2D Characterization of OPV from Single and Tandem Cells to Fully Roll‐to‐Roll Processed Modules with and without Electrical Contact

Krebs, Frederik C.; Jørgensen, Mikkel

doi:10.1002/adom.201400016

Cited by 39 publications

(11 citation statements)

References 37 publications

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“…Moreover, the origin of performance improvement based on pyramid-involved hybrid cells could be further supported by the spatial characterizations with light beam induced voltage (LBIV) analysis 35 , as compared in Fig. 7(c) and (d) .…”

Section: Resultsmentioning

confidence: 80%

Hybrid black silicon solar cells textured with the interplay of copper-induced galvanic displacement

Hung

Chen

2017

Sci Rep

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Metal-assisted chemical etching (MaCE) has been widely employed for the fabrication of regular silicon (Si) nanowire arrays. These features were originated from the directional etching of Si preferentially along <100> orientations through the catalytic assistance of metals, which could be gold, silver, platinum or palladium. In this study, the dramatic modulation of etching profiles toward pyramidal architectures was undertaken by utilizing copper as catalysts through a facile one-step etching process, which paved the exceptional way on the texturization of Si for advanced photovoltaic applications. Detailed examinations of morphological evolutions, etching kinetics and formation mechanism were performed, validating the distinct etching model on Si contributed from cycling reactions of copper deposition and dissolution under a quasi-stable balance. In addition, impacts of surface texturization on the photovoltaic performance of organic/inorganic hybrid solar cells were revealed through the spatial characterizations of voltage fluctuations upon light mapping analysis. It was found that the pyramidal textures made by copper-induced cycling reactions exhibited the sound antireflection characteristics, and further achieved the leading conversion efficiency of 10.7%, approximately 1.8 times and beyond 1.2 times greater than that of untexturized and nanowire-based solar cells, respectively.

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Section: Resultsmentioning

confidence: 80%

Hybrid black silicon solar cells textured with the interplay of copper-induced galvanic displacement

Hung

Chen

2017

Sci Rep

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“…Light beam induced current (LBIC) imaging has been demonstrated as a versatile method for identifying processing defects in cells and modules by spatially resolving the photocurrent generation and collection. − In the present contribution, we use LBIC to probe photocurrent nonuniformities in the individual subcells of perovskite/Si tandem solar cells. By using laser light at different wavelengths in combination with background light bias, we can identify processing defects and efficiency-limiting regions and provide in-depth quantitative analysis of current generation and transport in the individual subcells.…”

mentioning

confidence: 99%

Probing Photocurrent Nonuniformities in the Subcells of Monolithic Perovskite/Silicon Tandem Solar Cells

Song

Werner

Shrestha

et al. 2016

J. Phys. Chem. Lett.

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Perovskite/silicon tandem solar cells with high power conversion efficiencies have the potential to become a commercially viable photovoltaic option in the near future. However, device design and optimization is challenging because conventional characterization methods do not give clear feedback on the localized chemical and physical factors that limit performance within individual subcells, especially when stability and degradation is a concern. In this study, we use light beam induced current (LBIC) to probe photocurrent collection nonuniformities in the individual subcells of perovskite/silicon tandems. The choices of lasers and light biasing conditions allow efficiency-limiting effects relating to processing defects, optical interference within the individual cells, and the evolution of water-induced device degradation to be spatially resolved. The results reveal several types of microscopic defects and demonstrate that eliminating these and managing the optical properties within the multilayer structures will be important for future optimization of perovskite/silicon tandem solar cells.

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“…However, already at the research stage the coating processes quickly produces so large volumes that high speed automatized characterization methods are necessary [105]. Polymer solar cell modules are commonly coated in a configuration with subcell stripes monolithically series connected as illustrated in Figure 6.6.…”

Section: Imaging Of Modulesmentioning

confidence: 99%

“…LBIC can be operated at high speeds with a mirror galvanometer to sweep the large area solar cells is two dimensions rendering a photocurrent image [109]. Krebs and Jörgensen introduced a rotating mirrors LBIC for R2R in-line measurements where the laser is scanned over the web [105]. In this work they further introduce an elegant capacitive contact by using two metal plates at the module edges overlapping the current collecting busbars in the solar module.…”

Section: Imaging Of Modulesmentioning

confidence: 99%

Optoelectrical Imaging Methods for Organic Photovoltaic Materials and Moduls

Bergqvist¹

2015

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Linköping 2015 IICover image: LED array based photocurrent imaging method for in-line characterization of printed organic solar cells developed during the course of this thesis. Illustration by Cecilia Kornehed.During the course of research underlying this thesis, Jonas Bergqvist was enrolled in Agora Materiae, a multidisciplinary doctoral program at Linköping University, Sweden. III AbstractTo achieve a high living standard for all people on Earth access to low cost energy is essential. The massive burning of fossil fuels must be drastically reduced if we are to avoid large changes of our climate. Solar cells are both technologically mature and have the potential to meet the huge demand for renewable energy in many countries. The prices for silicon solar cells have decreased rapidly during the course of this thesis and are now in grid parity in many countries.However, the potential for even lower energy costs has driven the research on polymer solar cells, a class of thin film solar cells. Polymer solar cells can be produced by roll to roll printing which potentially enables truly low cost solar cells. However, much research and development remain to reach that target.Polymer solar cells consist of a semiconducting composite material sandwiched between two electrodes, of which one is transparent, to let the light energy in to the semiconductor where it is converted to electric energy. The semiconductor comprise an intimate blend of polymer and fullerenes, where the nanostructure of this blend is crucial for the photo current extraction.To reach higher solar cell performance the dominating strategy is development and fine tuning of new polymers. To estimate their potential as solar cell materials their optical response have been determined by spectroscopic ellipsometry. Furthermore, optical simulations have been performed where the direction dependency of the optical response of the transparent electrode material PEDOT:PSS have been accounted for. The simulations show reduced electrode losses for light incident at large oblique angles.Moreover, we have shown that a gentle annealing of the active layer induces a local conformational changes of an amorphous polymer that is beneficial for solar cell performance. The active layer is deposited from solution where the drying kinetics determine the final nanostructure. We have shown that using in-situ photoluminescence phase separation can be detected during the drying process while a reflectance method have been developed to image lateral variations of solvent evaporation rate.Imaging methods are important tools to detect performance variations over the solar cell area. For this purpose an intermodulation based photo current imaging method have been developed to qualitatively differentiate the major photo current loss mechanisms. In addition, a 1D LED-array photo current imaging method have been developed and verified for high speed in-line characterization of printed organic solar modules. IV Populärvetenskaplig sammanfattningFör att uppnå en hög levnadsstandard för...

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2D Characterization of OPV from Single and Tandem Cells to Fully Roll‐to‐Roll Processed Modules with and without Electrical Contact

Cited by 39 publications

References 37 publications

Hybrid black silicon solar cells textured with the interplay of copper-induced galvanic displacement

Hybrid black silicon solar cells textured with the interplay of copper-induced galvanic displacement

Probing Photocurrent Nonuniformities in the Subcells of Monolithic Perovskite/Silicon Tandem Solar Cells

Optoelectrical Imaging Methods for Organic Photovoltaic Materials and Moduls

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