Suppressing recombination in perovskite solar cells via surface engineering of TiO2 ETL

Prochowicz, Daniel; Tavakoli, Mohammad Mahdi; Wolska‐Pietkiewicz, Małgorzata; Jędrzejewska, Maria; Trivedi, Suverna; Kumar, Manoj; Zakeeruddin, Shaik M.; Lewiński, Janusz; Gräetzel, Michael; Yadav, Pankaj

doi:10.1016/j.solener.2019.12.070

Cited by 65 publications

(49 citation statements)

References 60 publications

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“…[34,35] ) The modification of ETL led to an increase in V OC and FF of the devices, as reported in our previous studies. [34,35] The EIS of the devices were measured at bias above the V bi of PSCs, as in this region, the net response of the device is mainly because of recombination rather than charge injection. Figure 2a-c shows the Im(Z) versus frequency, capacitance versus frequency, and EIS response of pristine TiO 2 and TiO 2 /ZnO ETL-based PSCs, respectively.…”

Section: Effect Of Etl/perovskite Interface Engineering On the Low-frequency Arc In Eis Of Pscsupporting

confidence: 80%

“…(For detailed experimental procedure, refer the studies by Yadav and coworkers. [34,35] The results of the devices studied here are from the same batch as in the studies by Yadav and coworkers. [34,35] ) The modification of ETL led to an increase in V OC and FF of the devices, as reported in our previous studies.…”

Section: Effect Of Etl/perovskite Interface Engineering On the Low-frequency Arc In Eis Of Pscmentioning

confidence: 99%

“…[34,35] The results of the devices studied here are from the same batch as in the studies by Yadav and coworkers. [34,35] ) The modification of ETL led to an increase in V OC and FF of the devices, as reported in our previous studies. [34,35] The EIS of the devices were measured at bias above the V bi of PSCs, as in this region, the net response of the device is mainly because of recombination rather than charge injection.…”

Section: Effect Of Etl/perovskite Interface Engineering On the Low-frequency Arc In Eis Of Pscmentioning

confidence: 99%

“…The reproducibility of photovoltaic parameters in their respective batches can be found in our previous work. [34,35] Looking at the values of R HF and R LF of TiO 2 /SnO 2 and TiO 2 /ZnO PSCs, lower recombination and higher V OC are expected for TiO 2 /SnO 2 PSCs. Although the ZnO ETL has higher electron mobility, the remaining hydroxide (OH À ) surface ions on ZnO ETL can induce the degradation of perovskite absorber layer.…”

Section: Effect Of Etl/perovskite Interface Engineering On the Low-frequency Arc In Eis Of Pscmentioning

confidence: 99%

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In the Quest of Low‐Frequency Impedance Spectra of Efficient Perovskite Solar Cells

et al. 2021

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Measurement and understanding of electrochemical impedance spectroscopy of perovskite solar cells (PSCs) are nontrivial, as perovskite absorbers are a mixed conductor exhibiting both ionic and electronic motion. Moreover, the interpretation of the low-frequency spectra especially low-frequency resistance (R LF ) is ambiguous. Some reports suggest that R LF is related to ionic transport resistance, whereas others attribute it with the recombination processes. Herein, more light is put on the quest of low-frequency impedance spectra of efficient PSCs. It is found that high-and low-frequency resistances (R HF and R LF ) follow a similar dependence on the applied bias and illumination with a comparable slope. These resistances are associated with the recombination processes in PSCs. The relation between low-frequency spectra of PSCs and the physical parameters such as the role of the interface, grains' sizes, and perovskite composition is studied. It is found that the low-frequency spectra of PSCs mainly depend on the grains' sizes and shift toward the high frequency, i.e., toward faster time constants with increasing the grain size. It is observed that these devices exhibit the lower recombination and higher open-circuit voltage. A convenient way for the in-depth analysis of PSCs, which will be crucial for designing better-performing PSCs, is provided.

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Section: Effect Of Etl/perovskite Interface Engineering On the Low-frequency Arc In Eis Of Pscsupporting

confidence: 80%

Section: Effect Of Etl/perovskite Interface Engineering On the Low-frequency Arc In Eis Of Pscmentioning

confidence: 99%

Section: Effect Of Etl/perovskite Interface Engineering On the Low-frequency Arc In Eis Of Pscmentioning

confidence: 99%

Section: Effect Of Etl/perovskite Interface Engineering On the Low-frequency Arc In Eis Of Pscmentioning

confidence: 99%

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In the Quest of Low‐Frequency Impedance Spectra of Efficient Perovskite Solar Cells

et al. 2021

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“…The crystallographic defects also play an important role in electron conduction ability and light absorption of the semiconductors. According to [ 13 ], TiO 2 /electrolyte interface defects, grain boundaries, bulk defects, and/or surface states (the energy states generated below the conduction band) impede the transport of electrons and promote undesired recombination reactions. Studies with solar cells constructed with different types of ZnO [ 14 ] showed that high concentrations of nonradioactive defects are deleterious to the photovoltaic performance of ZnO DSSCs, whereas, for radiative defects, samples displaying orange-red photoluminescent emission exhibited better performance compared with samples associated with green photoluminescent emission.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic ZnO for Dye-Sensitized Solar Cells

Orozco-Messana

2020

Nanomaterials

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A research study on the application of biomimetic ZnO (from eggshell membranes) as photoanodes in dye-sensitized solar cells (DSSCs) is presented. Biomimetic ZnO powder was produced and characterized. Its surface area, crystallinity, and morphology were analyzed and compared to commercial ZnO. Then, solar cells with and without dye were assembled using both the biomimetic and commercial oxides. On the dye-less cell, the oxide assumes the role of the photon absorber, while in the dye-sensitized cells, the oxide’s major function is the separation of the electron-hole pair and conduction of the electric charges formed. The characterization of the oxides showed that the biomimetic synthesis produced ZnO with a larger surface area, smaller crystallite size, and larger light absorption, possibly due to crystalline defects. SEM analysis on biomimetic ZnO revealed a tubular microstructure formed by nanocrystals, instead of the commercial powder showing spherical particles.

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Light Intensity Analysis of Photovoltaic Parameters for Perovskite Solar Cells

2021

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The number of publications on perovskite solar cells (PSCs) continues to grow exponentially. Although the efficiency of PSCs has exceeded 25.5%, not every research laboratory can reproduce this result or even pass the border of 20%. Unfortunately, it is not always clear which dominating mechanism is responsible for the performance drop. Here, a simple method of light intensity analysis of the JV parameters is developed, allowing an understanding of what the mechanisms are that appear in the solar cell and limit device performance. The developed method is supported by the drift‐diffusion model and is aimed at helping in the explanation of parasitic losses from the interface or bulk recombination, series resistance, or shunt resistance in the perovskite solar cell. This method can help not only point toward the dominating of bulk or interface recombination in the devices but also determine which interface is more defective. A detailed and stepwise guidance for such a type of light intensity analysis of JV parameters is provided. The proposed method and the conclusions of this study are supported by a series of case studies, showing the effectiveness of the proposed method on real examples.

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Suppressing recombination in perovskite solar cells via surface engineering of TiO2 ETL

Cited by 65 publications

References 60 publications

In the Quest of Low‐Frequency Impedance Spectra of Efficient Perovskite Solar Cells

In the Quest of Low‐Frequency Impedance Spectra of Efficient Perovskite Solar Cells

Biomimetic ZnO for Dye-Sensitized Solar Cells

Light Intensity Analysis of Photovoltaic Parameters for Perovskite Solar Cells

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