A wide solar spectrum light harvesting Ag2Se quantum dot-sensitized porous TiO2 nanofibers as photoanode for high-performance QDSC
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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.
KeywordsElectrospinning Ag2Se quantum dots TiO2 nanofibers Quantum dot-sensitized solar cell
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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Conflict of interest
The authors declare that they have no conflicts of interest.
- Cao Q, Cheng Y-F, Bi H, Zhao X, Yuan K, Liu Q, Li Q, Wang M, Che R (2015) Crystal defect-mediated band-gap engineering: a new strategy for tuning the optical properties of Ag2Se quantum dots toward enhanced hydrogen evolution performance. J Mater Chem A 3:20051–20055. https://doi.org/10.1039/C5TA04978D CrossRefGoogle Scholar
- Kouhnavard M, Ikeda S, Ludin NA, Ahmad Khairudin NB, Ghaffari BV, Mat-Teridi MA, Ibrahim MA, Sepeai S, Sopian K (2014) A review of semiconductor materials as sensitizers for quantum dot-sensitized solar cells. Renew Sust Energ Rev 37:397–407. https://doi.org/10.1016/j.rser.2014.05.023 CrossRefGoogle Scholar
- Subramania A, Vijayakumar E, Pratheep P, Sivasankar N, Karthick SN (2015) Influence of PVP template on the formation of porous TiO2 nanofibers by electrospinning technique for dye-sensitized solar cell. Appl Phys A Mater Sci Process 120:1211–1218. https://doi.org/10.1007/s00339-015-9306-x CrossRefGoogle Scholar
- Xing B, Li W, Dou H et al (2008) Systematic study of the properties of CdSe quantum dots synthesized in paraffin liquid with potential application in multiplexed bioassays. JPhysChemC 112:14318–14323Google Scholar