Jump to main content
Jump to site search

Issue 2, 2011
Previous Article Next Article

Reduced charge recombination in a co-sensitized quantum dot solar cell with two different sizes of CdSe quantum dot

Author affiliations

Abstract

An efficient photoelectrode is fabricated by sequentially assembling 2.5 nm and 3.5 nm CdSe quantum dots (QDs) onto a TiO2 film. As revealed by UV-vis absorption spectroscopy, two sizes of CdSe QD can be effectively adsorbed on the TiO2 film. With a broader light absorption range and better coverage of CdSe QDs on the TiO2 film, a power conversion efficiency of 1.26% has been achieved for the TiO2/CdSe QD (2.5 nm)/CdSe QD (3.5 nm) cell under the illumination of one Sun (AM 1.5G, 100 mW cm−2). Electrochemical impedance spectroscopy shows that the electron lifetime for the device based on TiO2/CdSe QD (2.5 nm)/CdSe QD (3.5 nm) is longer than that for devices based on TiO2/CdSe QD (2.5 nm) and TiO2/CdSe QD (3.5 nm), indicating that the charge recombination at the interface is reduced by sensitizing with two kinds of CdSe QDs.

Graphical abstract: Reduced charge recombination in a co-sensitized quantum dot solar cell with two different sizes of CdSe quantum dot

Back to tab navigation

Publication details

The article was received on 14 Aug 2010, accepted on 01 Oct 2010 and first published on 06 Dec 2010


Article type: Paper
DOI: 10.1039/C0NR00591F
Nanoscale, 2011,3, 674-677

  •   Request permissions

    Reduced charge recombination in a co-sensitized quantum dot solar cell with two different sizes of CdSe quantum dot

    J. Chen, W. Lei and W. Q. Deng, Nanoscale, 2011, 3, 674
    DOI: 10.1039/C0NR00591F

Search articles by author

Spotlight

Advertisements