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(a) Structure-, (b) precursor-, and (c) dye-dependent minimum, maximum, and average efficiencies of the ZnO-based DSSCs. Comparison of the number of data points (bubble size) and average efficiencies of the ZnO-based DSSCs at different years based on the (d) structures, (e) precursors, and (f) dyes. The number of experimental observations is shown at the center of each bubble.
