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. 2014 Apr 23;4:4756. doi: 10.1038/srep04756

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(a) The current-voltage characteristics of photovoltaic devices made of mesoscopic NiO_nc/perovskite/PCBM hetrojunction solar cell (red line for PC₇₁BM and blue line for PC₆₁BM) and planar NiO_x/perovskite/PC₆₁BM heterojunction solar cells (green line). (b) The IPCE of mesoscopic NiO_nc/perovskite/PC₇₁BM device (red line), mesoscopic NiO/perovskite/PC₆₁BM device (blue line) and planar NiO_x/perovskite/PC₆₁BM heterojunction solar cell (green line). (C) The light harvesting efficiency (LHE) and absorbance of mesoscopic NiO_nc/perovskite film (blue dot and blue line), and planar NiO_x/perovskite film (green dot and green line).