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Modeling the edge effect for measuring the performance of mesoscopic solar cells with shading masks

Abstract

Perovskite solar cells (PSCs) have attracted intensive attention in the past several years due to the ever-increasing efficiency. Particularly, the high efficiencies are usually obtained by small-area (≤0.1 cm2) lab cells, and thus, the cell performance can easily be over- or underestimated due to inappropriate measurement protocols. Shading masks with well-defined apertures are usually employed to determine the test area of the cells. However, it is found that the aperture area significantly influences the measured photovoltaic parameters of the cells, which has not been quantified. Here we measure and compare the parameters of printable mesoscopic PSCs with shading masks of different shapes and aperture area. It is identified that extra diffuse light may go through the masks due to edge effect, and cause an overestimate of the photocurrent density (JSC). We establish a model to calibrate the measured JSC, which is considered as a sum of effective JSC (JSC¬-eff) and error JSC (JSC-err). By fitting the JSC measured using aperture of 0.031 ~ 0.503 cm2 with a quadratic function, JSC¬-eff and JSC-err are respectively obtained. Besides the aperture areas, the ratio of aperture area/active area also influences the open-circuit voltage and fill factor of the cells. By fitting the measured values with different apertures, we establish a model to calibrate the measured parameters of PSCs. This model can evaluate the test errors and provide effective values of the photovoltaic parameters of PSCs.

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Supplementary files

Publication details

The article was received on 06 Mar 2019, accepted on 08 Apr 2019 and first published on 09 Apr 2019


Article type: Communication
DOI: 10.1039/C9TA02459J
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Modeling the edge effect for measuring the performance of mesoscopic solar cells with shading masks

    C. Tong, W. Ji, D. Li, A. Mei, Y. Hu, Y. Rong and H. Han, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA02459J

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