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Figure 3: (a) Optical microscopic image of integrated high-voltage solar module. Each single solar cell is connected by serially interconnecting with the gold electrode. (b) Expanded optical microscopic image of interconnected single a-Si solar cell. (c) Current-voltage curve with respect to the number of interconnected microcells (80 cells and 120 cells). (d) Output power and the operation voltage with different numbers of interconnected microcells (single cell, 80 cells, and 120 cells).