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Schematic of photovoltaic architectures and flat-band diagrams at VOC of a CQD-sensitized solar cell, b Schottky junction solar cell, and c heterojunction solar cell (reprinted with permission from ref. [13], Copyright 2010 American Chemical Society). d Schematic of CQD homojunction solar cell, energy band diagram, and cross-sectional image of scanning electron microscope image (reprinted with permission from ref. [19], Copyright 2012 American Chemical Society)
