Contactless and Spatially Resolved Determination of Current−Voltage Curves in Perovskite Solar Cells via Photoluminescence

Bui, Anh Dinh; Mahmud, M. A. Parvez; Mozaffari, Naeimeh; Basnet, Rabin; Duong, The; Bartholazzi, Gabriel; Le, Tien T.; Truong, Thien N.; Tebyetekerwa, Mike; Wibowo, Ary Anggara; Weber, Klaus; White, Thomas P.; Catchpole, Kylie; Macdonald, Daniel; Nguyen, Hieu T.

doi:10.1002/solr.202170083

Cited by 7 publications

(11 citation statements)

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“…In this section, we briefly describe the procedure to extract the implied open‐circuit voltage iV oc , ideality factor n id and activation energy E A of perovskite materials from their PL intensity. First, the method to extract iV oc from PL spectra has been described in our previous work 17 . Briefly, using the generalized Planck law, 19,22 the detected intensity at each pixel in the PL image emitted from the sample is given by 17

I_{xy_detected} = italicSF \times B ((), E) \exp ((), \frac{i V_{oc}}{V_{T}}),

where SF is a scaling factor, which accounts for the fraction of light emission detected by the measurement system, and E is the photon energy.…”

Section: Methods Descriptionsmentioning

confidence: 99%

“…First, the method to extract iV oc from PL spectra has been described in our previous work 17 . Briefly, using the generalized Planck law, 19,22 the detected intensity at each pixel in the PL image emitted from the sample is given by 17

I_{xy_detected} = italicSF \times B ((), E) \exp ((), \frac{i V_{oc}}{V_{T}}),

where SF is a scaling factor, which accounts for the fraction of light emission detected by the measurement system, and E is the photon energy. B ( E ) is a factor containing the sample's absorptivity and the system's spectral response.…”

Section: Methods Descriptionsmentioning

confidence: 99%

“…Photoluminescence (PL)‐based methods, both spectrally resolved and in imaging modes, have been demonstrated to be a powerful class of characterization techniques to investigate many important perovskite material and cell properties, 11,12 including quasi‐Fermi‐level splitting, 12–14 bandgap and subbandgap absorptivity 15,16 and current density–voltage ( JV ) curves 17,18 . PL‐based methods can overcome the aforementioned challenges because they do not require metal contacts.…”

Section: Introductionmentioning

confidence: 99%

“…Photoluminescence (PL)-based methods, both spectrally resolved and in imaging modes, have been demonstrated to be a powerful class of characterization techniques to investigate many important perovskite material and cell properties, 11,12 including quasi-Fermi-level splitting, 12-14 bandgap and subbandgap absorptivity 15,16 and current density-voltage (JV) curves. 17,18 PL-based methods can overcome the aforementioned challenges because they do not require metal contacts. Also, due to the direct relationship between PL intensities and implied open-circuit voltages (iV oc ) of perovskite materials, 12,13,19 it is possible to extract n id and E A of the materials by measuring their illumination intensity and temperature-dependent PL emissions only.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electrical properties of perovskite solar cells by illumination intensity and temperature‐dependent photoluminescence imaging

Bui

Mozaffari

Truong

et al. 2021

Progress in Photovoltaics

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Hybrid organic-inorganic perovskite solar cells (PSCs) are one of the most promising candidates for next generation photovoltaics. Further improvement in their performance, particularly efficiency, durability and reproducibility, requires a deep understanding of recombination losses during fabrication and within a device itself. In this work, we report a contactless, imaging-based procedure to spatially resolve electronic properties of PSCs including implied open-circuit voltage (iV oc ) and its temperature coefficient, ideality factor (n id ) and activation energy of recombination (E A ) by employing illumination intensity and temperature-dependent photoluminescence.The illumination intensity dependence of iV oc allows the extraction of n id whereas its temperature dependence allows the extraction of the temperature coefficient and E A . This imaging approach is then applied to investigate changes of these electronic parameters on fully and partially fabricated devices.

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I_{xy_detected} = italicSF \times B ((), E) \exp ((), \frac{i V_{oc}}{V_{T}}),

where SF is a scaling factor, which accounts for the fraction of light emission detected by the measurement system, and E is the photon energy.…”

Section: Methods Descriptionsmentioning

confidence: 99%

I_{xy_detected} = italicSF \times B ((), E) \exp ((), \frac{i V_{oc}}{V_{T}}),

Section: Methods Descriptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrical properties of perovskite solar cells by illumination intensity and temperature‐dependent photoluminescence imaging

Bui

Mozaffari

Truong

et al. 2021

Progress in Photovoltaics

Self Cite

View full text Add to dashboard Cite

show abstract

“…[1] Therefore, quantitative imaging techniques are crucial for evaluating device performance, improving manufacturing processes, and assessing device architectures. In particular, spatial imaging techniques help improve PV device reliability, [2] study degradation profiles in emerging PV devices, [3] or can be combined with modeling tools to study local defects and performance of PV devices. [4,5] Further development and investigation of latest silicon cell technologies such as tunnel oxide passivated contact (TOPCon) [6] and interdigitated back-contact (IBC) [6] cells can benefit from advanced spatial characterization techniques, also allowing investigation of degradation mechanisms and defects of established technologies.…”

Section: Introductionmentioning

confidence: 99%

Toward Megapixel Resolution Compressed Sensing Current Mapping of Photovoltaic Devices Using Digital Light Processing

2021

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Photocurrent response mapping is a powerful imaging technique for assessing defects and losses in photovoltaic devices. However, it has not enjoyed widespread application because high‐resolution measurements of large samples can last several hours, while weak signals from micrometer‐sized laser spots require lock‐in amplification. An alternative approach presented recently is the use of digital micromirror devices combined with compressed sensing theory. There are significant benefits when using such methods, such as signal amplification, undersampling options, and simplified measurement systems. Nevertheless, high computational requirements have limited the experimental application of this method to low‐resolution outputs. Herein, the mathematical background and the experimental approach toward megapixel resolution, ultrafast compressed sensing current mapping are presented, overcoming previous computational and experimental barriers. A high‐power digital light processing projection system is developed for the experimental application. Solutions to computational issues, sampling optimization, and measurement strategies are presented and the flexibility of the system regarding the sizes of photovoltaic devices that can be measured is demonstrated.

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Implied Open‐circuit Voltage Imaging via a Single Bandpass Filter Method—Its First Application in Perovskite Solar Cells

Soufiani

Lee‐Chin

Faßl

et al. 2022

Adv Funct Materials

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A novel, camera-based method for direct implied open-circuit voltage (iV OC ) imaging via the use of a single bandpass filter (s-BPF) is developed for largearea photovoltaic solar cells and precursors. The photoluminescence (PL) emission is imaged using a narrow BPF with centre energy inside the highenergy tail of the PL emission, utilising the close-to-unity and nearly constant absorptivity of typical photovoltaic devices in this energy range. As a result, the exact value of the sample's absorptivity within the BPF transmission band is not required. The use of an s-BPF enables a fully contactless approach to calibrate the absolute PL photon flux for spectrally integrated detectors, including cameras. The method eliminates the need for knowledge of the imaging system spectral response. Through an appropriate choice of the BPF centre energy, a range of absorber compositions or a single absorber with different surface morphologies, such as planar and textured, can be imaged, all without the need for additional detection optics. The feasibility of this s-BPF method is first validated. The relative error in iV OC is determined to be ≤1.5%. The method is then demonstrated on device stacks with two different perovskite compositions commonly used in single-junction and monolithic tandem solar cells.

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Contactless and Spatially Resolved Determination of Current−Voltage Curves in Perovskite Solar Cells via Photoluminescence

Cited by 7 publications

References 0 publications

Electrical properties of perovskite solar cells by illumination intensity and temperature‐dependent photoluminescence imaging

Electrical properties of perovskite solar cells by illumination intensity and temperature‐dependent photoluminescence imaging

Toward Megapixel Resolution Compressed Sensing Current Mapping of Photovoltaic Devices Using Digital Light Processing

Implied Open‐circuit Voltage Imaging via a Single Bandpass Filter Method—Its First Application in Perovskite Solar Cells

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