Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.112
Publication date: 20th April 2022
The appearance of kinks in the fourth quadrant of I-V characteristics decreases dramatically the efficiency of photovoltaic solar cells [1]. These S-shaped I-V curves have been successfully reproduced using different lumped-parameter equivalent circuits, composed of two or more diodes. On the other hand, Mazhari’s model has been successfully used to reproduce S-shaped I-V curves of different types of solar cells [2]. In this work, Mazhari’s lumped-parameter equivalent circuit is used to model the S-shaped I-V curves of perovskite solar cells numerically simulated with Silvaco ATLAS TCAD. The simulated solar cell structure is FTO/TiO2/MAPbI3/Spiro-OMeTAD/Au and, in order to replicate I-V curves with a kink, perovskite carrier mobility and defect density have been varied between 0.05 and 0.25 cm2/(Vs) and from 1·1014 up to 1·1015 cm-3 respectively. For each device, I-V curves have been simulated for different AM1.5 irradiation levels, from dark conditions up to 2 suns. The dark diode parameters of Mazhari’s circuit, I0dark, and ηdark, have been obtained by fitting the dark I-V curve. The other model parameters, I0rec, ηrec Iext, ηext, have been obtained by fitting Mazhari’s circuit to the I-V characteristics under illumination. This fitting process has been performed for each device. Results show that Mazhari’s circuit successfully reproduces the Silvaco numerically simulated S-shaped I-V curves, when S-shape is caused by a low value of the perovskite carrier mobility or by a high value of the defect density. The dependence of the Mazhari’s circuit parameters on the perovskite carrier mobility and on the defect density will also be discussed.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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