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. 2017 Feb 20;7:43070. doi: 10.1038/srep43070

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(a) Local I-V curve acquired by PhAFM. The insert shows the measurement geometry schematically. (b) and (c) In-plane PFM phase signal and spatially-resolved photovoltaic current distribution of the same area, respectively. The length of the scale bar is 500 nm.