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Large area hole transporter deposition in efficient solid-state dye-sensitized solar cell mini-modules
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic showing the cross section of a mini-module. The Spiro-OMeTAD capping layer is defined as the material between the top of the mesoporous metal oxides and the bottom of the silver cathode. AlO was added to block possible shorting paths between the silver and TiO. Other components in the solar cell are labelled. (b) Diagram to illustrate the process of doctor-blading. Spiro-OMeTAD solution is deposited onto the prepared photoanode just in front of a bar or blade. The bar is pushed across the rest of the mesoporous structure held at a defined height by supports either side of the substrate (from right to left in figure above). A reservoir of solution ahead of the bar provides material to wet and fill the mesopores, with the bar leaving a smooth film in its wake.

Image of FIG. 2.
FIG. 2.

Solar cell performance parameters for ∼8 cm2 two cell mini-modules. Parameters plotted as a function of substrate temperature during doctor blade deposition of Spiro-OMeTAD, measured under simulated AM 1.5 100 mW cm−2 illumination at room temperature: (a) open-circuit voltage (V); (b) short-circuit current density (J); (c) PCE; (d) FF; (e) current-voltage curves for the best performing mini-module under illumination (black squares) and in the dark (grey triangles). We note that the active area of the mini-modules was defined by the overlap of the metal electrodes and FTO, and not by a non-transparent optical mask as would be the ideal method. We note that edge effects are likely to introduce a slight overestimation in the photocurrent, though considerably less in this large cell configuration than the 14% increase reported for small area (0.12 cm2) solid-state DSSCs, but should still be considered when comparing absolute values. 17

Image of FIG. 3.
FIG. 3.

(a) Example transmission spectra for TiO film before coating with Spiro-OMeTAD showing Fresnel interference fringes. (b) Average effective refractive index , and pore-filling fraction PFF. (calculated as defined by Docampo 15 ) and PFF (the volume fraction of mesoporous TiO infiltrated by Spiro-OMeTAD) are shown here as a function of substrate temperature during deposition.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Large area hole transporter deposition in efficient solid-state dye-sensitized solar cell mini-modules