Journal article

Supersensitization of CdS quantum dots with a near-infrared organic dye: Toward the design of panchromatic hybrid-sensitized solar cells

Choi H, Nicolaescu R, Paek S, Ko J, Kamat P ...see all

ACS Nano, vol. 5, issue 11 (2011) pp. 9238-9245

  • 95

    Readers

    Mendeley users who have this article in their library.
  • 96

    Citations

    Citations of this article.
Sign in to save reference

Abstract

The photoresponse of quantum dot solar cells (QDSCs) has been successfully extended to the near-IR (NIR) region by sensitizing nanostructured TiO(2)-CdS films with a squaraine dye (JK-216). CdS nanoparticles anchored on mesoscopic TiO(2) films obtained by successive ionic layer adsorption and reaction (SILAR) exhibit limited absorption below 500 nm with a net power conversion efficiency of ~1% when employed as a photoanode in QDSC. By depositing a thin barrier layer of Al(2)O(3), the TiO(2)-CdS films were further modified with a NIR absorbing squaraine dye. Quantum dot sensitized solar cells supersensitized with a squariand dye (JK-216) showed good stability during illumination with standard global AM 1.5 solar conditions, delivering a maximum overall power conversion efficiency (eta) of 3.14%. Transient absorption and pulse radiolysis measurements provide further insight into the excited state interactions of squaraine dye with SiO(2), TiO(2), and TiO(2)/CdS/Al(2)O(3) films and interfacial electron transfer processes. The synergy of combining semiconductor quantum dots and NIR absorbing dye provides new opportunities to harvest photons from different regions of the solar spectrum.

Author-supplied keywords

  • CdS
  • photocurrent generation
  • photosensitization
  • pulse radiolysis
  • quantum dot solar cells
  • squaraine dye
  • transient absorption spectroscopy

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text

Authors

  • Hyunbong Choi

  • Roxana Nicolaescu

  • Sanghyun Paek

  • Jaejung Ko

  • Prashant V. Kamat

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free