Impedance Spectroscopy Measurements in Perovskite Solar Cells: Device Stability and Noise Reduction

Pitarch-Tena, Didac; Ngo, Thi Tuyen; Vallés‐Pelarda, Marta; Pauporté, Thierry; Mora‐Seró, Iván

doi:10.1021/acsenergylett.8b00465

Cited by 108 publications

(104 citation statements)

References 33 publications

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“…IS measurements are performed on complete, planar PSCs with various UVO treatments to evaluate variations in V oc , FF, and PCE. Measurements were carried out under Xenon lamp (intensity 100 mW cm −2 ) illumination over a wide range of applied voltages and frequencies (from 0 up to V oc and from 1 MHz to 0.1 Hz) . The fitting has been performed using the equivalent circuits discussed by Yoo et al and the recombination resistance ( R rec ) has been approached by addition of the resistances of high frequency and low frequency (lf) semicircles obtained in the Nyquist plot, (Figure S5, Supporting Information).…”

Section: Figures Of Merits Jsc Ff Voc and Pce Expressed As Mean mentioning

confidence: 99%

Analysis of the UV–Ozone‐Treated SnO₂ Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

et al. 2019

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Tin oxide (SnO2) is widely used as an electron transporting layer (ETL) in perovskite solar cells (PSCs) because of its good transparency, band alignment to perovskite, and stability. The interface between the ETL and the perovskite in the PSCs affects the charge extraction process and influences the optoelectronic properties. Surface treatment of SnO2, such as the UV–ozone (UVO) treatment, is shown to enhance the efficiency and reduce the light soaking effect of the PSCs. Herein, the success in control and suppressing hysteresis reaching the highest photoconversion efficiency of 19.4% with negligible hysteresis for the growth of the devices on SnO2 treated with UVO for 60 min is reported. The wettability of the treated SnO2 is well matched with the polar solvent of the perovskite solution, leading to complete coverage of the substrate, although the treatment does not affect the morphology and the crystallinity of the perovskite thin films. Impedance spectroscopy measurement analysis clearly indicates the decrease in the recombination rate after the UVO treatment and the reduction in low frequency capacitance causing a reduction in the current–potential curve hysteresis.

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Section: Figures Of Merits Jsc Ff Voc and Pce Expressed As Mean mentioning

confidence: 99%

Analysis of the UV–Ozone‐Treated SnO₂ Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

et al. 2019

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“…IS has emerged as a powerful and unique technique for investigation of various processes taking place in the PSCs under illumination and in dark and how they are influenced by other layers. Research efforts have been made to demonstrate the use of IS to compare the performance of perovskite optoelectronics …”

Section: Is Characteristics For Photovoltaic Devicesmentioning

confidence: 99%

Impedance Spectroscopy: A Versatile Technique to Understand Solution‐Processed Optoelectronic Devices

Ali

Chang

Imran

et al. 2019

Physica Rapid Research Ltrs

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Solution‐processed optoelectronic devices based on conjugated polymers, colloidal quantum dots (CQDs), halide perovskites, and so on are now emerging as a new‐generation semiconductor technology which prevails its conventional counterparts in terms of low fabrication cost, ease of scalable manufacturing, and abundant material designability. However, the solution‐processed thin films obtained through spin‐coating, spray, inkjet printing, and doctor blading usually suffer from low film quality and a high defect density especially at the interfaces of different functional layers. Currently, the most significant subject is to address the non‐ideal interfaces for achieving improved performance of the devices. Impedance spectroscopy (IS) is a universal technique that can help to examine the charge behavior at the interfaces in an electrochemical or solid‐state multilayered device. Owing to its ability to elucidate the charge transfer, charge transport, and accumulation within the interfaces of electrochemical or multilayered devices with minimal effects to the devices themselves, the use of IS has increased vividly in the last decades. This review provides the basic principles of IS and its applications on solution‐processed optoelectronic devices.

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“…The other well-dened operating point would be a voltage of 0 V (J SC ). However, the impedance at 0 V is not very useful because it increases to very large magnitudes and the time constants are much larger, which means that the measurement time increases to impractical timescales and the whole spectrum can hardly be measured accurately as demonstrated by Pitarch-Tena et al 8 A consistent measurement procedure that provides both consistent EIS and performance in one simple measurement routine is yet to be proposed.…”

Section: General Consequences For Impedance Studies On Pscmentioning

confidence: 99%

“…The major driving force to employ EIS for PSCs is the lack of knowledge about the details of the reversible and irreversible, the benecial and detrimental processes that occur in PSCs with respect to operating conditions and material compositions. [4][5][6][7][8] Conveniently, the features to be identied by EIS are in the practical frequency range for ordinary EIS (1 MHz to $50 mHz). However, the limited stability of PSC has hampered a consistent analysis and the establishment of a physically based equivalent circuit model (ECM) so far.…”

Section: Introductionmentioning

confidence: 99%

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Detecting and identifying reversible changes in perovskite solar cells by electrochemical impedance spectroscopy

et al. 2019

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The current status of electrochemical impedance spectroscopy (EIS) and related analysis on perovskite solar cells (PSC) is still unsatisfactory. The provided models are still vague and not really helpful for guiding the efforts to develop more efficient and stable devices. Due to the slow and complex dynamics of these devices, the obtained spectra need to be validated, which is hardly ever done. This study may be the first to provide fully validated impedance spectra and presents reproducible EIS time series at open circuit voltage (V OC ) for more than 20 hours, with a total of 140 analysed spectra. We conclude that the observed changes stem from a temporary reduction of the electronically active area of the devices, as can be deduced from the inverse behaviour of resistance and capacitance. The changes in these values are almost 100% reversible if the devices are kept in the dark for only one day, while the time constant of the high-frequency process remains unchanged throughout the whole characterization procedure. The tested devices are full PSC devices that have proven to be stable over more than 500 hours, and the non-steady impedance measurements shine a critical light on previously published EIS data. With the results of this study, it can be rationalized that the high-frequency semicircle can serve as a good indicator for ionic migration by monitoring its consequences. The results presented here are helpful to quantify ionic migration on the device level in order to derive new stability criteria and countermeasures against degradation.

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Impedance Spectroscopy Measurements in Perovskite Solar Cells: Device Stability and Noise Reduction

Cited by 108 publications

References 33 publications

Analysis of the UV–Ozone‐Treated SnO₂ Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

Analysis of the UV–Ozone‐Treated SnO₂ Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

Impedance Spectroscopy: A Versatile Technique to Understand Solution‐Processed Optoelectronic Devices

Detecting and identifying reversible changes in perovskite solar cells by electrochemical impedance spectroscopy

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Impedance Spectroscopy Measurements in Perovskite Solar Cells: Device Stability and Noise Reduction

Cited by 108 publications

References 33 publications

Analysis of the UV–Ozone‐Treated SnO2 Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

Analysis of the UV–Ozone‐Treated SnO2 Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

Impedance Spectroscopy: A Versatile Technique to Understand Solution‐Processed Optoelectronic Devices

Detecting and identifying reversible changes in perovskite solar cells by electrochemical impedance spectroscopy

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Product

Resources

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Analysis of the UV–Ozone‐Treated SnO₂ Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

Analysis of the UV–Ozone‐Treated SnO₂ Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis