Imaging the local ideality factor by contactless photoluminescence measurement

Hameiri, Ziv; Chaturvedi, Pooja; McIntosh, Keith R.

doi:10.1063/1.4812835

Cited by 24 publications

(9 citation statements)

References 11 publications

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“…But these studies had a different purpose than our study. In several investigations the measurements were performed on finished solar cells or the goal was to determine the recombination activity of grain boundaries or the radiative recombination coefficient . In another study an approach similar to ours was used to differentiate between bulk and interface recombination.…”

Section: Introductionmentioning

confidence: 99%

The Optical Diode Ideality Factor Enables Fast Screening of Semiconductors for Solar Cells

2018

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In the search for new materials for solar cells, a fast feedback is needed. Radiative efficiency measurements based on photoluminescence (PL) are the tool of choice to screen the voltage a material is capable of. Additionally the dependence of the radiative efficiency on excitation density contains information on the diode ideality factor, which determines in turn the fill factor of the solar cell. Both parameters are immediate ingredients of the efficiency of a solar cell and can be determined from PL measurements, which allow fast feedback. The method to determine the optical diode ideality factor from PL measurements and compare to electrical measurements in finished solar cells are discussed.

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Section: Introductionmentioning

confidence: 99%

The Optical Diode Ideality Factor Enables Fast Screening of Semiconductors for Solar Cells

2018

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“…We combine luminescence measurements with detailed balance calculations to create maps of the following parameters which link directly to PV performance losses: QFLS at open circuit, which is closely linked to V OC loss; charge collection quality, a metric linked to J SC loss; and the ideality factor n , which encodes information about the dominant recombination mechanism in the material. The QFLS and ideality factor maps are produced in this work using adaptations of methods previously reported. − The luminescence-derived charge collection quality as a metric for short circuit current loss will be justified and experimentally validated in a later section.…”

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confidence: 99%

Visualizing Macroscopic Inhomogeneities in Perovskite Solar Cells

et al. 2022

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Despite the incredible progress made, the highest efficiency perovskite solar cells are still restricted to small areas (<1 cm 2 ). In large part, this stems from a poor understanding of the widespread spatial heterogeneity in devices. Conventional techniques to assess heterogeneities can be time consuming, operate only at microscopic length scales, and demand specialized equipment. We overcome these limitations by using luminescence imaging to reveal large, millimeter-scale heterogeneities in the inferred electronic properties. We determine spatially resolved maps of "charge collection quality", measured using the ratio of photoluminescence intensity at open and short circuit. We apply these methods to quantify the inhomogeneities introduced by a wide range of transport layers, thereby ranking them by suitability for upscaling. We reveal that top-contacting transport layers are the dominant source of heterogeneity in the multilayer material stack. We suggest that this methodology can be used to accelerate the development of highly efficient, large-area modules, especially through high-throughput experimentation.

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“…They are used across the entire value chain including silicon bricks, [ 18 ] wafers, [ 16 ] cells, [ 19 ] and modules, [ 20,21 ] significantly contributing to process optimization of silicon PV devices. A wide range of electrical parameters have been quantified and spatially resolved, including implied open‐circuit voltage (i V OC ), [ 22 ] ideality factor, [ 23 ] dark saturation current–density ( J 0 ), [ 24,25 ] shunt resistance, [ 26–28 ] series resistance ( R s ), [ 24,29–32 ] and others. [ 15,33 ]…”

Section: Introductionmentioning

confidence: 99%

Contactless Series Resistance Imaging of Perovskite Solar Cells via Inhomogeneous Illumination

et al. 2021

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A contactless effective series resistance imaging method for large‐area perovskite solar cells that is based on photoluminescence imaging with nonuniform illumination is introduced and demonstrated experimentally. The proposed technique is applicable to partially and fully processed perovskite solar cells if laterally conductive layers are present. The capability of the proposed contactless method to detect features with high effective series resistance is validated by comparison with various contacted mode luminescence imaging techniques. The method can reliably provide information regarding the severeness of the detected series resistance through photoexcitation pattern manipulation. Application of the method to subcells in monolithic tandem devices, without the need for electrical contacting the terminals, appears feasible.

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Imaging the local ideality factor by contactless photoluminescence measurement

Cited by 24 publications

References 11 publications

The Optical Diode Ideality Factor Enables Fast Screening of Semiconductors for Solar Cells

The Optical Diode Ideality Factor Enables Fast Screening of Semiconductors for Solar Cells

Visualizing Macroscopic Inhomogeneities in Perovskite Solar Cells

Contactless Series Resistance Imaging of Perovskite Solar Cells via Inhomogeneous Illumination

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