Fig. 4
From: Strain-gradient mediated local conduction in strained bismuth ferrite films
Flexo-photovoltaic effect and light polarization resolved photocurrent mapping. a Schematic showing the electronic process happening at the morphotropic phase boundary. The abbreviation FPV refers the flexo-photovoltaic effect. The number of the red dots denotes the resultant density of nonequilibrium carriers that determines the local photoconduction. b Schematic showing the illumination geometry. c Light polarization dependent photoconduction ratio between R- and \(T\prime\)-phases. The solid curve is the fit of the experimental data with Eq. 1. Inset of (b) shows an example of photocurrent mapping with light polarization angle of 150° (left) and its corresponding topography (right). The error bars indicate the standard deviations of photo-conductance ratio between morphotropic phases mapped in a 2 × 0.4 μm2 area
