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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 271 C133 - Photocapacitors based on solid state dye solar cells and metal oxide chargestorage materials Katarzyna Grzejszczyk b , Anders Hagfeldt a , Leif Häggman a , Erik Johansson a , Pawel Kulesza b , Magdalena Skunik b , Nick Vlachopoulos *a , Lei Yang a Diminishing reserves of fossil fuels as well as their high prices and their damaging effect on the environment force the intense development of alternative, environmentally friendly sources of energy. Therefore in recent years there is a growing interest in solar-energy conversion by photovoltaic cells which convert sunlight directly into electricity. However the intermittent nature of sunlight availability requires another device in conjunction with solar cell to storage of produced electricity. One important option is electrochemical storage by means of a secondary battery, where energy is stored inside the cell, or an electrolysis cell, where the products, usually hydrogen and oxygen, are externally stored [1]. Here we present a novel, interesting approach which is the direct storage of electric energy generated by light in high power, photo-rechargeable electrochemical supercapacitor (photocapacitor) integrated with a dye-sensitized solar cell (DSC) as one device. A threeelectrode configuration whose concept was firstly proposed by Miyasaka [1] will be considered here, where bipolar electrode separates a solid-state solar cell and a supercapacitor element. An organic charge-transfer dye chemisorbed on a mesoporous TiO2 electrode is in contact with a poly(3-hexylthiophene) (P3HT) conducting polymer layer; the intermediate (bipolar) electrode is an evaporated Ag layer, which also serves as a support for one of the charge– storage layers. Figure 1 Three-electrode photocapacitor. The charge-storage supercapacitor layers on the intermediate electrode and the counterelectrode consist of ruthenium oxide separated by a proton-conducting polymer layer. Those materials are first examined in a symmetrical capacitor configuration by various electrochemical techniques. Then they are incorporated into a DSC-supercapacitor cell and exposed to AM1.5 simulated white light. Charging voltage, specific capacitance and energy © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 272 storage efficiency for a complete photocharge-dark discharge cycle under constant current have been obtained. References [1] Murakami, T.N.; Kawashima, N.;, Miyasaka, T. "A high-voltage dye-sensitized photocapacitor of a three-electrode system" Chem. Comm. 3346-3348, (2005) © SEFIN 2012
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