Abstract
The quality performance analysis of any solar cell can only be predicted through the parameters extracted from its current-voltage characteristics. Herein, we demonstrate an efficient analytical method to calculate the series resistance of organic solar cells without any pre approximation. It has been shown that the inaccuracy in series resistance takes place due to the high ideality factor of the organic based solar cells, usually ranging from 2-5. Using a systemic approach, we solved the single diode solar cell model to determine the series resistance expression. The dependence of series resistance on ideality factor of the device and the reverse saturation current calculation through the illuminated current-voltage characteristics has been presented here for the first time. The entire method has been programmatically realized in MATLAB. The extracted parameters values have been compared to the other methods for the proof of validation and it shows good agreement where as some outputs are better resolved. Additionally, the effectiveness of the present method is also matched with NREL certified silicon solar cell (reference cell model 60623) parameter extracted from K24XX cell software provided with PET cell tester model, CT200AAA solar simulators. The present proposed method is not restricted to the organic solar cell only but it can also be applied for the other type of solar cell as well. Therefore, the proposed method shows the relevance in the present scenario of solar cell research and development.
Highlights
The high manufacturing cost of crystalline silicon and the latest advancements on semiconducting polymer strategy and synthesis in recent years have directed the attention of the scientist and engineer’s community towards organic solar cells (OSC’s).[1,2,3,4] For the estimation of organic solar cell performance and further improvement in design, fabrication, and simulation; the precise knowledge of electrical parameters from current-voltage characteristic is essential
It has been shown that the inaccuracy in the estimation of series resistance arises from the high ideality factor of organic solar cell as calculated by mathematical analysis
Other parameters are the ideality factors, saturation current, and shunt resistance can be evaluated from the present program
Summary
The implicit nature of current-voltage expression increases the difficulty in the parameter extraction To overcome this difficulty, the Jain et al proposed the Lambert W function to obtain the explicit analytical solution to study the properties of organic solar cell.[17] It applies simulated current-voltage characteristic instead of experimental data. The Jain et al proposed the Lambert W function to obtain the explicit analytical solution to study the properties of organic solar cell.[17] It applies simulated current-voltage characteristic instead of experimental data These types of vertical optimization method (minimizing the current quadratic error) allow the extraction of solar cell parameters simultaneously, but it requires good initial estimation of parameters such as series resistance, ideality factor and reverses saturation current for calculation. For the calculation of ideality factor, the slope of thesemi-logarithmic dark J-V curve should be selected in the intermediate recombination region
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