Transparent Conductive Oxide Less Flexible Dye-sensitized Solar Cells with Flat and Cylinder Shapes
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Transparent Conductive Oxide Less Flexible Dye-sensitized Solar Cells with Flat and Cylinder Shapes Jun Usagawa, Byung-wook Park, Yuhei Ogomi, Shyam S. Pandey, and Shuzi Hayase Kyushu Institute of Technology, 2-4, Hibikino, Wakamatsu-ku, Kitakyushu 808-0196 Japan ABSTRACT Transparent conductive oxide less flexible dye-sensitized solar cells (TCO-less DSC) with flat and cylinder shapes are reported. The cell consists of a plastic cover, a flexible titania/dye sheet back contacted with a metal mesh sheet, a gel electrolyte sheet, and Pt layer on a Ti sheet. How to increase the efficiency were discussed. We concluded that making a titania/dye layer on a metal mesh sheet thinner and using a thinner electrolyte layer were effective for increasing the efficiency. A flat TCO-less DSC with 6.1 % efficiency and a cylindrical TCO-less DSC with 5.1 % efficiency are reported. INTRODUCTION
Light
Porous Metal
TCO‐less DSC (back contact)
TCO
Ti sheet
Glass with TCO
Charge generation sheet Ti sheet
Light
Glass only
The certified efficiency for dye sensitized solar cell (DSCs) reached 11 % [1,2]. DSCs usually consist of transparent conductive oxide glasses (TCO-glass). TCO-glasses are still expensive now and restrict solar cell shapes. We focused on structures and fabrication process of transparent conductive oxide less DSCs (TCO-less DSCs), where porous metal electrodes are fabricated at the back side of titania/dye layers as back-contact structures as shown in Fig.1. [37]
Iodide/i odine
DSC with TCO
Fig. 1 TCO‐less DSC with back contact electrodes and conventional DSC with TCO‐ layers
We have already reported flat type, fiber type, and cylinder type dye sensitized solar cells [812]. In this report, how to optimize the structure for each cell is discussed.
EXPERIMENTAL SECTION Fabrication of flexible titania sheet (S-1): S-1 was fabricated by coating titania paste on Ticoated stainless metal mesh sheet (diameter: 25 micron), followed by heating the substrates at 450 °C. The sheet was dipped in a dye solution (N719). S-1 is a flexible charge generation sheet consisting of a titania/dye layer and a Ti-coated stainless metal mesh sheet. The surface of the Ti was oxidized to titania which blocks charge recombination between electrons in a Ti electrode and redox species in an electrolyte layer. Cross sectional view of S-1 sheet observed by SEM shows that contact between titaia layer and metal surface was good. Plastics
TiO sheet (S‐1) Gel electrolyte
Pt on Ti sheet F‐1 Fig. 2. Structure and fabrication of TCO‐less back contact flexible DSC (F‐1)
Fabrication of flexible TCO-less flat DSC (F-1): F-1 was fabricated by piling up a plastic sheet (PET sheet acting as a cover), S-1 sheet, a porous insulator layer (PTFE) containing electrolyte, and a Ti sheet with Pt. The edge was sealed with photocurable resins. Fabrication of flexible TCO-less cylinder DSC (F-2) : F-2 was fabricated by inserting porous silicone tube surrounded by a Ti metal mesh with Pt, a round shaped porous PTFE layer
Shrinkable plastic tube
Tit
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