Additionally, the grain size increases with increasing Bi content up to BFO_15 followed by a decreasing trend observed with further increasing x , which indicates that the excess bismuth has a major effect on film morphology.
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Understanding the impact of Bi stoichiometry towards optimised BiFeO<sub>3</sub> photocathodes: structure, morphology, defects and ferroelectricity.
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The sentences
In general, the photocurrent follows an increasing trend with more bismuth present in the films until BFO_20.