Enhanced fill factor in dye sensitized solar cells using organic co-sensitizer dyes

D. Kishore Kumar^a, Aruna Ivaturi^a, Hari M. Upadhaya^a, Laxman Gopali^b, Suman^b, S. P. Singh^b

^aHeriot-Watt University, Energy Conversion Laboratory, Institute of Mechanical Process and Energy Engineering,School of Engineering and Physical Sciences, Edimburg, Riccarton, Currie EH14 4AP, Reino Unido, United Kingdom

^bInorganic and Physical Chemistry Division, CSIR- Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500007, India

Proceedings of International Conference Solution processed Semiconductor Solar Cells (SSSC14)

Organizers: Henry Snaith and Samuel Stranks

Poster, D. Kishore Kumar, 108
Publication date: 1st July 2014

Low production cost and high photoconversion efficiency are the two key parameters in the development of third and new generation solar cells. In this regard, one of the third generation technologies which have attracted both academic and industrial interests since 1991 are the dye sensitized solar cells (DSSCs). Over the past two decades, one of the main focuses of the researchers working intensively on the DSSCs is on designing new dye molecules in combination with co-absorbers for enhancing the efficiency. In the present study, a new organic dye molecule has been developed as co-sensitizers for the enhancement of power conversion efficiencies of dye sensitized solar cells. These organic molecules show absorption peak around 460 nm. The sensitization with the organic dyes resulted in high fill factor of 80 % with Jsc = 5.8 mA/cm2, Voc = 0.59 V and photoconversion efficiency (PCE) of 2.75% for TiO2 based DSSCs with an effective area of 0.25 cm2 using iodine electrolyte. Impedance spectroscopy analysis has been carried out to understand the charge recombinations and life time of the injected electrons.

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