Revisiting lifetimes from transient electrical characterization of thin film solar cells; a capacitive concern evaluated for silicon, organic and perovskite devices

Kiermasch, David; Baumann, Andreas; Fischer, M.; Dyakonov, Vladimir; Tvingstedt, Kristofer

doi:10.1039/c7ee03155f

Cited by 105 publications

(153 citation statements)

References 48 publications

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“…Time and frequency domain measurements, such as TPV and EIS, are often employed to study recombination in devices, and in many cases would produce comparable results. [53][54][55] These techniques have been widely employed in DSSC research, [32][33][34]56 although not often in combination. Studies are predominately published where either the frequency or time domain characterisation techniques are favoured.…”

Section: Impedance Spectroscopy Measurementsmentioning

confidence: 99%

A combined transient photovoltage and impedance spectroscopy approach for a comprehensive study of interlayer degradation in non-fullerene acceptor organic solar cells

Pockett

Lee

et al. 2019

Nanoscale

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Organic solar cells utilise thin interlayer materials between the active layer and metal electrodes to improve stability and performance. In this work, we combine transient photovoltage (TPV) and impedance spectroscopy (EIS) measurements to study how degradation affects both the active layer and the interlayer. We show that neither technique alone can provide a complete insight into both of these regions:TPV is more suited to studying degradation of the active layer; EIS clearly identifies the properties of the interlayer. By analysing both of these approaches we are able to assess how different interlayers impact the stability of the active layer, as well as how the interlayers themselves degrade and severely limit device performance. EIS measurements are also able to resolve the impact of the interlayer on series resistance even when it is not apparent from standard current-voltage ( JV) measurements. The technique could therefore be valuable for the optimisation of all devices. † Electronic supplementary information (ESI) available. See

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Section: Impedance Spectroscopy Measurementsmentioning

confidence: 99%

A combined transient photovoltage and impedance spectroscopy approach for a comprehensive study of interlayer degradation in non-fullerene acceptor organic solar cells

Pockett

Lee

et al. 2019

Nanoscale

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“…Compared to the advanced ultrafast optics measurements, [17][18][19][20][21][22][23][24][25][26][27][28][29] perturbation electrical transients (e.g. transient photocurrent (TPC) and photovoltage (TPV)) [30][31][32][33][34][35][36][37] enabled by optical excitation and electric detection provide an opportunity to study charge transport, recombination and even the hysteresis in a much wider time window. This technique has been widely applied for silicon, [38][39] sensitized, [40][41] quantum dot, 42 organic 43 and recent the perovskite solar cells.…”

Section: Introductionmentioning

confidence: 99%

“…This technique has been widely applied for silicon, [38][39] sensitized, [40][41] quantum dot, 42 organic 43 and recent the perovskite solar cells. [30][31][32][33][34][35] A generic physics model and quantitative analysis method centered on the charge occupation of subgap tail states has been extended from sensitized to current perovskite solar cells. [31][32][44][45][46] Within this model, the distribution of tail states has been interpreted as a common origin for the difference in the device performance and especially the open-circuit voltage, no matter the device structure and working mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, electrical transient is expected to be a powerful approach to reveal the charge loss mechanisms of a solar cell. [17][18] terahertz pump-probe technology (THz), [19][20][21] time-resolved photoluminescence (TRPL), [22][23][24][25][26] microwave photo-conduction (TRMC) [27][28][29] and TPC/TPV measurements [30][31][32][33][34][35][36][37] have been used to probe these carrier dynamic processes.…”

Section: Introductionmentioning

confidence: 99%

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Exploiting Electrical Transients to Quantify Charge Loss in Solar Cells

Shi

et al. 2020

Joule

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Electrical transients enabled by optical excitation and electric detection provide a distinctive opportunity to study the charge transport, recombination and even the hysteresis of a solar cell in a much wider time window ranging from nanoseconds to seconds. However, controversies on how to exploit these investigations to unravel the charge loss mechanism of the cell have been ongoing. Herein, a new methodology of quantifying the charge loss within the bulk absorber or at the interfaces and the defect properties of junction solar cells has been proposed after the conventional tail-state framework is firstly demonstrated to be unreasonable. This methodology has been successfully applied in the study of commercialized silicon and emerging Cu 2 ZnSn(S, Se) 4 and perovskite solar cells herein and should be universal to other photovoltaic device systems with similar structures. Overall, this work provides an alluring route for comprehensive investigation of dynamic physics processes and charge loss mechanism of junction solar cells and possesses potential applications for other optoelectronic devices.

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“…(18), consistent with previous experimental findings. 24,33 In the limit when the electron and hole densities are homogenous across the active layer, corresponding to sufficiently high steady-state light intensities, we obtain B,eff =…”

Section: Small-perturbation Transient Photovoltagementioning

confidence: 99%

A Theoretical Perspective on Transient Photovoltage and Charge Extraction Techniques

Sandberg

Tvingstedt

Meredith

et al. 2019

Proceedings of the nanoGe Fall Meeting 2019

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Transient photovoltage (TPV) is a technique frequently used to determine charge carrier lifetimes in thin-film solar cells such as organic, dye sensitized and perovskite solar cells. As this lifetime is often incident light intensity dependent, its relevance to understanding the intrinsic properties of a photoactive material system as a material or device figure of merit has been questioned. To extract complete information on recombination dynamics, the TPV measurements are often performed in conjunction with charge extraction (CE) measurements, employed to determine the photo-generated charge carrier density and thereby the recombination rate constant and its order. In this communication, the underlying theory of TPV and CE is reviewed and expanded. Our theoretical findings are further solidified by numerical simulations and experiments on organic solar cells. We identify regimes of the open-circuit voltage within which accurate lifetimes and carrier densities can be determined with TPV and CE experiments. A wide range of steady-state light intensities is required in performing these experiments in order to identify their "working dynamic range" from which the recombination kinetics in thin-film solar cells can be determined.

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Revisiting lifetimes from transient electrical characterization of thin film solar cells; a capacitive concern evaluated for silicon, organic and perovskite devices

Abstract: Here we re-evaluate previously assigned carrier lifetimes as being severely influenced by the decay rate of spatially separated charge carriers.

Cited by 105 publications

References 48 publications

A combined transient photovoltage and impedance spectroscopy approach for a comprehensive study of interlayer degradation in non-fullerene acceptor organic solar cells

A combined transient photovoltage and impedance spectroscopy approach for a comprehensive study of interlayer degradation in non-fullerene acceptor organic solar cells

Exploiting Electrical Transients to Quantify Charge Loss in Solar Cells

A Theoretical Perspective on Transient Photovoltage and Charge Extraction Techniques

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