Characterization of solar cells using electroluminescence and photoluminescence hyperspectral images

Delamarre, Amaury

doi:10.1117/1.jpe.2.027004

Cited by 44 publications

(25 citation statements)

References 4 publications

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“…[20][21][22]27 The setup is calibrated by comparing data that have been recorded by a hyperspectral imager (HI) which has previously demonstrated its reliability on several PV absorber. [21][22][23]26 The experimental results we present here are obtained with an equivalent collection and detection area, and the excitation power range varies from about 2000 kW/m 2 to 45 000 kW/m 2 (this compared to 2000 and 45 000 Suns). It is worth noting that all the measurements are done at 300 K under CW excitation, which makes the measurements relevant for solar cell operation under concentrated solar flux.…”

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confidence: 99%

Experimental evidence of hot carriers solar cell operation in multi-quantum wells heterostructures

Rodière

Lombez

Corre

et al. 2015

Applied Physics Letters

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International audienceWe investigated a semiconductor heterostructure based on InGaAsP multi quantum wells (QWs) using optical characterizations and demonstrate its potential to work as a hot carrier cell absorber. By analyzing photoluminescence spectra, the quasi Fermi level splitting Dl and the carrier temperature are quantitatively measured as a function of the excitation power. Moreover, both thermodynamics values are measured at the QWs and the barrier emission energy. High values of Dl are found for both transition, and high carrier temperature values in the QWs. Remarkably, the quasi Fermi level splitting measured at the barrier energy exceeds the absorption threshold of the QWs. This indicates a working condition beyond the classical Shockley-Queisser limit

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confidence: 99%

Experimental evidence of hot carriers solar cell operation in multi-quantum wells heterostructures

Rodière

Lombez

Corre

et al. 2015

Applied Physics Letters

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“…Besides a convenient calibration method [2], the HI setup presents several differences when compared to confocal microscope setups. Indeed, confocal microscope setups probe the luminescence from a confocal volume, and scan the sample surface to produce a map.…”

Section: A Experimental Setup Descriptionmentioning

confidence: 99%

“…1. Using the reciprocity relations that exists between an LED and a solar cell, the External Quantum Efficiency map can be obtained from EL spectrum [2]. Finally, because the photogeneration and the dark current are known at each point, the local efficiency can be evaluated as long as the superposition principle holds, which also includes low series resistance.…”

Section: B Proof Of Concept -Validitymentioning

confidence: 99%

“…Several parameters are thus accessible using this relation. Access to Δµeff is certainly the most unique point since, in some cases this quantity could be identified with the voltage across the cell [1][2][3]. Therefore, this is an electrical quantity contained in an optical signal.…”

Section: Introductionmentioning

confidence: 98%

“…A technique that would enable directly, and in a massively parallel fashion, the evaluation of the photovoltaic performance is obviously an objective with high stakes. It turns out that photoluminescence (PL) and electroluminescence (EL) spectra allow the determination of important optoelectronic parameters of solar cells, such as the open circuit voltage from PL [1] or the external quantum efficiency (EQE) from EL [2]. To get an accurate measurement of those parameters and thus a correct understanding, experimental conditions have to be properly set.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Photovoltaic Absorbers for High Throughput Processing

et al. 2014

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We analyze photoluminescence (PL) and electroluminescence (EL) using a hyperspectral imager that records spectrally resolved luminescence images of solar cell absorbers. The system is calibrated to yield the luminescence flux in absolute values. This system enables to quantitatively image physical parameters such as the photovoltage with an uncertainty of less than 30mV. The wide field illumination, low power excitation and fast acquisition brings new insights compare to classical setups such as confocal microscope. Several types of absorbers have been analyzed. For instance, we can investigate spatial fluctuations of the Quasi Fermi Levels splitting in CIGS polycristalline absorbers and link those fluctuations to transport properties. The method is general to the point that third generation PV cells absorbers can also be evaluated. We illustrate the great potential of our setup by imaging quasi Fermi levels splitting in Intermediate Band Solar cells. Such techniques, directly evaluating the performance of photovoltaic absorbers and devices are needed for fast, high throughput investigations of combinatorial experiments such as the projects carried out for the material genomics programme.

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Imaging Spatial Variations of Optical Bandgaps in Perovskite Solar Cells

Chen

Peng

Shen

et al. 2018

Advanced Energy Materials

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their optical and electrical properties. A common optical-based approach to estimate bandgaps of direct-gap semiconductors is to employ absorption spectroscopy. In this approach, one captures absorption spectra of materials and obtains absorption thresholds from Tauc plots. [3] The Tauc analysis provides a consistent way to compare among materials. However, as mentioned by Green et al., [4] these thresholds represent optical bandgaps, not electronic bandgaps, as the Tauc analysis underestimates the presence of excitonic transitions and broadening factors such as temperatures, defect densities, and material disorders. [4,5] Alternatively, one can capture the so-called band-to-band luminescence spectra from materials, which are results of radiative recombination between free electrons and holes in the conduction and valence bands, respectively. The peak wavelengths (or energies) of the luminescence spectra have been reported to be close to the absorption thresholds at room temperature by numerous authors [6][7][8][9][10] (also see Figure S1, Supporting Information). Thus, the two optical methods can be used to estimate the material optical bandgap although they often underestimate the true electronic bandgap. However, both of these approaches measure the spatially average optical bandgap over a certain area. Therefore, capturing spatially resolved optical bandgaps of the entire sample area requires point-by-point mapping in both X and Y directions, and thus it is time consuming and impractical for large-area device imaging or high-throughput production-line environments.In PV research and manufacturing, luminescence imaging, including both electroluminescence (EL) and photoluminescence (PL), is a mainstream characterization tool for crystalline silicon solar cells. [11][12][13][14][15][16][17] This camera-based method can provide fast diagnostics of PV materials and devices with micrometerscale spatial resolution. Recently, luminescence imaging has increased in significance for perovskite device and material characterization. Many works have extracted various device parameters of PSCs such as correlations between luminescence intensities and open-circuit voltages, [18][19][20] spatial distributions of nonradiative recombination centers, [21,22] series resistances from EL images, [23] and lateral inhomogeneities on each subcell in monolithic perovskite-silicon tandem structures. [24] It is also a powerful tool for monitoring long-term performance and A fast, nondestructive, camera-based method to capture optical bandgap images of perovskite solar cells (PSCs) with micrometer-scale spatial resolution is developed. This imaging technique utilizes well-defined and relatively symmetrical band-to-band luminescence spectra emitted from perovskite materials, whose spectral peak locations coincide with absorption thresholds and thus represent their optical bandgaps. The technique is employed to capture relative variations in optical bandgaps across various PSCs, and to resolve optical bandgap inhomogeneity within the same d...

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Characterization of solar cells using electroluminescence and photoluminescence hyperspectral images

Cited by 44 publications

References 4 publications

Experimental evidence of hot carriers solar cell operation in multi-quantum wells heterostructures

Experimental evidence of hot carriers solar cell operation in multi-quantum wells heterostructures

Characterization of Photovoltaic Absorbers for High Throughput Processing

Imaging Spatial Variations of Optical Bandgaps in Perovskite Solar Cells

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