Lumped-Parameter Equivalent Circuit Model for S-Shaped Current–Voltage Characteristics of Organic Solar Cells

Yu, Fangyong; Huang, Gongyi; Lin, Wei; Xu, Chuanlong

doi:10.1109/ted.2018.2878465

Cited by 13 publications

(9 citation statements)

References 30 publications

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“…The FF decreases in the cases of those SHJ cells with high carbon-content a-SiC2 and a-SiC3. The series resistance of the SHJ cells can be extracted from the J-V curves by several methods [30][31][32]. Chang et al [33] reported a simple solar cell parameter extraction method from a single J-V curve.…”

Section: Resultsmentioning

confidence: 99%

Silicon Heterojunction Solar Cells with p-Type Silicon Carbon Window Layer

et al. 2019

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Boron-doped hydrogenated amorphous silicon carbide (a-SiC:H) thin films are deposited using high frequency 27.12 MHz plasma enhanced chemical vapor deposition system as a window layer of silicon heterojunction (SHJ) solar cells. The CH4 gas flow rate is varied to deposit various a-SiC:H films, and the optical and electrical properties are investigated. The experimental results show that at the CH4 flow rate of 40 sccm the a-SiC:H has a high band gap of 2.1 eV and reduced absorption coefficients in the whole wavelength region, but the electrical conductivity deteriorates. The technology computer aided design simulation for SHJ devices reveal the band discontinuity at i/p interface when the a-SiC:H films are used. For fabricated SHJ solar cell performance, the highest conversion efficiency of 22.14%, which is 0.33% abs higher than that of conventional hydrogenated amorphous silicon window layer, can be obtained when the intermediate band gap (2 eV) a-SiC:H window layer is used.

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Section: Resultsmentioning

confidence: 99%

Silicon Heterojunction Solar Cells with p-Type Silicon Carbon Window Layer

et al. 2019

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“…V t is the thermal voltage symbolled by kT/q, where k is the Boltzmann constant, T is the absolute temperature, and q is the electron charge. To derive the solution of the equation set efficiently, we utilize NR method [17][18][19] to get the solution V int (V) of (1). Subsequently, we substitute V int (V) into (2) to obtain the results of I(V).…”

Section: Theoretical Analysismentioning

confidence: 99%

“…In fact, as early as 2006, B. Mazhari proposed a three-diode circuit model [15] including seven fitting parameters. This circuit drew a lot of attention [16][17][18][19][20] because of its simpleness. Analytical solutions, in some special cases of Mazhari's circuit, are derived in [16].…”

Section: Introductionmentioning

confidence: 99%

“…Of course, we know that solutions in special cases limited the applications of Mazhari's circuit. In addition, our previous works [17][18][19] showed that Mazhari's model is unable to demonstrate the linear-like current kink characteristics of OSCs in the third quadrant due to the absence of resistance, and added a shunt resistance with recombination [17] or dark [19] diode to improve the simulation accuracy of Mazhari's circuit in the third quadrant. However, further improvements are required to accurately predict the exponent-like rise of S-shaped kinks of OSCs on the condition that V oc is larger than zero.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we revise our previous models [17,19] by using both diode and resistor to simulate the extraction current. Subsequently, we use the Newton-Raphson (NR) method to solve lumped-parameter circuit and plot I-V curves.…”

Section: Introductionmentioning

confidence: 99%

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A Lumped-Parameter Equivalent Circuit Modeling for S-Shaped I–V Kinks of Organic Solar Cells

Wei

Lin

et al. 2019

Crystals

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We propose an improved lumped-parameter equivalent circuit model to describe S-shaped I–V kinks observed from organic solar cells. Firstly, to predict the S-shaped I–V kinks accurately in both the first and fourth quadrants, a shunt resistor in parallel with extraction diode is added to our previous model. Secondly, based on the Newton–Raphson method, we derive a solution to our improved circuit. Thirdly, our solution is verified by the method of least squares and experiments. Finally, compared with our previous work, the improved circuit has higher accuracy in demonstrating S-shaped I–V kinks in the first and fourth quadrants. Such an improved model is suitable for circuit simulations of organic solar cells.

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Development software program for extraction of photovoltaic cell equivalent circuit model parameters based on the Newton–Raphson method

2022

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Finding the equivalent circuit parameters for photovoltaic (PV) cells is crucial as they are used in the modeling and analysis of PV arrays. PV cells are made of silicon semiconductor materials. These materials have a nonlinear characteristic. This distorts the sinusoidal waveform of the current and voltage. As a result, harmonic components are formed in the solar system. The PV cell is the smallest building block of the PV system and produces voltages between 0.5V and 0.7V. It serves as a source of current in the solar system. The amount of radiation hitting the cell determines how much current it produces. In an ideal case, a diode and a parallel current source make up the equivalent circuit of the PV cell. In practice, the addition of a series and parallel resistor is made to the ideal equivalent circuit. There are many equivalent circuits in the literature on modeling the equivalent circuit of a PV cell. The PV cell single diode model is the most used model due to its ease of analysis. In this study, the iterative method by Newton-Raphson was used to nd the equivalent circuit parameters of a PV cell. This method is one of the most widely used methods for determining the roots of nonlinear equations in numerical analysis. In this study, ve unknown parameters (Iph, Io, Rs, Rsh, m) of the PV cell equivalent circuit were quickly discovered with the software program prepared based on the Newton-Raphson method in Matlab.

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Lumped-Parameter Equivalent Circuit Model for S-Shaped Current–Voltage Characteristics of Organic Solar Cells

Cited by 13 publications

References 30 publications

Silicon Heterojunction Solar Cells with p-Type Silicon Carbon Window Layer

Silicon Heterojunction Solar Cells with p-Type Silicon Carbon Window Layer

A Lumped-Parameter Equivalent Circuit Modeling for S-Shaped I–V Kinks of Organic Solar Cells

Development software program for extraction of photovoltaic cell equivalent circuit model parameters based on the Newton–Raphson method

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