PEDOT:PSS doped with graphene nanopellets fabricated through screen printing at low temperature for Flexible DSSC

David Gutiérrez-Tauste^a, Mónica Della Pirriera^a, Ana Milena Cruz^a, Meritxell Berenguer-Mairal^a, Pau Bosch-Jimenez^a

^aAcondicionamiento Tarrasense, carrer de la Innovacio 2, Terrasa, 08225

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, Pau Bosch-Jimenez, 407
Publication date: 5th February 2015

The typically material used at DSSC cathodes is platinum. The platinum is the most used material because its high catalytic activity which led high cell efficiencies. However this material is highly expensive and it is commonly deposited from chloroplatinic acid hexahydrate (H₂PtCl₆·6H₂O) based inks and sintered at high temperature (450ºC) which it does not allow the use of flexible polymeric substrates. Although, platinum can be deposited onto plastic substrates using sputtering, however these techniques require large waste of energy. PEDOT:PSS is the most used material to overcome the commented drawbacks of platinum, and obtain semitransparent counter electrodes. However that material present lower catalytic activity. For this reason, here, the use of PEDOT:PSS doped with graphene nanopellets is studied to increase the performance of screen printed and low temperature processed cathode; which allow the use of polymeric substrates and low energy cost processing.< PEDOT: PSS Ph500 from HERAEUS was used as precursors to make the screen printing paste. Proper volume of ethylene Glycol was added, and then the mixture is put into rotoevaporator up to obtain a optimum viscosity, finally graphene nanopellets and surfactant were added.The PEDOT:PSS with and without carbon catalyst pastes are deposited with screen printing (43T mesh). The cells fabricated with PEDOT:PSS counter electrodes have less efficiency that cells fabricated using platinum materials (8.6%). The lower efficiency is mainly due lower FF, which is coherent with lower catalytic activity of PEDOT:PSS respect to platinum based counter electrodes. However, doping the PEDOT:PSS paste with graphene increase the efficiency around 29 % (close to 4%) respect undoped paste. Moreover, the PEDOT:PSS have been deposited through printing techniques and processed using low temperature, and that means that the economical cost and energetic cost can be lower. Currently, the cost of 1 Kg of commercial platinum paste for high temperature processing is close to 1000 €/kg, and we have calculated that the cost of PEDOT:PSS paste can be lower than 250 €/kg

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