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. 2017 Apr 11;7:46478. doi: 10.1038/srep46478

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(A) Top-view and (B) Cross-sectional view SEM images of rGO/pyramidal Si solar cell. (C) SEM image of rGO on planar Si. (D) Photograph of the rGO/pyramidal Si heterojunction solar cell with top Ag electrode. The width and length of solar cell is 5 mm and 7 mm, respectively.