Abstract
We studied the influence of different mask apertures on the open-circuit voltage measurement of perovskite solar cells. Aperture masks with different sizes were equipped to control the proportion of dark-state region. Statistical results of photovoltaic parameters, ideality factor, and reverse saturation current density revealed that different mask apertures would affect the J-V measurement results, especially the open-circuit voltage. A double diode model simulation together with the impedance spectroscopy and transient photovoltage decay measurement has been further employed to analyze the reasons and found that the mask with inappropriate shading, which is smaller than the cells active area, will introduce excess charge transfer and recombination pathways, thus lead to an underestimate of open-circuit voltage. This work provides a promising route towards a more accurate J-V measurement of perovskite solar cells.
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