Novel black bismuth oxide (Bi2O3) with enhanced photocurrent generation, produced by high-pressure torsion straining. (October 2020)

• Record Type: Journal Article
• Authors: Fujita, Ikuro; Edalati, Parisa; Wang, Qing; Watanabe, Motonori; Arita, Makoto; Munetoh, Shinji; Ishihara, Tatsumi; Edalati, Kaveh
• Is Part Of: Scripta materialia. Number 187(2020)
• Page Start: 366
• Page End: 370
• Publication Date: 2020-10
• Subjects: Severe plastic deformation (SPD) -- Photovoltaics -- Photoconductivity -- Optical properties -- Nanostructured photocatalysts; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.06.052
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : Bismuth oxide (Bi2 O3 ), a yellow semiconductor ceramic, is considered as an advanced photoactive energy material, but its activity still needs further improvement for practical applications. In this study, black Bi2 O3 with nanocrystalline structure and large fraction of oxygen vacancies is synthesized by mechanical straining via the high-pressure torsion (HPT) method. The black oxide exhibits enhanced light absorbance under both UV and visible lights. It shows a bipolar photocurrent behavior with up to six times higher photocurrent density compared with the unprocessed yellow Bi2 O3 . This study shows the high potential of severely-strained black Bi2 O3 for photovoltaic, photoconductivity and photocatalytic applications. Graphical abstract: Image, graphical abstract