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Size Dependent Electron Transfer from CdTe Quantum Dots Linked to TiO 2 Thin Films in Quantum dot Sensitized Solar Cells

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : Materials Chemistry and Physics

Source : Materials Chemistry and Physics, Volume 141, Number 1, p.216-222 (2013)

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Keywords : Band edge position, Cadmium telluride, Cdte quantum dots (QDs), Charge transfer, Conduction band offset, Electrochemical properties, IV characteristics, Mercaptopropionic acid, Optical materials, Quantum dot-sensitized solar cells, Rate constants, Semiconductor materials, Semiconductor quantum dots, Sensitized solar cells, Solar cells, Substrates, Time-resolved emissions, Titanium dioxide

Campus : Kochi

School : Center for Nanosciences

Center : Amrita Center for Nanosciences and Molecular Medicine Move, Nanosciences

Department : Nanosciences

Year : 2013

Abstract : In this present study, we demonstrate the size dependent charge transfer from CdTe quantum dots (QDs) into TiO2 substrate and relate this charge transfer to the actual behavior of a CdTe sensitized solar cell. CdTe QDs was synthesized using mercaptopropionic acid as the capping agent. The conduction band offset for TiO2 and CdTe QDs indicates thermodynamically favorable band edge positions for smaller QDs for the electron-transfer at the QD-TiO2 interface. Time-resolved emission studies were carried out for CdTe QD on glass and CdTe QD on TiO2 substrates. Results on the quenching of QD luminescence, which relates to the transfer kinetics of electrons from the QD to the TiO2 film, showed that at the smaller QD sizes the transfer kinetics are much more rapid than at the larger sizes. I-V characteristics of quantum dot sensitized solar cells (QDSSC) with different sized QDs were also investigated indicating higher current densities at smaller QD sizes consistent with the charge transfer results. The maximum injection rate constant and photocurrent were obtained for 2.5 nm CdTe QDs. We have been able to construct a solar cell with reasonable characteristics

Cite this Research Publication : P. Lekha, Balakrishnan, A., Subramanian, K. R. V., and Shantikumar V Nair, “Size Dependent Electron Transfer from CdTe Quantum Dots Linked to TiO 2 Thin Films in Quantum dot Sensitized Solar Cells”, Materials Chemistry and Physics, vol. 141, pp. 216-222, 2013.

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