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Optimizing the Photovoltaic Performance of Organic Solar Cells for Indoor Light Harvesting.

Organic solar cells (OSCs) harvesting indoor light are highly promising for emerging technologies, such as Internet of Things. Here, the photovoltaic performance of the PTB7-Th:PC 71 BM solar cells, constructed using "optimized" and "non-optimized" processing conditions, are compared for indoor and outdoor applications. We find that compared to the "optimized" solar cell, the "non-optimized" solar cell is less efficient under simulated solar light illumination (100 mW cm -2 , spectral range 350-1100 nm), due to the significant bimolecular charge carrier recombination losses. However, under simulated indoor illumination (3.28 mW cm -2 , spectral range 400-700 nm), bimolecular recombination is effective suppressed, thus the power conversion efficiency of the "non-optimized" solar cell was increased to 14.7%, higher than that of the "optimized" solar cell (14.2%). These results suggest that the "common" strategy used to optimize the OSCs could be undesired for indoor OSCs. Then, we demonstrate that the difficulty in realizing the desired "morphology" of the active layer for the outdoor OSCs, could be eased for the indoor OSCs, allowing us to realize high-efficiency indoor OSCs using a non-halogenated solvent.