 12271 DOI: 10.1039/D1NR02890A

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