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A wide solar spectrum light harvesting Ag2Se quantum dot-sensitized porous TiO2 nanofibers as photoanode for high-performance QDSC

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Abstract

A wide spectrum of light harvesting silver selenide (Ag2Se) quantum dots (QDs) with an average size of ~ 5 nm has been synthesized by a low-temperature one-pot hot injection method. To finely control the size of Ag2Se QDs, oleylamine was used as the solvent, and dodecanethiol was used as the capping agent as well as a stabilizer. The prepared Ag2Se QDs were ex situ sensitized on the porous TiO2 nanofiber (NF) substrate via a direct adsorption method to use as efficient photoanode for quantum dot-sensitized solar cell (QDSC). The UV-Vis-NIR absorption and photoluminescence studies revealed that Ag2Se QD-sensitized porous TiO2 NF photoanode (Ag2Se/P-TiO2) exhibited near-infrared (NIR) absorption and fast electron kinetics. Further, the QDSC fabricated using Ag2Se/P-TiO2 NFs as the photoanode, Cu2S as the counter electrode, and liquid polysulfide (S2−/Sx2− redox couple) as the electrolyte exhibited a photoconversion efficiency of 2.50% with an improved photocurrent density of 11.12 mA/cm2.

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Funding

The authors gratefully acknowledge the CSIR, New Delhi, for providing the financial support (No. 01/2810/14/EMR-II dated 24-11-2014) and the CIF Pondicherry University for providing the instrumentation facilities. One of the authors, Ms. Nisha Singh, sincerely thanks the UGC, New Delhi, for providing Research Fellowship under the RGNF scheme.

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Correspondence to Subramania Angaiah.

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Singh, N., Murugadoss, V., Rajavedhanayagam, J. et al. A wide solar spectrum light harvesting Ag2Se quantum dot-sensitized porous TiO2 nanofibers as photoanode for high-performance QDSC. J Nanopart Res 21, 176 (2019). https://doi.org/10.1007/s11051-019-4619-x

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  • DOI: https://doi.org/10.1007/s11051-019-4619-x

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