Impedance spectroscopy of crystalline silicon solar cell: Observation of negative capacitance

Panigrahi, Jagannath; Vandana, .; Singh, R. P.; Batra, Neha; Gope, Jhuma; Sharma, Mukul; Prathap, P.; Srivastava, Sanjay K.; Rauthan, C. M. S.; Singh, Prashant

doi:10.1016/j.solener.2016.06.041

Cited by 33 publications

(13 citation statements)

References 29 publications

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“…The data from Table 3 regarding the solar cell capacitance are plotted as shown in Figure 7. From the curves, one can observe that the capacitance of the solar cell increases with the level of the irradiance, and decreases very slowly with the frequency in the used range, as it was also obtained in [27][28][29][30]33]. The data from Table 3 regarding the solar cell capacitance are plotted as shown in Figure 7.…”

Section: Resultsmentioning

confidence: 66%

“…Increasing the number of the interconnected ribbon disconnections increases the series resistance, slightly decreases the parallel resistance, and does not affect the capacitance of the PV modules.The solar cell capacitance is a combination of two capacitances: transition capacitance (also known as junction capacitance) and diffusion capacitance connected in parallel. The solar cell capacitance varies function of the cell voltage, level of irradiance, frequency, and temperature [26][27][28][29][30][31][32][33]. The capacitance variation of the silicon solar cell function of the bias voltage presents two regions: in the first region, stretching from reverse to forward bias until the knee voltage, the capacitance presents a small increasing slope (region associated with the transition capacitance), while in the second region, beginning above the knee voltage, the capacitance presents an exponential increase (in the region associated with the diffusion capacitance).…”

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confidence: 99%

“…The capacitance variation of the silicon solar cell function of the bias voltage presents two regions: in the first region, stretching from reverse to forward bias until the knee voltage, the capacitance presents a small increasing slope (region associated with the transition capacitance), while in the second region, beginning above the knee voltage, the capacitance presents an exponential increase (in the region associated with the diffusion capacitance). The increasing of the irradiance level leads to an increase of the solar cell capacitance [18,30,33]. Increasing the solar cell temperature also increases its capacitance [18,[31][32][33].…”

mentioning

confidence: 99%

“…The increasing of the irradiance level leads to an increase of the solar cell capacitance [18,30,33]. Increasing the solar cell temperature also increases its capacitance [18,[31][32][33]. Based on the dependence of the solar cell capacitance on the temperature, Anantha Krishna et al [31] proposed a method for measuring the solar cell blanket in spacecraft.This paper describes a simple method which allows determining the capacitance of the solar cells.…”

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confidence: 99%

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Solar Cell Capacitance Determination Based on an RLC Resonant Circuit

Cotfas

Borza

et al. 2018

Energies

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The capacitance is one of the key dynamic parameters of solar cells, which can provide essential information regarding the quality and health state of the cell. However, the measurement of this parameter is not a trivial task, as it typically requires high accuracy instruments using, e.g., electrical impedance spectroscopy (IS). This paper introduces a simple and effective method to determine the electric capacitance of the solar cells. An RLC (Resistor Inductance Capacitor) circuit is formed by using an inductor as a load for the solar cell. The capacitance of the solar cell is found by measuring the frequency of the damped oscillation that occurs at the moment of connecting the inductor to the solar cell. The study is performed through simulation based on National Instruments (NI) Multisim application as SPICE simulation software and through experimental capacitance measurements of a monocrystalline silicon commercial solar cell and a photovoltaic panel using the proposed method. The results were validated using impedance spectroscopy. The differences between the capacitance values obtained by the two methods are of 1% for the solar cells and of 9.6% for the PV panel. The irradiance level effect upon the solar cell capacitance was studied obtaining an increase in the capacitance in function of the irradiance. By connecting different inductors to the solar cell, the frequency effect upon the solar cell capacitance was studied noticing a very small decrease in the capacitance with the frequency. Additionally, the temperature effect over the solar cell capacitance was studied achieving an increase in capacitance with temperature.Energies 2018, 11, 672 2 of 13 be determined by using the fitting method (like the series and parallel resistance and the capacitance in the case of solar cells). The IS method has the advantage of offering the information about three important dynamic parameters and can be implemented with dedicated instruments or LCR meters. The disadvantage of this method is the need for an external signal injection into the DUT which can increase the price of the used instruments, especially if the tests are conducted under light conditions. These conditions involve DC power electronics in the instruments in order to bias the PV.Other methods are based on the time response of the PV modules. These methods are based on the transient effect of the Resistor Capacitor (RC) circuit (discharging effect of the PV capacitance [19,20] or time constant of the PV circuit [21]). The reported time response-based methods require external signal injection into the DUT and are used only in dark conditions.The dynamic parameters can be used as tools to characterize and diagnose the quality and the degradation status of the PV modules. One of the key dynamic parameters is the electrical capacitance of the PV modules. Oprea et al. [22] found that the PV panel capacitance and parallel resistance are affected by the PV panel degradation state when the potential-induced degradation was studied. Bhat et al. [23] found that t...

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Section: Resultsmentioning

confidence: 66%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Solar Cell Capacitance Determination Based on an RLC Resonant Circuit

Cotfas

Borza

et al. 2018

Energies

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“…In the electrical equivalent circuit of a solar cell under AC, the solar cell has an internal parallel capacitor. The capacitor is an open circuit for DC, but it has a reactance value that varies with the frequency in the AC [19][20][21][22][23][24][25][26][27][28][29]. This paper proposes a method for detecting the disconnection failure and failure position of a PV system using these characteristics of the solar cell.…”

Section: Introductionmentioning

confidence: 99%

Localization of Disconnection Faults in PV Installations Using the Multiple Frequencies Injection Method

Kim

2021

Energies

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This paper proposes a method to detect disconnection faults and their exact location in PV systems. The proposed method injects multiple frequencies into a PV system with a transmitter and detects the injected signal using a receiver. The signal detected by the receiver exhibits different frequency characteristics on a disconnection failure. Based on this characteristic, a disconnection failure can be detected. In addition, by detecting the frequency radiated through the disconnection point, the exact disconnection point can be detected.

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