Understanding equivalent circuits in perovskite solar cells. Insights from drift-diffusion simulation

Riquelme, Antonio J.; Valadez-Villalobos, Karen; Boix, Pablo P.; Oskam, Gerko; Mora‐Seró, Iván; Anta, Juan A.

doi:10.1039/d2cp01338j

Cited by 38 publications

(48 citation statements)

References 54 publications

(117 reference statements)

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“…It is a central technique for the characterization of PV cells and electrochemical devices. , The knowledge about the system properties is represented by an equivalent circuit (EC), in which elements change according to external conditions. Extensive studies of IS of MHP − have provided a basic picture of the shape of spectra and EC models. These results show that the IS description of an MHP measured over a broad voltage range undergoes transformations in which some elements appear and dominate the impedance spectra while others lose relevance.…”

Section: Introductionmentioning

confidence: 99%

Transition from Capacitive to Inductive Hysteresis: A Neuron-Style Model to Correlate I–V Curves to Impedances of Metal Halide Perovskites

2022

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Metal halide perovskite (MHP) devices often show different types of hysteresis in separate voltage domains. At low voltage, the impedance response is capacitive, and the cell gives regular hysteresis. At high voltage, the hysteresis is inverted, corresponding to an inductive response that causes a negative capacitance feature. We calculate the hysteresis current due to a chemical inductor model, and we show that the current is inversely proportional to the voltage scan rate. We formulate a general dynamical model for the solar cell response in the style of neuronal models for the action potential, based on a few differential equations. The model allows us to track the transition from capacitive to inductive properties, both by impedance spectroscopy and current−voltage measurements at different voltage sweep rates. We obtain a correlation of the time constants for the capacitor and the inductor. We interpret the origin of the low-frequency features in terms of ion-controlled surface recombination. This explains the strong correlation of the low-frequency capacitance and inductor, as both originate from the same mechanism. The methodology derived in this paper provides great control over the dynamic properties of metal halide perovskite solar cells, even in cases in which there are qualitative changes of the solar cell current−voltage response over a broad voltage range.

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Section: Introductionmentioning

confidence: 99%

Transition from Capacitive to Inductive Hysteresis: A Neuron-Style Model to Correlate I–V Curves to Impedances of Metal Halide Perovskites

2022

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“…Furthermore, to study the interfacial charge carrier transfer kinetics, electrochemical impedance spectroscopy (EIS) measurement is performed under dark conditions to avoid too much deviation of the impedance value measured under illumination. Figure 4d displays the Nyquist plot and equivalent circuit model (ECM), which consists of two elements (including a resistor and a capacitor in parallel) 48 Much of the literature reports extensions to this model to account for additional features sometimes observed in the EIS of PSCs. 49,50 However, increasing the complexity of the equivalent circuit does not provide insight into the origin of these phenomena.…”

mentioning

confidence: 99%

“…R C and C C are transfer resistance and capacitance, respectively, representing the resistance and capacitance that generate high-frequency signals. R rec and C rec are recombination resistance and capacitance, corresponding to low-frequency arcs . Much of the literature reports extensions to this model to account for additional features sometimes observed in the EIS of PSCs. , However, increasing the complexity of the equivalent circuit does not provide insight into the origin of these phenomena.…”

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confidence: 99%

Potassium Salt Coordination Induced Ion Migration Inhibition and Defect Passivation for High-Efficiency Perovskite Solar Cells

Wang

Zou

Ouyang

et al. 2022

J. Phys. Chem. Lett.

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The disordered distribution of trap states and ion migration limit the commercial application of perovskite solar cells (PSCs). Herein, we apply an oxamic acid potassium salt (OAPS) as a bifunctional additive of perovskite film. The Lewis base group C=O of OAPS can interact with the uncoordinated Pb2+ caused by the I site substitution by Pb and the dangling bonds of the perovskite, which is beneficial to reduce the nonradiative recombination loss. In addition, the countercation K+ of OAPS is confirmed to occupy the perovskite lattice interstitial sites and result in lattice expansion, inhibiting the formation of iodide Frenkel defects and I– ion migration. As a result, the synergistic effect achieves enhanced power conversion efficiency (PCE) from 19.98 to 23.02%, with a fill factor reaching up to 81.90% and suppressed current–voltage hysteresis. The device also presents improved stability, maintaining 93% of the initial PCE after 2000 h of storage.

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“…The impedance of PSC is strongly affected by ion motion mostly in the low frequency range. 40 To analyze the impedance pattern, we used the equivalent circuit formalism fitting the experimental results with the equivalent circuit plotted in Figure 6b. This circuit is one of the most extended models and provides results that can be correlated with other models including the circuit with elements arranged in series 35,40 or as an alternative model to a circuit using transistors.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…40 To analyze the impedance pattern, we used the equivalent circuit formalism fitting the experimental results with the equivalent circuit plotted in Figure 6b. This circuit is one of the most extended models and provides results that can be correlated with other models including the circuit with elements arranged in series 35,40 or as an alternative model to a circuit using transistors. 42 In this circuit, R s stands for the series resistance, and it is related to the FTO and the resistance of the wire connections.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Degradation Analysis of Triple-Cation Perovskite Solar Cells by Electrochemical Impedance Spectroscopy

Torres

Zarazúa

Esparza

et al. 2022

ACS Appl. Energy Mater.

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In this work, the electrical properties of different triple-cation compositions with the formula Cs0.05FA1–X MA X Pb(I1–X Br X )3 have been analyzed using electrochemical impedance spectroscopy. The perovskite solar cells were subjected to ambient conditions to compare their results in terms of ambient degradation. Their morphology, optical properties, and photovoltaic performance were characterized. We analyzed the causes and effects of ambient degradation mechanisms on the devices. Electrochemical processes such as ion movement, a combination of radiative recombination and nonradiative recombination, and charge transport were detected. The MA percentage decrease in the composition of triple-cation perovskites, APbX3 produces an improvement in the stability and durability of perovskite solar cells. This enhancement is due to the reduction of the amount of ion vacancies helping to reduce the degradation in the device by avoiding the accumulation of defects.

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Understanding equivalent circuits in perovskite solar cells. Insights from drift-diffusion simulation

Abstract: Perovskite solar cells (PSCs) have reached impressively high efficiencies in a short period of time; however, the optoelectronic properties of halide perovskites are surprisingly complex owing to the coupled ionic...

Cited by 38 publications

References 54 publications

Transition from Capacitive to Inductive Hysteresis: A Neuron-Style Model to Correlate I–V Curves to Impedances of Metal Halide Perovskites

Transition from Capacitive to Inductive Hysteresis: A Neuron-Style Model to Correlate I–V Curves to Impedances of Metal Halide Perovskites

Potassium Salt Coordination Induced Ion Migration Inhibition and Defect Passivation for High-Efficiency Perovskite Solar Cells

Degradation Analysis of Triple-Cation Perovskite Solar Cells by Electrochemical Impedance Spectroscopy

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