Trichromatic High Resolution-LBIC: A System for the Micrometric Characterization of Solar Cells

Navas, Javier; Alcántara, Rodrigo; Fernández‐Lorenzo, Concha; Martín‐Calleja, Joaquin

doi:10.5772/19542

Cited by 3 publications

(9 citation statements)

References 19 publications

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“…From this curve, the values for the short-circuit current density (J SC ), open-circuit voltage (V OC ), fill factor (FF), and photoconversion efficiency (PCE) were obtained ( Table 1). The PCE of previous DSSCs using MK-2 was reported to be 6-8% [16][17][18]. In contrast, the PCE value of the MK-2-DSSC prepared for LSM was extremely small because the TiO 2 layer was much thinner in this cell than in conventional DSSCs, whose film thicknesses are typically 5-10 µm.…”

Section: Laser Scanning Microscopy (Lsm) Measurementsmentioning

confidence: 86%

“…The lateral resolution of the PC and PL measurements conducted using our LSM is ca. 200 nm, which is approximately an order of magnitude smaller than that described in previous studies using the light beam induced current technique [15][16][17][18][19]. As shown in Figure 1b, photocurrent measurements of the DSSCs were conducted at short-circuit using a picoammeter (6487, Keithley Instruments, Cleveland, OH, USA).…”

Section: Laser Scanning Microscopy (Lsm) Measurementsmentioning

confidence: 98%

“…This setup provides a spatial resolution of ca. 200 nm, which is by a factor of 10 times better than that described in previous reports [15][16][17][18][19]. Using this setup, we evaluated photovoltaic parameters such as short-circuit current density (Jsc) and open-circuit voltage (Voc) for a local area of the DSSCs.…”

Section: Introductionmentioning

confidence: 98%

“…Laser scanning microscopy (LSM) probing PC is a spatially resolved characterization technique that has been used for the investigation of DSSCs [15][16][17][18][19]. As shown in Figure 1a, we fabricated a DSSC comprising a cover glass photoanode with a 100-nm thick TiO2 layer, which allows analyzing the DSSC devices using an oil-immersion objective lens with a high numerical aperture (N.A.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy

2020

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Photoconversion processes such as electron injection (photooxidation) and dye regeneration (reduction) in dye-sensitized solar cells (DSSCs) occur at considerably inhomogeneous semiconductor/dye/electrolyte interfaces, implying a very high heterogeneity of interfacial photoconversion kinetics. Herein, we present a temporally and spatially resolved investigation of DSSCs comprising a cover glass photoanode with a 100-nm thick TiO2 layer loaded with the metal-free organic dye sensitizer MK-2, which is performed by employing laser scanning microscopy (LSM) for the simultaneous measurement of the photocurrent (PC) and photoluminescence (PL) of DSSCs under short-circuit conditions. Analysis of PL decay curves and the excitation rate dependences of PC and PL obtained for local (or submicrometric) areas of the MK-2-DSSC allows disclosing and quantifying three types of dyes coexisting in the DSSCs: (i) a dye that only generates PC (“PC-dye,” 75% of total dye molecules in the DSSC), (ii) a dye that generates both PC and PL (“PCPL-dye,” 20%), and (iii) a dye that only generates PL (“PL-dye,” 5%). Considering recent theoretical reports on cyanoacrylic dyes, we propose that the PC-dye and the PCPL-dye are covalently bound on a TiO2 surface with different adsorption modes (presumably bidentate and tridentate bridging configurations), whereas the PL-dye is noncovalently trapped within a mesoporous TiO2 film.

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Section: Laser Scanning Microscopy (Lsm) Measurementsmentioning

confidence: 86%

Section: Laser Scanning Microscopy (Lsm) Measurementsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy

2020

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“…One should ensure that the injection distribution around the laser spot is identical (at least similar) to the one induced by uniform illumination used in operating conditions. While this can be achieved by using bias light [4] illuminating uniformly around the lasers spot, this method induces a large dc current [4,5] that is difficult to cope with and might be additionally technically difficult to implement in high resolution LBIC (HR-LBIC) systems because of the small focal length of the laser focusing lens [6,7].…”

mentioning

confidence: 99%

Injection in light beam induced current systems: An analytical model

Micard

Hahn

Terheiden

2016

Physica Status Solidi (a)

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In LBIC systems, the evaluation of the injection level is necessary when operating in low injection for defect recombination studies or in defined standard illumination conditions (one or several suns for concentrator applications) for quantum efficiency evaluation. We demonstrate in this contribution that evaluating the laser beam induced injection based on uniform illumination condition can lead to several decades of error because of the lateral carrier diffusion. Based on a parallel beam approximation, we propose here an analytical model to evaluate the maximum of injection of a laser with its parametrization valid for most LBIC system settings and material quality. State of the art high resolution LBIC (HR‐LBIC) systems have so sharply focused laser beams that the beam divergence cannot be neglected anymore in the injection calculation. Although providing a quantitative criterion to determine whether the beam divergence can be neglected, we provide a more advanced model for describing the injection of the laser that includes beam divergence.

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Correlations between Photovoltaic Characteristics, Adsorption Number, and Regeneration Kinetics in Dye-Sensitized Solar Cells Revealed by Scanning Photocurrent Microscopy

et al. 2015

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Newly developed simultaneous scanning photocurrent and luminescence microscopy was applied to ruthenium-based dye-sensitized solar cells (DSCs) comprising a cover glass photoanode with a 100 nm thick TiO2 layer. Using this, we have investigated the lateral variations of several parameters of these DSCs under short-circuit conditions. Simultaneous measurement of photocurrent and luminescence images for the same area of the DSC demonstrated submicrometric lateral resolution of our photocurrent microscopy, which is approximately 10 times better than the resolution of photocurrent microscopy used in past studies. The photovoltaic parameters, such as short-circuit current density, open-circuit voltage, and charge-collection efficiency, were thus evaluated for local (or submicrometric) regions of the DSCs. Furthermore, the photocurrent saturation behavior of the DSCs was examined as a function of the excitation rate and analyzed on the basis of a three-state kinetic model. This protocol allowed for quantification of the dye-adsorption number and dye-regeneration rate constant for any local area of the DSCs. Consequently, the correlations between the dye adsorption number, photovoltaic parameters, and regeneration rate constant, which are difficult to address through examination of the entire cell, were revealed by the "zoom-in" approach utilizing this high-resolution photocurrent microscopy.

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Trichromatic High Resolution-LBIC: A System for the Micrometric Characterization of Solar Cells

Cited by 3 publications

References 19 publications

Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy

Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy

Injection in light beam induced current systems: An analytical model

Correlations between Photovoltaic Characteristics, Adsorption Number, and Regeneration Kinetics in Dye-Sensitized Solar Cells Revealed by Scanning Photocurrent Microscopy

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