Where, ,, ,, ,, and are the photocurrent, the saturation current of the diode, the series resistance, the shunt resistance, the electron charge, the ideality factor, the Boltzmann constant, and the temperature, respectively. At a given illumination, the current/voltage relationship is given by ( 1) from the Shockley equation. One model for analyzing solar cell work is the single-diode model shown in Figure 1. The analysis model of the solar cell from I-V characterization is with or without illumination. One model for solar cell analysis is proposed based on the Shockley diode model. The solar cell optimization could also be optimized for analysis and modeling. So far, the developing solar cell efficiency has been performed by improving the materials, construction, contact systems, and characterizations. Solar cell performance is continuously studied to raise conversion efficiency and capacity. Solar cells have continued to evolve from single crystal silicon, thin film, organic solar cell, dye-sensitized solar cell (DSSC), and perovskite solar cell (PSC). The solar cell is a device for green and clean electric power generation from solar energy. Technically, solar energy can be converted into electric energy with a solar cell. Therefore, developing electric energy from other natural resources which is eco-friendly is urgently required, such as the development of electric energy from solar energy. About 87% of the world’s energy consumption comes from fossils (oil, natural gas, and coal) which are a natural resource that cannot be renewed and lead to negative impact on the environment. Rapid growth in science, technology, and industry has increased electric energy needs. We have successfully obtained a better result of nonlinear Shockley fitting compared to the manual linear fit. In the case of the Shockley equation fit, the iteration was performed several times to obtain the least possible inferred parameters. The fittings were performed using the nonlinear equation of Shockley by determining some initial values of fittings such as R s, R sh, n, I 0, I ph, and T. The single I-V curve under the lighting was inferred to obtain the intrinsic parameters of the solar cells’ performance. We report a comparison between manual or graphical fit and fit using Shockley’s equation. Although the accuracy of the obtained values is acceptable, other problems may arise regarding the number of parameters which could be obtained. One simple method is using linear graphical fit at zero current or voltage conditions. Some of the technical problems that appear are obtaining solar cell parameters from I-V curve measurement data.
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