Issue 17, 2013
From the journal:

RSC Advances

Cosensitization of dye sensitized solar cells with a thiocyanate free Ru dye and a metal free dye containing thienylfluorene conjugation

G. D. Sharma,*a   Surya Prakash Singh,b   Rajnish Kurchaniac  and  R. J. Balld  

* Corresponding authors

a R & D center for Engineering and Science JEC Group of Colleges, Jaipur Engineering College campus Kukas, Jaipur (Raj.) 303101, India
E-mail: sharmagd_in@yahoo.com, gdsharma273@gmail.com

b Inorganic and Physical Chemistry Division, CSIR – Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad, India

c Department of Physics, Maulana Azad National Institute of Technology (MANIT), Bhopal 462051, (MP), India

d Department of Architecture and Civil Engineering, University of Bath, Bath, BA2 7AY, UK

Abstract

A stepwise approach has been applied for the cosensitization of a thiocyanate free Ru sensitizer (SPS-01) with a metal free dye containing thienylfluorene conjugation (JD1) for dye sensitized solar cells (DSSCs). The cosensitized SPS-01 + JD1 based DSSC showed a significant enhancement in both the open circuit voltage (Voc) and the short circuit current (Jsc) relative to the individual single dye based DSSCs. The DSSC based on the SPS-01 + JD1 system yielded a Jsc of 15.38 mA cm−2, a Voc of 0.72 V, a fill factor (FF) of 0.76 and a power conversion efficiency (PCE) of 8.30%. This performance was superior to that of the DSSCs sensitized with the individual dyes SPS-01 (PCE = 5.98%) or JD1 (PCE = 4.76%) fabricated under the same conditions. Results show that the JD1 dye effectively overcomes the competitive light absorption by I3−/I− and also prevents dye aggregation and reduces the charge recombination. To understand the effects of the charge recombination of the injected electrons with I3− in the electrolyte, the dark current–voltage characteristics and electrochemical impedance spectra of the DSSCs sensitized with the SPS-01 and SPS-01+JD1 systems were measured. It was observed that the recombination of the electrons in the conduction band with I3− in the electrolyte in the DSSC sensitized with SPS-01 +JD1 was significantly reduced relative to the DSSC based on SPS-01.

Graphical abstract: Cosensitization of dye sensitized solar cells with a thiocyanate free Ru dye and a metal free dye containing thienylfluorene conjugation

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Article information

DOI
https://doi.org/10.1039/C3RA23155K
Article type
Paper
Submitted
04 Dec 2012
Accepted
12 Feb 2013
First published
12 Feb 2013

RSC Adv., 2013,3, 6036-6043

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Cosensitization of dye sensitized solar cells with a thiocyanate free Ru dye and a metal free dye containing thienylfluorene conjugation

G. D. Sharma, S. P. Singh, R. Kurchania and R. J. Ball, RSC Adv., 2013, 3, 6036 DOI: 10.1039/C3RA23155K

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