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Synthesis and characterization of CdS nanoparticles decorated TiO2 matrix for an efficient N3 based dye sensitized solar cell (DSSC)

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Abstract

The conventional dye sensitized solar cell (DSSC) comprise of mostly the titania matrix sensitized with absorber dye molecules acting as light energy scavengers. The present investigation deals with formulating CdS–TiO2 conjugate matrix for the DSSC system using N3 dye sensitizer. TiO2 nanoparticles (NPs) were pasted on FTO glass substrate and thin film of CdS was coated on titania matrix by chemical bath deposition technique using precursors cadmium acetate and thiourea. The differential absorbance spectra of the CdS–TiO2 conjugate system shows sharp absorption edges around 345–500 nm, corresponding to band gap energies in the region 3.59 and 2.47 eV respectively, indicative of formation of two distinguishable energy region for the existence of the nano crystallites of both TiO2 and CdS. The shift in Raman bands was also observed with the incorporation of CdS in TiO2 matrix. XRD data confirms the formation of crystalline CdS nanoparticles. The FE–SEM images revealed that the TiO2 particles are spherical and monodispersed having diameter in the range 20–30 nm and embedded with CdSNPs of average particle size 10–15 nm. The performance characteristics of the synthesized films towards photovoltaic behavior were studied with the record of short circuit currents through J–V measurement using N3 absorber dye and the I−/I3 − electrolyte under 30 mW cm−2 light intensity. An effective increase of efficiency is observed with the CdS modified TiO2 matrix compared to the bare TiO2 in the DSSC system and a maximum photo-conversion efficiency of 7.5 % was obtained with the optimized dye loading. Impedance spectroscopic measurements give important information about the interfacial electron injection and recombination dynamics of the device. The incident photon-to-current conversion efficiency measurements show that both the absorbers CdS and N3 dye, contribute to the cell performance.

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Acknowledgments

The authors gratefully acknowledge Department of Science and Technology (DST-SERI) for financial support and MHRD, New Delhi, Govt. of India for the instrumental facilities provided to the Department. S. Bhattacharya thanks UGC, New Delhi for providing Junior Research Fellowship.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, West Bengal, 711 103, India

    Sayantani Bhattacharya, Arunava Pal, Atanu Jana & Jayati Datta

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  1. Sayantani Bhattacharya
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  2. Arunava Pal
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  3. Atanu Jana
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  4. Jayati Datta
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Correspondence to Jayati Datta.

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Bhattacharya, S., Pal, A., Jana, A. et al. Synthesis and characterization of CdS nanoparticles decorated TiO2 matrix for an efficient N3 based dye sensitized solar cell (DSSC). J Mater Sci: Mater Electron 27, 12438–12445 (2016). https://doi.org/10.1007/s10854-016-5298-3

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  • DOI: https://doi.org/10.1007/s10854-016-5298-3

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