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

G. D. Sharma, Surya Prakash Singh, Rajnish Kurchania, R. J. Ball

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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 (J sc) 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 I 3 -/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.
LanguageEnglish
Pages6036-6043
Number of pages8
JournalRSC Advances
Volume3
Issue number17
DOIs
StatusPublished - 1 Jan 2013

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Coloring Agents
Dyes
Metals
Conversion efficiency
Electrolytes
thiocyanate
Dye-sensitized solar cells
Electrons
Dark currents
Open circuit voltage
Current voltage characteristics
Conduction bands
Short circuit currents
Light absorption
Agglomeration

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Cosensitization of dye sensitized solar cells with a thiocyanate free Ru dye and a metal free dye containing thienylfluorene conjugation. / Sharma, G. D.; Singh, Surya Prakash; Kurchania, Rajnish; Ball, R. J.

In: RSC Advances, Vol. 3, No. 17, 01.01.2013, p. 6036-6043.

Research output: Contribution to journalArticle

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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 (J sc) 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 I 3 -/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.",
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