21 The p–n heterojunction structures were proven faster transmission of photogenerated holes, which is quite significant to improve the photocatalytic activity by facilitating electron–hole separation. 21–27 Thus, several researchers reported various p–n heterojunction photocatalysts such as α-Fe 2 O 3 /Cu 2 O, 6 Ag 2 O/Bi 2 O 2 CO 3 , 28 Ag 3 PO 4 /WO 3 , 29 Fe 3 O 4 /Bi 2 O 2 CO 3 , 30 TiO 2 /NiO, 27 WO 3 /Ag 2 CO 3 , 31 and WO 3 /BiOI. 32 Irrespective of the strategy that was implemented to improve the photocatalytic activity, most of these studies are powder-based photocatalytic materials.
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Fabrication of Ag<sub>2</sub>O/WO<sub>3</sub> p-n heterojunction composite thin films by magnetron sputtering for visible light photocatalysis.
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