A noise model for the evaluation of defect states in solar cells

Landi, Giovanni; Barone, C.; Mauro, Costantino; Neitzert, H. C.; Pagano, S.

doi:10.1038/srep29685

Cited by 37 publications

(39 citation statements)

References 29 publications

(45 reference statements)

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“…It should be mentioned, that in the electronic industry, noise is indeed often used as early indicator for device failure . For example the thermally induced degradation of polymer solar cells had been monitored with noise spectroscopy and the electronic defect formation in crystalline silicon solar cells under space‐conditions has been recently determined using low‐frequency noise measurement .…”

Section: Resultsmentioning

confidence: 99%

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

Nobile

Valentino

Morcom

et al. 2017

Polymer Engineering & Sci

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The morphological, rheological and electrical properties of nanocomposites based on multi‐walled carbon nanotubes (MWNTs) and high density polyethylene (HDPE), prepared by melt mixing, have been investigated. The effects of temperature, MWNT concentration and nanotube surface treatment have been analyzed. A good dispersion of oxidized nanotubes in the HDPE matrix was found using electron microscopy investigations, as has also been found in the case of related nonfunctionalized MWNTs. The rheological oscillatory shear tests in the melt state have been carried out with strain amplitude values within the linear viscoelastic region. The rheological measurements on the nonfunctionalized MWNT/HDPEs revealed that the percolation threshold was temperature dependent with lower values at higher temperatures. At low frequencies, the oxidized MWNTs/HDPE composites showed storage modulus and complex viscosity values lower than the corresponding values measured for nanocomposites prepared with nonfunctionalized MWNTs. The conductivity decrease is more than 2 orders of magnitude for the sample with 2.5 wt% oxidized MWNTs, compared to the un‐oxidized comparator materials. A constant voltage, long‐term stability test allowed to estimate the average number of electrically active percolation paths and showed that stepwise conductivity loss is preceded by a strong increase in the noise amplitude related to the electrical current. POLYM. ENG. SCI., 57:665–673, 2017. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

Nobile

Valentino

Morcom

et al. 2017

Polymer Engineering & Sci

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“…We emphasize the utility of noise measurements as a quantitative tool to gauge and understand the extent of degradation in these devices . It has been used to study systems like quantum wires, graphene, FETs, along with different solar cells including silicon, organic, and DSSCs . Moreover, electrochemical systems involving ionic interactions are studied as well.…”

Section: Introductionmentioning

confidence: 99%

Insights Into the Microscopic and Degradation Processes in Hybrid Perovskite Solar Cells Using Noise Spectroscopy

et al. 2017

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We report a clear correlation of the features observed in photocurrent noisefluctuations to the performance parameters of hybrid perovskite solar cells. The general trend of increasing noise amplitude which spreads over a wider range of frequency as a function of aging is established. High-resolution spatial mapping of the photocurrent in typical devices and the associated variation of the noise spectrum confirms the underlying trend.

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“…In particular, Equation describes 1/ f noise in the dark for a diffusion‐current dominated p‐n junction diode (an analogous case to OPVs)

S_{normalI} (f) = \frac{α_{normalH} q I_{0}}{4 f τ} (e^{\frac{q V}{k_{B} T}} - 1 - \frac{q V}{k_{B} T})

where S I ( f ) is the current power spectral density, α H is the Hooge parameter, q is the elementary unit of charge, I 0 is the reverse bias saturation current, f is frequency, τ is the charge carrier lifetime, V is the applied bias, k B is Boltzmann's constant, and T is temperature. While the Kleinpenning p‐n junction noise model has been successful in describing classical systems such as silicon solar cells, it has not yet been attempted for OPVs …”

Section: Resultsmentioning

confidence: 99%

Correlated In Situ Low‐Frequency Noise and Impedance Spectroscopy Reveal Recombination Dynamics in Organic Solar Cells Using Fullerene and Non‐Fullerene Acceptors

Luck

Sangwan

Hartnett

et al. 2017

Adv Funct Materials

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Non-fullerene acceptors based on perylenediimides (PDIs) have garnered significant interest as an alternative to fullerene acceptors in organic photovoltaics (OPVs), but their charge transport phenomena are not well understood, especially in bulk heterojunctions (BHJs). Here, we investigate charge transport and current fluctuations by performing correlated lowfrequency noise and impedance spectroscopy measurements on two BHJ OPV systems, one employing a fullerene acceptor and the other employing a dimeric PDI acceptor. In the dark, OPVs. An inverse correlation is also observed between noise spectral density and power conversion efficiency. Overall, these results show that low-frequency noise spectroscopy is an effective in-situ diagnostic tool to assess charge transport in emerging photovoltaic materials, thereby providing quantitative guidance for the design of nextgeneration solar cell materials and technologies.

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A noise model for the evaluation of defect states in solar cells

Cited by 37 publications

References 29 publications

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites

Insights Into the Microscopic and Degradation Processes in Hybrid Perovskite Solar Cells Using Noise Spectroscopy

Correlated In Situ Low‐Frequency Noise and Impedance Spectroscopy Reveal Recombination Dynamics in Organic Solar Cells Using Fullerene and Non‐Fullerene Acceptors

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