Low-Frequency Carrier Kinetics in Perovskite Solar Cells

Sangwan, Vinod K.; Zhu, Menghua; Clark, Sarah; Luck, Kyle A.; Marks, Tobin J.; Kanatzidis, Mercouri G.; Hersam, Mark C.

doi:10.1021/acsami.9b03884

Cited by 28 publications

(29 citation statements)

References 58 publications

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“…The raise of capacitance at low frequency has been interpreted in many cases as the manifestation of bulk traps. However a recent study 35 using the analysis of low frequency noise has found that the capacitance does not scale with thickness, in agreement with the previous scaling properties obtained by impedance spectroscopy. 36 Figure 4.…”

Section: Ionic Effects At the Interfacesupporting

confidence: 85%

Kinetic and material properties of interfaces governing slow response and long timescale phenomena in perovskite solar cells

Wang

Guerrero

Bou

et al. 2019

Energy Environ. Sci.

172

232

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Section: Ionic Effects At the Interfacesupporting

confidence: 85%

Kinetic and material properties of interfaces governing slow response and long timescale phenomena in perovskite solar cells

Wang

Guerrero

Bou

et al. 2019

Energy Environ. Sci.

172

232

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“…Considering the time span of the experiments, the OCVD measurements have little to do with the degradations of the cells; rather, they indicate the effect is also clearly evident in the low frequency capacitance measurements. In this line, frequency dependent capacitance measurements under dark portray a significant change in the electrode polarization [29][30][31] as shown in Fig. S9 in the supplementary material.…”

Section: ) and S8(b)mentioning

confidence: 74%

Enhanced operational stability through interfacial modification by active encapsulation of perovskite solar cells

Ghosh¹,

Singh

Subbiah

et al. 2020

Applied Physics Letters

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Encapsulates are, in general, the passive components of any photovoltaic device that provides the required shielding from the externally stimulated degradation. Here we provide comprehensive physical insight depicting a rather non-trivial active nature, in contrast to the supposedly passive, atomic layer deposition (ALD) grown Al 2 O 3 encapsulate layer on the hybrid perovskite [(FA 0.83 MA 0.17 ) 0.95 Cs 0.05 PbI 2.5 Br 0.5 ] photovoltaic device having the configuration: glass/FTO/SnO 2 /perovskite/spiro-OMeTAD/Au/(6) Al 2 O 3 . By combining various electrical characterization techniques, our experimental observations indicate that the ALD chemistry produces considerable enhancement of the electronic conductivity of the spiro-OMeTAD hole transport medium (HTM), resulting in electronic modification of the perovskite/HTM interface. Subsequently, the modified interface provides better hole extraction and lesser ionic accumulation at the interface, resulting in a significant lowering of the burn-in decay and nearly unchanged charge transport parameters explicitly under the course of continuous operation. Unlike the unencapsulated device, the modified electronic structure in the Al 2 O 3 coated device is essentially the principal reason for better performance stability. Data presented in this communication suggest that the ionic accumulation at the spiro-OMeTAD/perovskite interface triggers the device degradation in the uncoated devices, which is eventually followed by material degradation, which can be avoided by active encapsulation.

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“…The investigation of fluctuation phenomena, which may be called "fluctuation spectroscopy", is a very informative method for the study of kinetic processes in matter. It is often also a method that is much more sensitive than the measurement of average quantities, as demonstrated in superconducting thin films [31][32][33][34] and devices [35][36][37][38], in low-dimensional conductors [39][40][41][42], in carbon nanotubes [43][44][45][46][47] and magnetic composites [48,49], and in conventional [50,51] and innovative solar cells [52][53][54][55]. The role of the noise spectrum analyzer is similar to the role of a microscope: It enables us to visualize the microscopic motion and transitions of particles.…”

Section: Introductionmentioning

confidence: 99%

What Can Electric Noise Spectroscopy Tell Us on the Physics of Perovskites?

Barone

Pagano

2021

Coatings

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Electric noise spectroscopy is a non-destructive and a very sensitive method for studying the dynamic behaviors of the charge carriers and the kinetic processes in several condensed matter systems, with no limitation on operating temperatures. This technique has been extensively used to investigate several perovskite compounds, manganese oxides (La1−xSrxMnO3, La0.7Ba0.3MnO3, and Pr0.7Ca0.3MnO3), and a double perovskite (Sr2FeMoO6), whose properties have recently attracted great attention. In this work are reported the results from a detailed electrical transport and noise characterizations for each of the above cited materials, and they are interpreted in terms of specific physical models, evidencing peculiar properties, such as quantum interference effects and charge density waves.

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Low-Frequency Carrier Kinetics in Perovskite Solar Cells

Cited by 28 publications

References 58 publications

Kinetic and material properties of interfaces governing slow response and long timescale phenomena in perovskite solar cells

Kinetic and material properties of interfaces governing slow response and long timescale phenomena in perovskite solar cells

Enhanced operational stability through interfacial modification by active encapsulation of perovskite solar cells

What Can Electric Noise Spectroscopy Tell Us on the Physics of Perovskites?

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