Microfluidic flexible DSSCs based of UV- and thermal-cured polymeric materials

Claudio Gerbaldi^a, Elena Tresso^a, Fabrizio Pirri^a, Andrea Lamberti^a, Federico Bella^a, Stefano Bianco^a

^aPolitecnico di Torino, Italy, Corso Duca Degli Abruzi 24, Torino, 10129, Italy

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Federico Bella, 363
Publication date: 5th February 2015

One of the possible applications of dye-sensitized solar cells (DSSCs) is the biasing of low-power portable devices. However some critical issues still have to be faced in view of obtaining flexible cells, readily adaptable to complex shapes. Until today the best performing DSSCs are based on a rigid housing with glass/FTO electrodes and the use of a liquid electrolyte is crytical for the possible durability of the device. Therefore, suitable flexible electrodes and polymeric electrolytes are urgently needed. During recent years we deepened a promising approach for the fabrication of quasi-solid DSSCs with excellent long-term durability. We thoroughly studied and characterized the integration of self-standing polymeric membranes prepared by free radical photopolymerization, investigating different polymeric formulations [1]. Very recently, this electrolytic system was integrated with an innovative design for DSSC photoanode, based on the use of semitransparent metallic meshes as a support for the sensitized nanostructured semiconductor [2]. For photoanode fabrication, both the use of TiO₂ nanotubes directly grown on bendable Ti mesh by anodic oxidation and the deposition of mesoporous layers of TiO₂ nanoparticles were investigated with excellent results. The main advantage of this solution is the possibility to perform the high temperature sintering process (which is mandatory for a well performing semiconductor layer with good electron transport properties) before the integration on the final polymeric housing of the cell [3]. In this work, two flexible electrodes (a titanium mesh supporting N719-sensitized TiO₂ nanotubes by anodic oxidation and a Pt-coated mesh) are embedded in flexible PDMS substrates obtained by partial crosslink reaction before bonding. PDMS is almost totally transparent to VIS radiation down to 220 nm, thus it represents a valuable substrate for flexible DSSCs. Moreover, the two PDMS substrates can be sealed by means of UV-cured siloxane methacrylates, thus avoiding the use of thermoplastic films that would require pressure and high temperatures. Furthermore, PDMS is well suited for the fabrication of microfluidic devices [4-5], so it is possible to create holes and channels for the introduction of liquid electrolytes or UV-curable monomers containing different redox couples. The photovoltaic behavior of the resulting solid DSSCs is exhaustively investigated by electrical measurements and impedance spectroscopy. Preliminary results are definitely encouraging since efficiencies as high as 4% are obtained in bended configuration.
DSSCs fabricated by embedding flexible electrodes in PDMS supports
[1] Bella, F.; Sacco, A.; Salvador, G. P; Bianco, S.; Tresso, E.; Pirri, C. F.; Bongiovanni, R. First Pseudohalogen Polymer Electrolyte for Dye-Sensitized Solar Cells Promising for In Situ Photopolymerization. J. Phys. Chem. C 2013, 117, 20421-20430. [2] Bella, F.; Lamberti, A.; Sacco, A.; Bianco, S.; Chiodoni, A.; Bongiovanni, R. Novel electrode and electrolyte membranes: Towards flexible dye-sensitized solar cell combining vertically aligned TiO2 nanotube array and light-cured polymer network. J. Membr. Sci. 2014, 470, 125-131. [3] Lamberti, A.; Sacco, A.; Bianco, S.; Manfredi, D.; Cappelluti, F.; Hernandez, S.; Quaglio, M.; Pirri, C. F. Charge transport improvement employing TiO2 nanotube arrays as front-side illuminated dye-sensitized solar cell photoanodes. Phys. Chem. Chem. Phys. 2013, 15, 2596-2602. [4] Lamberti, A.; Sacco, A.; Bianco, S.; Giuri, E.; Quaglio, M.; Chiodoni, A.; Tresso, E. Microfluidic sealing and housing system for innovative dye-sensitized solar cell architecture. Microelectron. Eng. 2011, 88, 2308-2310. [5] Lamberti, A.; Virga, A.; Angelini, A.; Ricci, A.; Descrovi, E.; Cocuzza, M.; Giorgis, F. Metal–elastomer nanostructures for tunable SERS and easy microfluidic integration. RSC Adv. 2015, 5, 4404-4410.

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